Schematic Reference: HVAC Schematics

Connector End View Reference: HVAC Connector End Views

DEFINITION: The steering wheel temperature and/or blower motor switch will not adjust the HVAC temperatures or the blower speeds. No DTCs have been set.

Did you perform the Diagnostic System Check - Vehicle?

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Go to Step 2

Go to Diagnostic System Check - Vehicle in Vehicle DTC Information

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 HVAC switch in both directions.

Do the counts change for any switch pressed?

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Go to Step 3

Go to Step 5

1. With a scan tool observe the Steering Wheel Controls parameter in the DIM data list.
2. Press each radio and HVAC switch in both directions.

Do the counts change for all switches pressed?

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Go to Step 4

Go to Step 9

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 10

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 left steering wheel controls. Refer to Steering Wheel HVAC Control Assembly Replacement .
4. Turn ON the ignition, with the engine OFF.
5. Connect a 3-amp fused jumper wire between the remote radio control head supply voltage circuit and the steering wheel controls circuit of the left steering wheel controls.

Do the counts change?

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Go to Step 9

Go to Step 6

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

Does the voltage measure near the specified value?

12 V

Go to Step 7

Go to Step 8

Test the steering wheel controls circuit of the left steering wheel controls for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

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Go to Step 13

Go to Step 10

Test the remote radio control head supply voltage circuit of the left 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 13

Go to Step 10

Inspect for poor connections at the harness connector of the left 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 13

Go to Step 11

Inspect for poor connections at the harness connector of the 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 13

Go to Step 12

Replace the left steering wheel controls. Refer to Steering Wheel HVAC Control Assembly Replacement .

Did you complete the replacement?

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Go to Step 13

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Replace the DIM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming.

Did you complete the replacement?

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Go to Step 13

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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 14

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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