CADILLAC

Friday, March 26, 2021

2010 Cadillac CTS Sedan AWD V6-3.6L Page 386

Accessory circuit is shorted to voltage.

B1380 06

* Accessory circuit is open.

* Ignition, accessory, or off/run/crank circuit shorted to ground.

* B+ circuit of the ignition switch is open or shorted to ground.

B1440 00

BCM senses an open or short to voltage on the off/run/crank circuit when both ignition accessory/run and ignition run/crank parameters are active.

BCM senses an open on the B+ circuit to the ignition switch while the engine is running. An open on the B+ circuit can be caused by a short to

ground on any of the circuits listed below:

* B+

* Accessory

* Run/crank ignition voltage BCM terminal 19, X4

* Off/run/crank

B1441 01

Off/run/crank circuit is shorted to voltage.

B1441 06

Off/run/crank circuit is open.

Actions Taken When the DTC Sets

* The BCM operates in a fail-safe power mode dependent on the last valid power mode detected and the state of the engine run flag data on the

serial data communications circuits.

* The other modules on the vehicle operate in a fail-safe power mode dependent on the last valid power mode transmitted by the BCM and the

state of the engine run flag on the serial data communications circuits.

Conditions for Clearing the DTC

A current DTC clears when the malfunction is no longer present.

Diagnostic Aids

* A short to ground in the ignition circuit of the run crank relay will cause an open fuse to the ignition switch. DTC B1428 should be current.

* The power modes and controls are determined using BCM logic. Comparing the Body Control Module Power Mode data display parameters

listed in Circuit/System Verification to the scan tool values of the vehicle will determine if there is a power mode fault.

Reference Information

Schematic Reference

* Power Distribution Schematics (See: Diagrams/Electrical Diagrams/Starting and Charging/Power and Ground Distribution/System

Diagram/Power Distribution Schematics)

* Power Moding Schematics (See: Diagrams/Electrical Diagrams/Starting and Charging/Power and Ground Distribution/System

Diagram/Power Moding Schematics)

Connector End View Reference

Component Connector End Views (See: Diagrams/Connector Views)

Description and Operation

Power Mode Description and Operation (See: Power and Ground Distribution/Description and Operation/Power Mode Description and Operation)

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit Testing/Circuit Testing)

* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Connector Repairs/Connector Repairs)

* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit

Testing/Testing for Intermittent Conditions and Poor Connections)

* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Wiring Repairs/Wiring Repairs)

Scan Tool Reference

Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information

2010 Cadillac CTS Sedan AWD V6-3.6L Page 229

* Air temperature actuator-left terminal 1

* Air temperature actuator-right terminal 2

* Mode actuator terminal 2

* Recirculation actuator terminal 1

瀚慖f greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the HVAC

control module.

5. Ignition ON, test for 4.8-5.2 volts between the following 5-volt reference circuit terminal and ground.

* Air temperature actuator-left terminal 2

* Air temperature actuator-right terminal 1

* Mode actuator terminal 1

* Recirculation actuator terminal 3

瀚慖f less than the specified range, test the 5-volt reference circuit for a short to ground or an open/high resistance. If the circuit tests normal,

replace the HVAC control module.

瀚慖f greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the HVAC

control module.

6. Verify the scan tool Door Position parameter is greater than 250 counts.

瀚慖f less than the specified range, test the following signal circuit for a short to ground. If the circuit tests normal, replace the HVAC control

module.

* Air temperature actuator-left terminal 3

* Air temperature actuator-right terminal 3

* Mode actuator terminal 3

* Recirculation actuator terminal 5

7. Install a 3A fused jumper wire between the following signal circuit terminal and the low reference circuit terminal. Verify the scan tool Door

Position parameter is less than 3 counts.

* Air temperature actuator-left terminal 3 and terminal 1

* Air temperature actuator-right terminal 3 and terminal 2

* Mode actuator terminal 3 and terminal 2

* Recirculation actuator terminal 5 and terminal 1

瀚慖f greater than the specified range, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal,

replace the HVAC control module.

