Schematic Reference: HVAC Schematics

Connector End View Reference: HVAC Connector End Views

DEFINITION: The steering wheel temperature switch will not adjust HVAC temperatures and no DTC's have been set.

Did you perform the HVAC Diagnostic System Check?

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Go to Step 2

Go to Diagnostic System Check - HVAC Systems - Automatic

1. Install a scan tool.
2. Turn ON the ignition, with the engine OFF.
3. With a scan tool, perform the Recalibrate all Motors command in Instrument Panel Module Special Functions.
4. With a scan tool, observe the current DTC list in Instrument Panel Module.
5. Does the scan tool display any DTCs?

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Go to Diagnostic Trouble Code (DTC) List

Go to Step 3

1. Install a scan tool.
2. Turn ON the ignition, with the engine OFF.
3. With a scan tool, observe the Steering Wheel Controls parameter in the Dash Integration Module (DIM) data list.
4. Press each radio and temperature switch in both directions.

Do the counts change for any switch pressed?

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Go to Step 4

Go to Step 6

1. With a scan tool, observe the Steering Wheel Controls parameter in the Dash Integration Module (DIM) data list.
2. Press each radio and temperature switch in both directions.

Do the counts change for all switches pressed?

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Go to Step 5

Go to Step 10

1. Turn ON the radio.
2. Increase and decrease the volume with the right steering wheel controls switch.

Do the radio steering wheel controls function?

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Go to Too Hot in Vehicle or Too Cold in Vehicle

Go to Step 11

Caution: Refer to SIR Caution in the Preface section.

1. Disable the SIR system. Refer to SIR Disabling and Enabling in SIR.
2. Turn OFF the ignition.
3. Remove and disconnect the right steering wheel controls. Refer to Steering Wheel Control Switch Assembly Replacement in Steering Wheel and Column.
4. Turn ON the ignition, with the engine OFF.
5. Connect a 3-amp fused jumper wire between the remote radio control supply voltage circuit and the steering wheel controls circuit of the right steering wheel controls.

Do the counts change?

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Go to Step 10

Go to Step 7

Measure the voltage from the remote radio control supply voltage circuit at the right steering wheel controls to a good ground.

Does the voltage measure near the specified value?

12 V

Go to Step 8

Go to Step 9

Test the steering wheel control signal circuit of the right steering wheel controls for an open or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

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Go to Step 14

Go to Step 11

Test the remote radio control supply voltage circuit of the right steering wheel controls for an open or a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

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Go to Step 14

Go to Step 11

Inspect for poor connections at the harness connector of the right steering wheel controls. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

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Go to Step 14

Go to Step 12

Inspect for poor connections at the harness connector of the dash integration module (DIM). Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

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Go to Step 14

Go to Step 13

Replace the right steering wheel controls. Refer to Steering Wheel Control Switch Assembly Replacement in Steering Wheel and Column.

Did you complete the replacement?

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Go to Step 14

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Important: Perform the Recalibration procedure for the DIM.

Replace the DIM. Refer to Dash Integration Module Replacement in Body Control System.

Did you complete the replacement?

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Go to Step 14

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Enable the SIR system. Refer to SIR Disabling and Enabling in SIR.

Is the SIR system enabled?

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Go to Step 15

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Operate the system in order to verify the repair.

Did you correct the condition?

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System OK

Go to Step 2