Circuit Description
The steering wheel controls are simple momentary contact switches that connect a series of resistors so that each switch selection corresponds to a fixed resistance value. The dash integration module (DIM) determines which switch has been pressed by the voltage drop across the corresponding resistance value.
Conditions for Running the DTC
The DIM must be powered.
Conditions for Setting the DTC
One of the left steering wheel control switches must be active (stuck) for at least 30 seconds.
Action Taken When the DTC Sets
The DIM will disable only the temperature and blower switches while the fault is present.
Conditions for Clearing the DTC
| • | The DTC will become history if the DIM no longer detects a failure. |
| • | The history DTC will clear after 50 fault free ignition cycles. |
| • | The DTC can be cleared with a scan tool. |
Diagnostic Aids
Switch Position | Counts |
|---|---|
No Input | 0 |
TEMP DOWN | 18 |
TEMP UP | 36 |
FAN DOWN | 55 |
FAN UP | 73 |
Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.
Test Description
The numbers below refer to the step numbers on the diagnostic table.
Step | Action | Values | Yes | No |
|---|---|---|---|---|
Schematic Reference: HVAC Schematics Connector End View Reference: HVAC Connector End Views | ||||
1 | Did you perform the HVAC Diagnostic System Check? | -- | Go to Step 2 | |
Does the scan tool indicate that the counts are within the specified range? | 0-7 Counts | Go Diagnostic Aids | Go to Step 3 | |
3 | Replace the steering wheel controls. Refer to Steering Wheel HVAC Control Assembly Replacement . Did you complete the replacement? | -- | Go to Step 4 | -- |
4 |
Does the DTC reset? | -- | Go to Step 2 | System OK |
