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 instrument cluster determines which switch has been pressed by the voltage drop across the corresponding resistance value.
Conditions for Running the DTC
This test is run every 300 milliseconds.
Conditions for Setting the DTC
One of the HVAC switches must be active (stuck) for at least 30 seconds.
Action Taken When the DTC Sets
The instrument cluster will ignore the switch command.
Conditions for Clearing the DTC
| • | The DTC will become history if the instrument cluster 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
If the condition is not present, 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 | ||||
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 to Diagnostic Aids | Go to Step 3 | |
3 | Replace the steering wheel controls. Refer to Steering Wheel Control Switches Replacement in Entertainment. Did you complete the replacement? | -- | Go to Step 4 | -- |
4 |
Does the DTC reset? | -- | Go to Step 2 | System OK |
