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 IPC receives a value that is not within the resistance value range.
Action Taken When the DTC Sets
The Instrument Cluster (IPC) will ignore the switch command.
Conditions for Clearing the MIL/DTC
The 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 numbers below refer to the step numbers on the diagnostic table.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
Schematic Reference: Steering Wheel Controls Schematics | ||||
1 | Did you perform the Radio/Audio 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 | Test the battery positive voltage circuit of the steering wheel control switch for an open or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 6 | Go to Step 4 |
4 | Test the steering wheel controls signal circuit for an open or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 6 | Go to Step 5 |
5 | Replace the steering wheel control switches. Refer to Steering Wheel Control Switches Replacement . Did you complete the replacement? | -- | Go to Step 6 | -- |
6 |
Does the DTC reset? | -- | Go to Step 2 | System OK |
