Radio, Stereo and Compact Disc System

DTC B2815

CIRCUIT DESCRIPTION
The steering wheel controls are momentary contact switches that connect a series of resistors so that each switch selection corresponds to a fixed resistance value. The body control module (BCM) determines which switch has been pressed by the voltage drop across the corresponding resistance value. The BCM supplies voltage to the steering wheel controls through the rear wiper/washer switch supply voltage circuit. The BCM monitors the switch voltage on the remote radio control signal circuit.

DTC DESCRIPTOR
This diagnostic procedure supports the following DTC:
DTC B2815 Steering Wheel Controls Illegal Resistance Value

CONDITIONS FOR RUNNING THE DTC
This test is run every 125 milliseconds.

CONDITIONS FOR SETTING THE DTC
The BCM detects a switch voltage that is higher than normal.

ACTION TAKEN WHEN THE DTC SETS
The BCM will ignore the switch command.

CONDITIONS FOR CLEARING THE MIL/DTC
- The DTC will become history if the BCM no longer detects a circuit malfunction.
- The history DTC will clear after 100 fault free ignition cycles.
- The DTC can be cleared with a scan tool.

TEST DESCRIPTION

Step 1 - Step 10:

Step 11 - Step 12:

The number below refers to the step number on the diagnostic table.
3. This step tests for the proper operation of the circuit in the low voltage range.