2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 194

1. Ignition OFF, disconnect the harness connector at the appropriate temperature sensor.

2. Test for the appropriate resistance between the signal terminal A or 1 and the low reference terminal B or 2. Refer to Sensor Resistance Table

for Sensor Resistance Table (See: Heating and Air Conditioning/Specifications/Electrical Specifications) resistance values.

锟斤拷 If not within the specified range, replace the sensor.

Repair Instructions

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

* Air Temperature Sensor Replacement - Upper Auxiliary (See: Heating and Air Conditioning/Discharge Air Temperature Sensor /

Switch/Service and Repair/Air Temperature Sensor Replacement - Upper Auxiliary)

* Duct Air Temperature Sensor Replacement - Upper Right Side (See: Heating and Air Conditioning/Discharge Air Temperature Sensor /

Switch/Service and Repair/Duct Air Temperature Sensor Replacement - Upper Right Side)

* Duct Air Temperature Sensor Replacement - Upper Left Side (See: Heating and Air Conditioning/Discharge Air Temperature Sensor /

Switch/Service and Repair/Duct Air Temperature Sensor Replacement - Upper Left Side)

* Air Temperature Sensor Replacement - Lower Auxiliary (Delphi) (See: Heating and Air Conditioning/Discharge Air Temperature Sensor /

Switch/Service and Repair/Air Temperature Sensor Replacement - Lower Auxiliary (Delphi))

* Duct Air Temperature Sensor Replacement - Lower Left Side (See: Heating and Air Conditioning/Discharge Air Temperature Sensor /

Switch/Service and Repair/Duct Air Temperature Sensor Replacement - Lower Left Side)

* Duct Air Temperature Sensor Replacement - Lower Right Side (See: Heating and Air Conditioning/Discharge Air Temperature Sensor /

Switch/Service and Repair/Duct Air Temperature Sensor Replacement - Lower Right Side)

* Ambient Air Temperature Sensor Replacement (See: Heating and Air Conditioning/Ambient Temperature Sensor / Switch HVAC/Service

and Repair)

* Inside Air Temperature Sensor Replacement (See: Heating and Air Conditioning/Cabin Temperature Sensor / Switch/Service and Repair)

* Auxiliary Inside Air Temperature Sensor Assembly Replacement (See: Heating and Air Conditioning/Discharge Air Temperature Sensor /

Switch/Service and Repair/Auxiliary Inside Air Temperature Sensor Assembly Replacement)

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

programming

B0178

DTC B0158, B0163, B0168, B0173, B0178, B0509, B0514, B3578, or B3583

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 B0158 02

- Outside Air Temperature Sensor Circuit Short to Ground

DTC B0158 05

- Outside Air Temperature Sensor Circuit Short to Battery or Open

DTC B0163 02

- Passenger Compartment Temp Sensor 1 Circuit Short to Ground

DTC B0163 05

- Passenger Compartment Temp Sensor 1 Circuit Short to Battery or Open

DTC B0168 02

- Passenger Compartment Temp Sensor 2 Circuit Short to Ground

DTC B0168 05

- Passenger Compartment Temp Sensor 2 Circuit Short to Battery or Open

DTC B0173 02

- Output Air Temperature Sensor 1 Circuit Short to Ground

DTC B0173 05

- Output Air Temperature Sensor 1 Circuit Short to Battery or Open

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2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 88

DTC B051C 62:Left Side Assist Step Position Sensor Circuit Actuator Stuck Open

DTC B051C 63:Left Side Assist Step Position Sensor Circuit Actuator Stuck Closed

DTC B051D 2A:Right Side Assist Step Position Sensor Circuit Too Many Pulses

DTC B051D 22:Right Side Assist Step Position Sensor Circuit Low Time < Minimum

DTC B051D 29:Right Side Assist Step Position Sensor Circuit Too Few Pulses

DTC B051D 62:Right Side Assist Step Position Sensor Circuit Actuator Stuck Open

DTC B051D 63:Right Side Assist Step Position Sensor Circuit Actuator Stuck Closed

Diagnostic Fault Information

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 189

锟斤拷 If not within the specified range, refer to Ambient / Inside Air Temperature Sensor Circuit Malfunction.

2. Measure actual inside air temperature using a thermometer. Compare this value to the scan tool Inside Air Temp. Sensor parameter and Aux.

Inside Air Temp. parameter. The measured temperature should be within 5 degrees of parameter.

锟斤拷 If not within the specified range, refer to Ambient / Inside Air Temperature Sensor Circuit Malfunction.

3. Measure actual temperature using a thermometer at each of the duct temperature sensors. Compare this value to the appropriate scan tool Duct

Actual parameter. The measured temperature should be within 5 degrees of appropriate Duct Actual parameter.

锟斤拷 If not within the specified range, refer to Duct Temperature Sensor Circuit Malfunction.

Circuit/System Testing

Ambient / Inside Air Temperature Sensor Circuit Malfunction

1. Ignition OFF, disconnect the harness connector at the appropriate temperature sensor.

2. Test for less than 1 ohm between the low reference circuit terminal B and ground.

锟斤拷 If 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.

