Remote Switches

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

For complete circuit diagrams, refer to the SYSTEM WIRING DIAGRAMS article.

1. Disconnect and isolate the battery negative cable. Remove the remote radio switch(es) from the steering wheel. See Electrical/Audio and Video/SWITCH, Remote Radio - Removal .
2. Use an ohmmeter to check the switch resistances as shown in the Remote Radio Switch Test chart. If the remote radio switch resistances check OK, go to  3. If not OK, replace the faulty switch.
   REMOTE RADIO SWITCH TEST
   
   

   Switch	Switch Position	Minimum Resistance	Nominal Resistance	Maximum Resistance
   Right (White)	Volume Up	6.732 ohms	6.8 ohms	6.868 ohms
   Right (White)	Volume Down	14.850 ohms	15 ohms	15.151 ohms
   Right (White)	Mode Advance	0 ohms	0 ohms	0 ohms
   Left (Black)	Seek Up	1.188 ohms	1.2 ohms	1.212 ohms
   Left (Black)	Seek Down	3.267 ohms	3.3 ohms	3.333 ohms
   Left (Black)	Pre-Set Station Advance	465 ohms	47 ohms	474 ohms

3. Reconnect the battery negative cable. Turn the ignition switch to the On position. Check for 5 volts at the radio control mux circuit cavities of the steering wheel wire harness connectors for both remote radio switches. If OK, go to  4. If not OK, repair the open or shorted radio control mux circuit as required.
4. Disconnect and isolate the battery negative cable. Disconnect the 22-way instrument panel wire harness connector from the CCN. Check for continuity between the remote radio switch ground circuit cavities of the steering wheel wire harness connectors for both remote radio switches and a good ground. There should be no continuity. If not OK, repair the shorted remote radio switch ground circuit as required.