2010 Cadillac Truck SRX FWD V6-3.0L Page 922

2010 Cadillac Truck SRX FWD V6-3.0L Page 922

瀚慖f the test lamp illuminates, test the low control circuit for a short to ground. If the circuit tests normal, replace the K20 ECM.

3. Ignition ON, verify that a test lamp does not illuminate between ground and the high control circuit terminal 2.

瀚慖f the test lamp illuminates, test the high control circuit for a short to voltage. If the circuit tests normal, replace the K20 ECM.

4. Ignition ON, command the Fuel Pressure Regulator ON with a scan tool. Verify that the test lamp illuminates.

瀚慖f the test lamp does not illuminate, test the high control circuit for a short to ground or an open/high resistance. If the circuit tests normal,

replace the K20 ECM.

5. Ignition OFF, connect a test lamp between the low control circuit terminal 1 and B+.

6. Ignition ON, command the Fuel Pressure Regulator ON with a scan tool. Verify that the test lamp illuminates.

瀚慖f the test lamp does not illuminate, test the low control circuit for a short to voltage or an open/high resistance. If the circuit tests normal,

replace the K20 ECM.

7. If all circuits test normal, test or replace the G18 high pressure fuel pump.

Component Testing

Static Test

1. Ignition OFF, disconnect the harness connector at the G18 high pressure fuel pump.

Note: The DMM and test leads must be calibrated to 0 ohm in order to prevent misdiagnosis.

2. Test for 9-11 ohm at 25掳C (77掳F) between the low control circuit terminal 1 and the high control circuit terminal 2.

瀚慖f not within the specified range, replace the G18 high pressure fuel pump.

3. Measure the resistance between each terminal and the high pressure fuel pump housing. The DMM should display OL.

瀚慖f less than the specified value, replace the G18 high pressure fuel pump.

Repair Instructions

Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.

* Fuel Pump Replacement (See: Powertrain Management/Fuel Delivery and Air Induction/Fuel Pump/Service and Repair/Fuel Pump

Replacement)

* Control Module References (See: Testing and Inspection/Programming and Relearning) for ECM replacement, setup, and programming

P00C9

DTC P0090-P0092, P00C8, P00C9, or P00CA (LF1, LFW)

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System

Check - Vehicle) prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an

overview of the diagnostic approach.

* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure

Instructions) provides an overview of each diagnostic category.

DTC Descriptors

DTC P0090

- Fuel Pressure Regulator Control Circuit

DTC P0091

- Fuel Pressure Regulator Control Circuit Low Voltage

DTC P0092

- Fuel Pressure Regulator Control Circuit High Voltage

DTC P00C8

- Fuel Pressure Regulator High Control Circuit

2010 Cadillac CTS Sedan AWD V6-3.6L Page 568

2010 Cadillac CTS Sedan AWD V6-3.6L Page 568

瀚慖f the test lamp illuminates, test the appropriate signal circuit for a short to voltage.

6. Ignition OFF, test for infinite resistance between the following circuits and ground:

* Signal circuit terminal B

* Signal circuit terminal C

瀚慖f less than the specified value, test the appropriate signal circuit for a short to ground.

7. Test for less than 2 ohms between the following signal circuits:

* Terminal B at the RCDLR and terminal 3 at the console active antenna

* Terminal C at the RCDLR and terminal 4 at the console active antenna

瀚慖f greater than the specified range, test the appropriate signal circuit for an open/high resistance.

8. If all circuits test normal, test or replace the console active antenna.

Repair Instructions

Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.

* Ignition Lock Key Transmitter Antenna Replacement - Floor Console (Passive) (See: Accessories and Optional Equipment/Antitheft and

Alarm Systems/Keyless Entry/Antenna - Keyless Entry/Service and Repair/Ignition Lock Key Transmitter Antenna Replacement - Floor

Console (Passive))Ignition Lock Key Transmitter Antenna Replacement - Floor Console (Active) (See: Accessories and Optional

Equipment/Antitheft and Alarm Systems/Keyless Entry/Antenna - Keyless Entry/Service and Repair/Ignition Lock Key Transmitter Antenna

Replacement - Floor Console (Active))

* Control Module References (See: Testing and Inspection/Programming and Relearning) for RCDLR replacement, setup, and programming

B3123

DTC B3123

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System

Check - Vehicle) prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an

overview of the diagnostic approach.

* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure

Instructions) provides an overview of each diagnostic category.

DTC Descriptors

DTC B3123 00

- Keyless Entry Antenna 5 Performance - Console Passive Antenna

Diagnostic Fault Information

2010 Cadillac Truck SRX AWD V6-3.0L Page 922

2010 Cadillac Truck SRX AWD V6-3.0L Page 922

瀚慖f the test lamp illuminates, test the low control circuit for a short to ground. If the circuit tests normal, replace the K20 ECM.

3. Ignition ON, verify that a test lamp does not illuminate between ground and the high control circuit terminal 2.

瀚慖f the test lamp illuminates, test the high control circuit for a short to voltage. If the circuit tests normal, replace the K20 ECM.

4. Ignition ON, command the Fuel Pressure Regulator ON with a scan tool. Verify that the test lamp illuminates.

瀚慖f the test lamp does not illuminate, test the high control circuit for a short to ground or an open/high resistance. If the circuit tests normal,

replace the K20 ECM.

5. Ignition OFF, connect a test lamp between the low control circuit terminal 1 and B+.

6. Ignition ON, command the Fuel Pressure Regulator ON with a scan tool. Verify that the test lamp illuminates.

瀚慖f the test lamp does not illuminate, test the low control circuit for a short to voltage or an open/high resistance. If the circuit tests normal,

replace the K20 ECM.

7. If all circuits test normal, test or replace the G18 high pressure fuel pump.

Component Testing

Static Test

1. Ignition OFF, disconnect the harness connector at the G18 high pressure fuel pump.

Note: The DMM and test leads must be calibrated to 0 ohm in order to prevent misdiagnosis.

2. Test for 9-11 ohm at 25掳C (77掳F) between the low control circuit terminal 1 and the high control circuit terminal 2.

瀚慖f not within the specified range, replace the G18 high pressure fuel pump.

3. Measure the resistance between each terminal and the high pressure fuel pump housing. The DMM should display OL.

瀚慖f less than the specified value, replace the G18 high pressure fuel pump.

Repair Instructions

Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.

* Fuel Pump Replacement (See: Powertrain Management/Fuel Delivery and Air Induction/Fuel Pump/Service and Repair/Fuel Pump

Replacement)

* Control Module References (See: Testing and Inspection/Programming and Relearning) for ECM replacement, setup, and programming

P00C9

DTC P0090-P0092, P00C8, P00C9, or P00CA (LF1, LFW)

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System

Check - Vehicle) prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an

overview of the diagnostic approach.

* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure

Instructions) provides an overview of each diagnostic category.

DTC Descriptors

DTC P0090

- Fuel Pressure Regulator Control Circuit

DTC P0091

- Fuel Pressure Regulator Control Circuit Low Voltage

DTC P0092

- Fuel Pressure Regulator Control Circuit High Voltage

DTC P00C8

- Fuel Pressure Regulator High Control Circuit

2010 Cadillac CTS Sedan AWD V6-3.0L Page 1583

2010 Cadillac CTS Sedan AWD V6-3.0L Page 1583

瀚慖f the test lamp illuminates, test the control circuit for a short to ground. If the circuit tests normal, replace the K20 ECM.

7. Connect a DMM set to the diode setting between the control circuit terminal 86 and ground.

8. Ignition ON, verify the DMM does not display OL.

瀚慖f the DMM displays OL, test the control circuit for a short to voltage, or an open/high resistance. If the circuit tests normal, replace the

K20 ECM.

9. If all circuits test normal, replace the KR75 powertrain relay.

Component Testing

Note: Depending on the application, the relay coil resistance will be within one of the following ranges.

1. Test for one of the following resistance specifications between terminals 85 and 86 of the KR75 powertrain relay:

* 70-110 ohm

* 200-250 ohm

瀚慖f not within the specified range, replace the KR75 powertrain relay.

2. Measure for infinite resistance between the following terminals of the KR75 powertrain relay:

* 30 and 86

* 30 and 87

* 30 and 85

* 85 and 87

瀚慖f continuity is detected, replace the KR75 powertrain relay.

3. Connect a 20 A fused jumper wire from the positive terminal of the battery to relay terminal 85. Connect a jumper wire from the negative

terminal of the battery to relay terminal 86. Measure for less than 2 Ohms between terminals 30 and 87 of the relay.