8. Ignition OFF, test for less than 10 ohms between the following control circuit terminal and ground.

* Air temperature actuator-left terminal 5

* Air temperature actuator-right terminal 5

* Mode actuator terminal 5

* Recirculation actuator terminal 6

瀚慖f greater than the specified range, test the control circuit for a short to voltage or an open/high resistance. If circuit tests normal, replace

the HVAC control module.

9. Ignition OFF, test for less than 10 ohms between the following control circuit terminal and ground.

* Air temperature actuator-left terminal 4

* Air temperature actuator-right terminal 4

* Mode actuator terminal 4

* Recirculation actuator terminal 7

瀚慖f greater than the specified range, test the control circuit for a short to voltage or an open/high resistance. If circuit tests normal, replace

the HVAC control module.

10. Connect a test lamp between following control circuit terminals.

* Air temperature actuator-left terminal 5 and terminal 4

* Air temperature actuator-right terminal 5 and terminal 4

* Mode actuator terminal 5 and terminal 4

* Recirculation actuator terminal 6 and terminal 7

11. Ignition ON, command the appropriate actuator door in both directions with a scan tool. The test lamp should turn ON and OFF when

2010 Cadillac CTS Sedan AWD V6-3.6L Page 994

Reference Information

Schematic Reference

Engine Controls Schematics (LLT) (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)Engine Controls Schematics

(LF1) (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)

Connector End View Reference

Component Connector End Views (See: Diagrams/Connector Views)

Description and Operation

Fuel System Description (See: Powertrain Management/Computers and Control Systems/Description and Operation/Fuel System Description)

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit Testing/Circuit Testing)

* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Connector Repairs/Connector Repairs)

* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit

Testing/Testing for Intermittent Conditions and Poor Connections)

* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Wiring Repairs/Wiring Repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (See: Diagnostic Trouble Code Descriptions/Powertrain Diagnostic Trouble Code

(DTC) Type Definitions)

Scan Tool Reference

Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information

Circuit/System Verification

1. Engine idling, observe the Fuel Rail Pressure Sensor parameter with a scan tool. The pressure should be approximately 3.5-5.5 MPa (508-798

psi).

2. Command an increase and decrease in fuel rail pressure with a scan tool. Observe the scan tool Fuel Rail Pressure Sensor parameter. The

Fuel Rail Pressure Sensor should increase or decrease with each command.

3. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the

conditions that you observed from the Freeze Frame/Failure Records data.

Circuit/System Testing

1. Ignition OFF.

2. Disconnect the harness connector at the G18 high pressure fuel pump.

3. Engine operating, verify that a test lamp flashes between the low control circuit terminal 1 and B+.

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

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

replace the K20 ECM.

4. Ignition ON, verify that a test lamp illuminates between the high control circuit terminal 2 and ground.

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

Component Testing

Static Test

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

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

2. Test for 0.35-0.6 ohm at 20掳C (68掳F) of resistance between low control circuit terminal 1 and high control circuit terminal 2.

瀚慖f the resistance is less than 0.3 ohm or greater than 0.6 ohm, replace the high pressure fuel pump.

3. Test for infinite resistance between each terminal and the high pressure fuel pump housing/case.

瀚慖f not the specified value, replace the high pressure fuel pump.

2010 Cadillac CTS Sedan AWD V6-3.6L Page 307

7. If the circuit tests normal, test or replace the appropriate speaker.

Repair Instructions

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

* Speaker Replacement Reference (See: Accessories and Optional Equipment/Testing and Inspection/Symptom Related Diagnostic

Procedures/Cellular, Entertainment, and Navigation/Speaker Replacement Reference)

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

B1055

DTC B1025-B1125

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) provide an overview of each diagnostic category.

