2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 323

2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 323

* Air Temperature Description and Operation (See: Heating and Air Conditioning/Description and Operation/HVAC - Automatic/Air

Temperature Description and Operation)

* Air Delivery Description and Operation (See: Heating and Air Conditioning/Description and Operation/HVAC - Automatic/Air Delivery

Description and Operation)

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit

Testing/Circuit Testing)

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

Procedures/Connector Repairs/Connector Repairs)

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

Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)

* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring

Repairs/Wiring Repairs)

Scan Tool Reference

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

Circuit/System Verification

1. Measure actual outside air temperature using a thermometer. Compare this value to the scan tool Outside Air Temp. Raw parameter. The

measured temperature should be within 5 degrees of parameter.

瀚慖f 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.

瀚慖f 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.

瀚慖f 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.

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.

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

瀚慖f 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掳C (-39掳F).

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.

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.

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.

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

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