瀚慖f greater than the specified value, replace the KR75 powertrain relay.

Repair Instructions

Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.

* Relay Replacement (Attached to Wire Harness) (See: Power and Ground Distribution/Power Distribution Relay/Service and Repair/Relay

Replacement (Attached to Wire Harness))Relay Replacement (Within an Electrical Center) (See: Power and Ground Distribution/Power

Distribution Relay/Service and Repair/Relay Replacement (Within an Electrical Center))

* Control Module References (See: Testing and Inspection/Programming and Relearning) for engine control module replacement, setup, and

programming

P0685 or P0690

DTC P0685 or P0690 (LF1)

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System

Check - Vehicle) prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an

overview of the diagnostic approach.

* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure

Instructions) provides an overview of each diagnostic category.

DTC Descriptors

DTC P0685

- Engine Controls Ignition Relay Control Circuit

DTC P0690

- Engine Controls Ignition Relay Feedback Circuit High Voltage

Diagnostic Fault Information

2010 Cadillac CTS Sedan AWD V6-3.0L Page 1589

2010 Cadillac CTS Sedan AWD V6-3.0L Page 1589

瀚慖f the test lamp illuminates, test the control circuit for a short to ground. If the circuit tests normal, replace the K20 ECM.

7. Connect a DMM set to the diode setting between the control circuit terminal 86 and ground.

8. Ignition ON, verify the DMM does not display OL.

瀚慖f the DMM displays OL, test the control circuit for a short to voltage, or an open/high resistance. If the circuit tests normal, replace the

K20 ECM.

9. If all circuits test normal, replace the KR75 powertrain relay.

Component Testing

Note: Depending on the application, the relay coil resistance will be within one of the following ranges.

1. Test for one of the following resistance specifications between terminals 85 and 86 of the KR75 powertrain relay:

* 70-110 ohm

* 200-250 ohm

瀚慖f not within the specified range, replace the KR75 powertrain relay.

2. Measure for infinite resistance between the following terminals of the KR75 powertrain relay:

* 30 and 86

* 30 and 87

* 30 and 85

* 85 and 87

瀚慖f continuity is detected, replace the KR75 powertrain relay.

3. Connect a 20 A fused jumper wire from the positive terminal of the battery to relay terminal 85. Connect a jumper wire from the negative

terminal of the battery to relay terminal 86. Measure for less than 2 Ohms between terminals 30 and 87 of the relay.

瀚慖f greater than the specified value, replace the KR75 powertrain relay.

Repair Instructions

Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.

* Relay Replacement (Attached to Wire Harness) (See: Power and Ground Distribution/Power Distribution Relay/Service and Repair/Relay

Replacement (Attached to Wire Harness))Relay Replacement (Within an Electrical Center) (See: Power and Ground Distribution/Power

Distribution Relay/Service and Repair/Relay Replacement (Within an Electrical Center))

* Control Module References (See: Testing and Inspection/Programming and Relearning) for engine control module replacement, setup, and

programming

P0687

DTC P0685, P0686, P0687, P0689, or P0690

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System

Check - Vehicle) prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an

overview of the diagnostic approach.

* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure

Instructions) provides an overview of each diagnostic category.

DTC Descriptors

DTC P0685

- Engine Controls Ignition Relay Control Circuit

DTC P0686

- Engine Controls Ignition Relay Control Circuit Low Voltage

DTC P0687

- Engine Controls Ignition Relay Control Circuit High Voltage

2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1540

2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1540

瀚慖f the test lamp illuminates, test the control circuit for a short to ground. If the circuit tests normal, replace the K20 ECM.

7. Connect a DMM set to the diode setting between the control circuit terminal 85 and ground.

8. Ignition ON, verify the DMM does not display OL.

瀚慖f the DMM displays OL, test the control circuit for a short to voltage, or an open/high resistance. If the circuit tests normal, replace the

K20 ECM.

9. If all circuits test normal, replace the KR75 powertrain relay.

Component Testing

Note: Depending on the application, the relay coil resistance will be within one of the following ranges.

1. Test for one of the following resistance specifications between terminals 85 and 86 of the KR75 powertrain relay:

* 70-110 ohm

* 200-250 ohm

瀚慖f not within the specified range, replace the KR75 powertrain relay.

