B1489

B1489-STEERING WHEEL CONTROL AUDIO SWITCH CIRCUIT



Theory of Operation

The Steering Wheel Control Audio Switch, when pressed, sends a multiplexed signal to the Right Steering Switch. The switching status is transferred to the Steering Control Module (SCM) by way of the LIN bus, a serial sub-bus. The SCM converts the data to CAN(B) and sends the message to the corresponding module on the bus.

- When Monitored:
Continuously with the ignition on.

- Set Condition:
The Steering Control Module senses that the Steering Wheel Control Audio Switch is in the Set position for greater than 50 seconds.





CHECK FOR AN ACTIVE DTC
1. Turn the ignition on.
2. With the scan tool, record and erase DTCs.
3. Press the AUDIO switch three times.
4. With the scan tool, read DTCs.

Does the scan tool display this DTC as Active?

Yes

- Replace the Left Steering Switch.
- Perform the BODY VERIFICATION TEST Body Verification Test.

No

- Test complete.