DTC Descriptors

DTC B1025 01

- Audio Output 1 Left Front Circuit Short to Battery (LF Door)

DTC B1025 02

- Audio Output 1 Left Front Circuit Short to Ground (LF Door)

DTC B1025 04

- Audio Output 1 Left Front Circuit Open (LF Door)

DTC B1035 01

- Audio Output 2 Right Front Circuit Short to Battery (RF Door)

DTC B1035 02

- Audio Output 2 Right Front Circuit Short to Ground (RF Door)

DTC B1035 04

- Audio Output 2 Right Front Circuit Open (RF Door)

DTC B1045 01

- Audio Output 3 Left Rear Circuit Short to Battery (LR Door)

DTC B1045 02

- Audio Output 3 Left Rear Circuit Short to Ground (LR Door)

DTC B1045 04

- Audio Output 3 Left Rear Circuit Open (LR Door)

DTC B1055 01

- Audio Output 4 Right Rear Circuit Short to Battery (RR Door)

DTC B1055 02

- Audio Output 4 Right Rear Circuit Short to Ground (RR Door)

DTC B1055 04

- Audio Output 4 Right Rear Circuit Open (RR Door)

DTC B1065 01

- Audio Output 5 Circuit Short to Battery (Center IP)

DTC B1065 02

- Audio Output 5 Circuit Short to Ground (Center IP)

DTC B1065 04

- Audio Output 5 Circuit Open (Center IP)

2010 Cadillac CTS Sedan AWD V6-3.6L Page 467

ignition is cycled OFF then back to ACC or RUN.

* The history DTC will clear after 50 consecutive fault-free ignition cycles have occurred.

Diagnostic Aids

* All position sensors use common ground and 5 V reference circuits.

* If the 5 V reference circuit is shorted to voltage multiple position sensor codes will set.

* If the 5 V reference circuit is shorted to ground multiple position sensor codes will set.

* If the sensor ground circuit is open multiple codes will set.

* DTC failure type 5 A will set if the sensor setting this DTC is either mounted or wired incorrectly, or the polarity of the motor control circuits

are reversed.

Reference Information

Schematic Reference

Driver Seat Schematics (See: Body and Frame/Seats/Diagrams/Electrical Diagrams/Driver Seat Schematics)

Connector End View Reference

Component Connector End Views (See: Diagrams/Connector Views)

Description and Operation

* Memory Seats Description and Operation (See: Body and Frame/Seats/Description and Operation/Memory Seats)

* Lumbar Support Description and Operation (Without Memory-A45) (See: Body and Frame/Seats/Description and Operation/Lumbar

Support Description and Operation (Without Memory-A45))Lumbar Support Description and Operation (With Memory-A45) (See: Body

and Frame/Seats/Description and Operation/Lumbar Support Description and Operation (With Memory-A45))

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit Testing/Circuit Testing)

* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Connector Repairs/Connector Repairs)

* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit

Testing/Testing for Intermittent Conditions and Poor Connections)

* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Wiring Repairs/Wiring Repairs)

Scan Tool Reference

Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information

Circuit/System Verification

Ignition ON, observe the scan tool Memory Seat Module driver seat and lumbar position sensor parameters. The readings should be between 0.22 V

and 4.75 V and change while adjusting seat and lumbar positions.

Circuit/System Testing

B1825 01 or B1825 06

1. Ignition OFF, disconnect the X2 harness connector at the seat recline motor.

2. Test for less than 2 Ohms between the appropriate low reference circuit terminal listed below and ground:

* Terminal 1 (LHD)

* Terminal 3 (RHD)

瀚慖f greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the MSM.

3. Ignition ON, test for 4.8 - 5.2 V between the appropriate 5 V reference circuit terminal listed below and ground:

* Terminal 3 (LHD)

* Terminal 1 (RHD)

瀚慖f less than the specified range, test the 5 V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal,

replace the MSM.

瀚慖f greater than the specified range, test the 5 V reference circuit for a short to voltage. If the circuit tests normal, replace the MSM.

4. Verify the scan tool Driver Seat Recline Sensor parameter is less than 1.0 V.

瀚慖f greater than the specified range, test the signal circuit terminal 2 for a short to voltage. If the circuit tests normal, replace the MSM.