2. Measure for infinite resistance between the following terminals of the KR75 powertrain relay:

* 30 and 86

* 30 and 87

* 30 and 85

* 85 and 87

瀚慖f continuity is detected, replace the KR75 powertrain relay.

3. Connect a 15 A fused jumper wire from the positive terminal of the battery to relay terminal 85. Connect a jumper wire from the negative

terminal of the battery to relay terminal 86. Measure for less than 2 Ohms between terminals 30 and 87 of the relay.

瀚慖f greater than the specified value, replace the KR75 powertrain relay.

Repair Instructions

Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.

* Relay Replacement (Attached to Wire Harness) (See: Power and Ground Distribution/Power Distribution Relay/Service and Repair/Relay

Replacement (Attached to Wire Harness))Relay Replacement (Within an Electrical Center) (See: Power and Ground Distribution/Power

Distribution Relay/Service and Repair/Relay Replacement (Within an Electrical Center))

* Control Module References (See: Testing and Inspection/Programming and Relearning) for engine control module replacement, setup, and

programming

P0690

DTC P0685, P0686, P0687, P0689, or P0690 (LAU)

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System

Check - Vehicle) prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an

overview of the diagnostic approach.

* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure

Instructions) provides an overview of each diagnostic category.

DTC Descriptors

DTC P0685

- Engine Controls Ignition Relay Control Circuit

DTC P0686

- Engine Controls Ignition Relay Control Circuit Low Voltage

DTC P0687

- Engine Controls Ignition Relay Control Circuit High Voltage

2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 2972

2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 2972

瀚慖f the test lamp illuminates, test the control circuit for a short to ground. If the circuit tests normal, replace the ECM.

5. Remove the test lamp.

6. Command the appropriate cylinder deactivation solenoid ON with a scan tool. Verify the scan tool Cylinder Deactivation Solenoid Valve

Control Circuit High Voltage Test Status parameter displays OK.

瀚慖f not the specified value, test the appropriate control circuit listed below for a short to voltage. If the circuit tests normal, replace the

ECM.

* Cylinder deactivation solenoid valve 1 terminal C

* Cylinder deactivation solenoid valve 2 terminal A

* Cylinder deactivation solenoid valve 3 terminal B

* Cylinder deactivation solenoid valve 4 terminal D

7. Install a 3 A fused jumper wire between the appropriate control circuit terminal listed below and the ignition circuit terminal E. Command the

appropriate cylinder deactivation solenoid ON with a scan tool. Verify the scan tool Cylinder Deactivation Solenoid Valve Control Circuit

High Voltage Test Status parameter displays Malfunction.

* Cylinder deactivation solenoid valve 1 terminal C

* Cylinder deactivation solenoid valve 2 terminal A

* Cylinder deactivation solenoid valve 3 terminal B

* Cylinder deactivation solenoid valve 4 terminal D

瀚慖f not the specified value, test the control circuit for an open/high resistance. If the circuit tests normal, replace the ECM.

8. If all the circuits test normal, test or replace the valve lifter oil manifold assembly.

Component Testing

Static Test

1. Ignition OFF, open the hood to disable the Auto-Stop function. Refer to Hybrid Modes of Operation Description ( See: Hybrid Drive

Systems/Description and Operation/Hybrid Modes of Operation).

2. Ignition ON, verify the scan tool Hood Position parameter displays Open.

瀚慖f not the specified value, refer to Diagnostic Trouble Code (DTC) List - Vehicle (See: Diagnostic Trouble Code

Descriptions/Diagnostic Trouble Code (DTC) List - Vehicle) for DTC P254F.

3. Ignition OFF, disconnect the harness connector at the valve lifter oil manifold assembly.

4. Connect the harness that is labeled resistance from the displacement on demand (DOD) tester to the valve lifter oil manifold connector.

5. Connect the power leads from the DOD tester to B+ and ground. Test for 11-18 ohm on each valve lifter oil manifold solenoid.

瀚慖f not within the specified range for each solenoid, replace the valve lifter oil manifold assembly.

6. Test for infinite resistance between each valve lifter oil manifold circuit terminal and the valve lifter oil manifold housing.

瀚慖f not the specified value, replace the valve lifter oil manifold assembly.

