Diagnosis And Testing - Remote Switches

Any diagnosis of the Audio system should begin with the use of the scan tool. For information on the use of the scan tool, refer to the appropriate Diagnostic Service Information. 

For complete circuit diagrams, refer to the appropriate wiring information.

1. Disconnect and isolate the battery negative cable.
2. Remove the remote radio switch(es) from the steering wheel. Refer to SWITCH, Remote Radio, Removal .
3. Use an ohmmeter to check the switch resistance as shown in the Remote Radio Switch Test table
   REMOTE RADIO SWITCH TEST
   
   

   Switch	Switch Position	Resistance
   Right (White)	Volume Up	1.210 Kilohms
   Right (White)	Volume Down	3.010 Kilohms
   Right (White)	Mode Advance	0.0511 Kilohms
   Left (Black)	Seek Up	0.261 Kilohms
   Left (Black)	Seek Down	0.681 Kilohms
   Left (Black)	Pre-Set Station Advance	0.162 Kilohms

   NOTE:

   The right remote radio switch back is white in color. The left switch back is black in color. The right/left remote radio switch orientation is with the steering wheel installed, and driver in driver's seat.

4. If the switch resistance checks OK, go to  5. If not OK, replace the faulty switch.
5. Check for continuity between the ground circuit cavity of the switch wire harness connector and a good ground. There should be continuity. If OK, go to  6. If not OK, repair the open circuit as required.
6. Unplug the connector from the Cab Compartment Node (CCN). Check for continuity between the radio control circuit cavity of the remote radio switch wire harness connector and a good ground. There should be no continuity. If OK, go to  7. If not OK, repair the short circuit as required.
7. Check for continuity between the radio control circuit cavities of the remote radio switch wire harness connector and the CCN wire harness connector. There should be continuity. If OK, refer to the proper Diagnostic Procedures information to test the CCN and the CAN data bus. If not OK, repair the open circuit as required.