5. Install a 3 A fused jumper wire between the signal circuit terminal 2 and the appropriate 5 V reference circuit terminal listed below. Verify

the scan tool Driver Seat Recline Sensor parameter is greater than 4.75 V.

2010 Cadillac CTS Sedan AWD V6-3.6L Page 576

Conditions for Running the DTC

Battery voltage is between 9-16 volts.

Conditions for Setting the DTC

The BCM detects a fault in the trunk release relay control circuit.

Action Taken When the DTC Sets

The rear compartment latch will not operate.

Conditions for Clearing the DTC

* The DTC will be current for as long as the fault is present.

* When the fault is no longer present, the DTC will be a history DTC.

* A history DTC will clear after 50 ignition cycles

Reference Information

Schematic Reference

Release Systems Schematics (See: Body and Frame/Locks/Diagrams/Electrical Diagrams/Release Systems Schematics)

Connector End View Reference

Component Connector End Views (See: Diagrams/Connector Views)

Description and Operation

Luggage Compartment Description and Operation (See: Body and Frame/Doors, Hood and Trunk/Trunk / Liftgate/Description and Operation)

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit Testing/Circuit Testing)

* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Connector Repairs/Connector Repairs)

* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit

Testing/Testing for Intermittent Conditions and Poor Connections)

* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Wiring Repairs/Wiring Repairs)

Scan Tool Reference

Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information

Circuit/System Verification

Ignition ON, command the trunk release with a scan tool. The rear compartment lid latch should release the trunk lid.

Circuit/System Testing

1. Ignition OFF, disconnect the TRUNK/RELSE relay.

2. Test for less than 5 ohms between the ground circuit terminal 85 and ground.

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

3. Connect a test lamp between the control circuit terminal 86 and the ground circuit terminal 85.

4. Ignition ON, command the trunk release 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 voltage. If the circuit tests normal, replace the BCM.

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

the BCM.

5. If all circuits test normal, test or replace the TRUNK/RELSE relay.

Component Testing

Relay Test

1. Ignition OFF, disconnect the TRUNK/RELSE relay.

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

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

2010 Cadillac CTS Sedan AWD V6-3.6L Page 611

Diagnostic Fault Information

Circuit/System Description

When the content theft deterrent (CTD) system arms and the inclination and intrusion sensors are enabled, the body control module (BCM) receives

a power-up acknowledgement from the sensors via the sensor signal circuit.

Conditions for Running the DTC

* The inclination and intrusion sensors are enabled

* The CTD system has armed

Conditions for Setting the DTC

The BCM does not receive the power-up acknowledgement from the inclination and intrusion sensors

Action Taken When the DTC Sets

The BCM will ignore all inputs from the inclination and intrusion sensors for the remainder of the CTD system arming cycle

Conditions for Clearing the DTC

A current DTC will clear when the BCM receives a power-up acknowledgement during the next CTD system arming cycle

Reference Information

Schematic Reference

Theft Deterrent System Schematics (See: Accessories and Optional Equipment/Antitheft and Alarm Systems/Diagrams/Electrical Diagrams/Theft

Deterrent System Schematics)

Connector End View Reference

Component Connector End Views (See: Diagrams/Connector Views)

Description and Operation

Content Theft Deterrent (CTD) Description and Operation (See: Accessories and Optional Equipment/Antitheft and Alarm Systems/Description

and Operation/Content Theft Deterrent (CTD) Description and Operation)

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit Testing/Circuit Testing)

* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Connector Repairs/Connector Repairs)

* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit

Testing/Testing for Intermittent Conditions and Poor Connections)

* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Wiring Repairs/Wiring Repairs)

Scan Tool Reference

Refer to Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the inclination sensor.

2. Verify a test lamp illuminates between the B+ circuit terminal 1 and ground.

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

3. Disconnect the harness connector at the intrusion sensor.

4. Verify a test lamp illuminates between the B+ circuit terminal A and ground.

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

5. Ignition OFF, disconnect the harness connector at the intrusion sensor.

6. Ignition ON, verify a test lamp illuminates between the B+ circuit terminal A and ground.

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