Dynamic Test

1. Ignition OFF, open the hood to disable the Auto-Stop function. Refer to Hybrid Modes of Operation Description ( See: Hybrid Drive

Systems/Description and Operation/Hybrid Modes of Operation).

2. Ignition ON, verify the scan tool Hood Position parameter displays Open.

瀚慖f not the specified value, refer to Diagnostic Trouble Code (DTC) List - Vehicle (See: Diagnostic Trouble Code

Descriptions/Diagnostic Trouble Code (DTC) List - Vehicle) for DTC P254F.

3. Ignition OFF, disconnect the harness connector at the valve lifter oil manifold assembly.

4. Connect the cable that is labeled power from the displacement on demand DOD tester to the connector.

5. Connect the power leads from the DOD tester to B+ and ground.

6. Command each valve lifter oil manifold solenoid ON and OFF using the DOD tester. You should be able to hear each solenoid turn ON and

OFF.

瀚慖f the function does not perform as specified, replace the valve lifter oil manifold assembly.

Repair Instructions

Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.

* Valve Lifter Oil Manifold Replacement (See: Engine, Cooling and Exhaust/Engine/Camshaft, Lifters and Push Rods/Lifter / Lash

Adjuster/Service and Repair/Valve Lifter Oil Manifold Replacement)

2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 2575

2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 2575

瀚慖f the test lamp illuminates, test the control circuit for a short to voltage.

3. Verify that a test lamp illuminates between the ignition circuit terminal 85 and ground.

瀚慖f the test lamp does not illuminate, test the ignition circuit for a short to ground or a open/high resistance. If the circuit tests normal and

ignition circuit fuse is open, test all components connected to the ignition circuit and replace as necessary.

4. Verify that a test lamp illuminates between the relay B+ circuit terminal 30 and ground.

瀚慖f the test lamp does not illuminate, test the B+ circuit for a short to ground or a open/high resistance. If the circuit tests normal and B+

circuit fuse is open, replace the A/C clutch relay.

5. Disconnect the harness connector at the A/C clutch coil.

6. Test for less than 1 ohm between the ground circuit terminal 2 and ground.

瀚慖f greater than the specified range, test the ground circuit for an open/high resistance.

7. Connect the harness connector at the A/C clutch coil.

8. Connect a 10-amp fused jumper wire between the B+ circuit terminal 30 and control circuit terminal 87. Verify the A/C clutch is activated.

瀚慖f the A/C clutch does not activate, test the control circuit for an open/high resistance. If the circuit tests normal, test or replace the A/C

clutch.

9. Connect a test lamp between the ignition circuit terminal 85 and the control circuit terminal 86.

10. Command the A/C relay output function ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the

commanded states.

瀚慖f the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the ECM.

瀚慖f the test lamp is always OFF, test the control circuit for a short to voltage, or an open/high resistance. If the circuit tests normal, replace

the ECM.

11. If all circuits test normal, test or replace the A/C clutch relay.

Component Testing

1. Ignition OFF, disconnect the A/C COMP relay.

2. Test for 60-180 ohms between terminals 85 and 86.

瀚慖f the resistance is not within the specified range, replace the relay.

3. Test for infinite resistance between the following terminals:

* 30 and 86

* 30 and 87

* 30 and 85

* 85 and 87

瀚慖f not the specified value, replace the relay.

4. Install a 30-amp fused jumper wire between relay terminal 85 and 12 volts. Install a jumper wire between relay terminal 86 and ground. Test

for less than 2 ohms between terminals 30 and 87.

瀚慖f greater than the specified range, replace the relay.

Repair Instructions

Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.

* Relay Replacement (Attached to Wire Harness) (See: Power and Ground Distribution/Power Distribution Relay/Service and Repair/Relay

Replacement (Attached to Wire Harness))Relay Replacement (Within an Electrical Center) (See: Power and Ground Distribution/Power

Distribution Relay/Service and Repair/Relay Replacement (Within an Electrical Center))

* Control Module References (See: Testing and Inspection/Programming and Relearning) for ECM replacement, setup, and programming

HVAC - Automatic

DTC P0645

Diagnostic Instructions

2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 539

2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 539

瀚慖f the test lamp illuminates, test the control circuits listed below for a short to voltage:

* Passenger seat cushion and seat back terminal 3

* Passenger seat cushion element terminal 2

* Passenger seat back element terminal 4

6. If all circuits test normal, replace the HSM.

B2345 13

1. Ignition OFF, disconnect the X2, X4 harness connectors at the HSM.

2. Test for greater than 850 ohms between the signal and the low reference circuits listed below:

* Driver seat cushion terminal 9 X4 and terminal 6 X2

* Passenger seat cushion terminal 20 X4 and terminal 8 X2

瀚慖f less than the specified value, test for a short between the signal and low reference circuits. If the circuits test normal, replace the

appropriate seat cushion heater element/temperature sensor.