3. Ignition ON, verify the appropriate scan tool Temp Sensor parameter is greater than 85锟斤拷C (185锟斤拷F).

锟斤拷 If less than the specified range, test the signal circuit terminal A for a short to ground. If the circuit tests normal, replace the HVAC control

module.

4. Install a 3-amp fused jumper wire between the signal circuit terminal A and the low reference circuit terminal B. Verify the scan tool Temp

Sensor parameter is less than -35锟斤拷C (-39锟斤拷F).

锟斤拷 If 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.

5. If all circuits test normal, test or replace the appropriate temperature sensor.

Duct Temperature Sensor Circuit Malfunction

1. Ignition OFF, disconnect the harness connector at the appropriate temperature sensor.

2. Test for less than 1.0 ohm between the low reference circuit terminal 2 and ground.

锟斤拷 If 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.

3. Ignition ON, verify the appropriate Duct Temp Sensor Actual parameter is greater than 85锟斤拷C (185锟斤拷F).

锟斤拷 If less than the specified range, test the signal circuit terminal 1 for a short to ground. If the circuit tests normal, replace the HVAC control

module.

4. Install a 3-amp fused jumper wire between the signal circuit terminal 1 and the low reference circuit terminal 2. Verify the scan tool Duct

Temp Sensor Actual parameter is less than -35锟斤拷C (-39锟斤拷F).

锟斤拷 If 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.

5. If all circuits test normal, test or replace the appropriate temperature sensor.

Component Testing

1. Ignition OFF, disconnect the harness connector at the appropriate temperature sensor.

2. Test for the appropriate resistance between the signal terminal A or 1 and the low reference terminal B or 2. Refer to Sensor Resistance Table

for Sensor Resistance Table (See: Heating and Air Conditioning/Specifications/Electrical Specifications) resistance values.

锟斤拷 If not within the specified range, replace the sensor.

Repair Instructions

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

* Air Temperature Sensor Replacement - Upper Auxiliary (See: Heating and Air Conditioning/Discharge Air Temperature Sensor /

Switch/Service and Repair/Air Temperature Sensor Replacement - Upper Auxiliary)

* Duct Air Temperature Sensor Replacement - Upper Right Side (See: Heating and Air Conditioning/Discharge Air Temperature Sensor /

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2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 308

锟斤拷 If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the radio.

锟斤拷 If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the

radio.

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

DTC Set By The Radio UQA

1. Ignition OFF, disconnect the X3 harness connector at the amplifier.

2. Radio ON, test for 5.0-7.5 volts between the appropriate signal circuit terminal listed below and ground.

* Left front low level audio signal (+) - terminal 15

* Left front low level audio signal (-) - terminal 7

* Right front low level audio signal (+) - terminal 14

* Right front low level audio signal (-) - terminal 6

* Left rear low level audio signal (+) - terminal 13

* Left rear low level audio signal (-) - terminal 5

* Right rear low level audio signal (+) - terminal 12

* Right rear low level audio signal (-) - terminal 4

锟斤拷 If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the

radio.

锟斤拷 If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the radio.

3. If all circuits test normal, replace the amplifier.

DTC Set By Radio UQA with U42

1. Ignition OFF, disconnect the X3 harness connector at the amplifier.

2. Radio ON, test for 5.0-7.5 volts between the appropriate signal circuit terminal listed below and ground.

* Left front low level audio signal (+) - terminal 15

* Left front low level audio signal (-) - terminal 7

* Right front low level audio signal (+) - terminal 14

* Right front low level audio signal (-) - terminal 6

锟斤拷 If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the

radio.

锟斤拷 If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the radio.

3. Ignition OFF, reconnect the X3 harness connector at the amplifier.

4. Disconnect the X2 harness connector at the rear seat audio (RSA) module.

5. Radio ON, test for 5.0-7.5 volts between the appropriate signal circuit terminal listed below and ground.

* Left rear low level audio signal (+) - terminal 1

* Left rear low level audio signal (-) - terminal 2

* Right rear low level audio signal (+) - terminal 3

* Right rear low level audio signal (-) - terminal 4

锟斤拷 If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the

rear seat audio (RSA) module.

锟斤拷 If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the rear seat audio (RSA)

module.

6. Ignition OFF, reconnect the X2 harness connector at the rear seat audio (RSA) module.

7. Disconnect the X3 harness connector at the amplifier.

8. Radio ON, test for 5.0-7.5 volts between the appropriate signal circuit terminal listed below and ground.

* Left rear low level audio signal (+) - terminal 13

* Left rear low level audio signal (-) - terminal 5

* Right rear low level audio signal (+) - terminal 12

* Right rear low level audio signal (-) - terminal 4

锟斤拷 If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the

rear seat audio (RSA) module.

锟斤拷 If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the rear seat audio (RSA)

module.

9. If all circuits test normal, replace the amplifier.

DTC Set By Radio UQA with Y91 and U42 or UQS and U42