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 (IPC) 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
The switch must be stuck or pressed for at least 5 seconds.
Action Taken When the DTC Sets
The Instrument Cluster (IPC) will ignore the switch command.
Conditions for Clearing the MIL/DTC
The stuck switch condition must be corrected.
Diagnostic Aids
| • | The following may cause an intermittent: |
| - | A bent terminal |
| - | A backed out terminal |
| - | A damaged terminal |
| - | Poor terminal tension |
| - | A chafed wire |
| - | A broken wire inside the insulation |
| • | When diagnosing for an intermittent short or an open, massage the wire harness while watching the test equipment for changes. |
Test Description
The number below refers to the step number on the diagnostic table.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
Schematic Reference: Steering Wheel Controls Schematics | ||||
1 | Did you perform the Radio/Audio System Diagnostic System Check? | -- | Go to Step 2 | |
Does the Steering Wheel Controls parameter indicate the specified range? | 0-7 Counts | Go to Diagnostic Aids | Go to Step 3 | |
3 | Replace the steering wheel convenience switches. Refer to Steering Wheel Control Switch Assembly Replacement in Steering and Column. Did you complete the replacement? | -- | Go to Step 4 | -- |
4 |
Does the DTC reset? | -- | Go to Step 2 | System OK |