3. Test for greater than 850 ohms between the signal and the low reference circuits listed below:

* Driver seat back terminal 19 X4 and terminal 5 X2

* Passenger seat back terminal 10 X4 and terminal 7 X2

瀚慖f less than the specified value, test for a short between the signal and low reference circuits. If the circuits test normal, replace the

appropriate seat back heater element/temperature sensor.

4. If all circuits test normal, replace the HSM.

B2345 42 or B2345 4B

If either DTC is set, replace the HSM.

Repair Instructions

Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.

* Driver or Passenger Seat Back Cushion Heater Replacement (Escalade with HP2) ()Driver or Passenger Seat Back Cushion Heater

Replacement (Tahoe with HP2) ()Driver or Passenger Seat Back Cushion Heater Replacement (without HP2) ()

* Driver or Passenger Seat Cushion Heater Replacement (without HP2) ()Driver or Passenger Seat Cushion Heater Replacement (with HP2)

()

* Control Module References (See: Testing and Inspection/Programming and Relearning) for the HSM replacement, setup, and programming

Dealer Installed

DTC B2345 (Dealer Installed)

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System

Check - Vehicle) prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an

overview of the diagnostic approach.

* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure

Instructions) provides an overview of each diagnostic category.

DTC Descriptors

DTC B2345 00

- Seat Heater Disable Circuit

DTC B2345 13

- Seat Heater Elements Temperature Above Threshold

DTC B2345 42

- Seat Heater Elements Current Sensing Calibration Not Programmed

DTC B2345 4B

- Seat Heater Elements Current Sensing Calibration Out of Range

2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 654

2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 654

瀚慖f the test lamp illuminates, test the control circuits listed below for a short to voltage:

* Driver seat cushion and back element terminal 14 X1

* Driver seat cushion element terminal 11 X1

* Driver seat back element terminal 1 X1

5. Verify that a test lamp does not illuminate between the supply voltage circuit terminal 6 X1 and ground.

瀚慖f the test lamp illuminates, test the control circuits listed below for a short to voltage:

* Passenger seat cushion and back element terminal 6 X1

* Passenger seat cushion element terminal 14 X4

* Passenger seat back element terminal 4 X1

6. If all circuits test normal, replace the MSM.

Repair Instructions

Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.

* Driver or Passenger Seat Back Cushion Heater Replacement (Escalade with HP2) ()Driver or Passenger Seat Back Cushion Heater

Replacement (Tahoe with HP2) ()Driver or Passenger Seat Back Cushion Heater Replacement (without HP2) ()

* Driver or Passenger Seat Cushion Heater Replacement (without HP2) ()Driver or Passenger Seat Cushion Heater Replacement (with HP2)

()

* Control Module References (See: Testing and Inspection/Programming and Relearning) for the MSM replacement, setup, and programming

Rear Seat

DTC B2508 or B2509 (Rear Seat)

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System

Check - Vehicle) prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an

overview of the diagnostic approach.

* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure

Instructions) provides an overview of each diagnostic category.

DTC Descriptors

DTC B2508 01

- Seat Heater Relay Circuit Short to Battery

DTC B2508 02

- Seat Heater Relay Circuit Short to Ground

Diagnostic Fault Information

2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 648

2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 648

瀚慖f the test lamp illuminates, test the control circuits listed below for a short to voltage:

* Right rear seat cushion terminal 6

* Right rear seat cushion terminal 2

6. If all circuits test normal, replace the RHSM.

Repair Instructions

Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.

* Rear Seat Cushion Heater Replacement ()

* Control Module References (See: Testing and Inspection/Programming and Relearning) for the RHSM replacement, setup, and

programming

Dealer Installed

DTC B2508 or B2509 (Dealer Installed)

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System

Check - Vehicle) prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an

overview of the diagnostic approach.

* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure

Instructions) provides an overview of each diagnostic category.

DTC Descriptors

DTC B2508 01

- Seat Heater Relay Circuit Short to Battery

DTC B2508 02

- Seat Heater Relay Circuit Short to Ground

Diagnostic Fault Information

2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 643

2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 643

瀚慖f the test lamp illuminates, test the control circuits listed below for a short to voltage:

* Driver seat cushion and back element terminal 14 X1

* Driver seat cushion element terminal 11 X1

* Driver seat back element terminal 1 X1

5. Verify that a test lamp does not illuminate between the supply voltage circuit terminal 6 X1 and ground.

瀚慖f the test lamp illuminates, test the control circuits listed below for a short to voltage:

* Passenger seat cushion and back element terminal 6 X1

* Passenger seat cushion element terminal 14 X4

* Passenger seat back element terminal 4 X1

6. If all circuits test normal, replace the MSM.

Repair Instructions

Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.

* Driver or Passenger Seat Back Cushion Heater Replacement (Escalade with HP2) ()Driver or Passenger Seat Back Cushion Heater

Replacement (Tahoe with HP2) ()Driver or Passenger Seat Back Cushion Heater Replacement (without HP2) ()

* Driver or Passenger Seat Cushion Heater Replacement (without HP2) ()Driver or Passenger Seat Cushion Heater Replacement (with HP2)

()

* Control Module References (See: Testing and Inspection/Programming and Relearning) for the MSM replacement, setup, and programming

Dealer Installed

DTC B2508 or B2509 (Dealer Installed)

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System

Check - Vehicle) prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an

overview of the diagnostic approach.

* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure

Instructions) provides an overview of each diagnostic category.

DTC Descriptors

DTC B2508 01

- Seat Heater Relay Circuit Short to Battery

DTC B2508 02

- Seat Heater Relay Circuit Short to Ground

Diagnostic Fault Information

2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 572

2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 572

瀚慖f the test lamp illuminates, test the control circuits listed below for a short to voltage:

* Driver seat cushion and seat back element terminal 3

* Driver seat cushion element terminal 5

* Driver seat back element terminal 1

5. Verify that a test lamp does not illuminate between the supply voltage circuit terminal 6 and ground.

瀚慖f the test lamp illuminates, test the control circuits listed below for a short to voltage:

* Passenger seat cushion and seat back element terminal 6

* Passenger seat cushion element terminal 2

* Passenger seat back element terminal 4

6. If all circuits test normal, replace the HSM.

B2345 13

1. Ignition OFF, disconnect the X2, X4 harness connectors at the HSM.

2. Test for greater than 850 Ohms between the signal and the low reference circuits listed below:

* Driver seat cushion terminal 9 X4 and terminal 6 X2

* Passenger seat cushion terminal 20 X4 and terminal 8 X2

瀚慖f less than the specified value, test for a short between the signal and low reference circuits. If the circuits test normal, replace the

appropriate seat cushion heater element/temperature sensor.

3. Test for greater than 850 Ohms between the signal and the low reference circuits listed below:

* Driver seat back terminal 19 X4 and terminal 5 X2

* Passenger seat back terminal 10 X4 and terminal 7 X2

瀚慖f less than the specified value, test for a short between the signal and low reference circuits. If the circuits test normal, replace the

appropriate seat back heater element/temperature sensor.

4. If all circuits test normal, replace the HSM.

B2345 42 or B2345 4B

If either DTC is set, replace the HSM.

Repair Instructions

Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.

* Driver or Passenger Seat Back Cushion Heater Replacement (Escalade with HP2) ()Driver or Passenger Seat Back Cushion Heater

Replacement (Tahoe with HP2) ()Driver or Passenger Seat Back Cushion Heater Replacement (without HP2) ()

* Driver or Passenger Seat Cushion Heater Replacement (without HP2) ()Driver or Passenger Seat Cushion Heater Replacement (with HP2)

()

* Control Module References (See: Testing and Inspection/Programming and Relearning) for the HSM replacement, setup, and programming

Rear Seat

DTC B2345 (Rear Seat)

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System

Check - Vehicle) prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an

overview of the diagnostic approach.

* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure

Instructions) provides an overview of each diagnostic category.

DTC Descriptors

DTC B2345 00

- Seat Heater Disable Circuit