Radio/Stereo: Testing and Inspection

RADIO

WARNING: ON VEHICLES EQUIPPED WITH AIRBAGS, REFER TO RESTRAINTS BEFORE ATTEMPTING ANY STEERING WHEEL, STEERING COLUMN, OR INSTRUMENT PANEL COMPONENT DIAGNOSIS OR SERVICE. FAILURE TO TAKE THE PROPER PRECAUTIONS COULD RESULT IN ACCIDENTAL AIRBAG DEPLOYMENT AND POSSIBLE PERSONAL INJURY.

Any diagnosis of the Audio system should begin with the use of the scan tool.

Refer to the appropriate wiring information.

If the vehicle is equipped with remote radio switches located on the back of the steering wheel spokes, and the problem being diagnosed is related to one of the symptoms listed below, be certain to check the remote radio switches and circuits as described, prior to attempting radio diagnosis or repair.

- Stations changing with no remote radio switch input
- Radio memory presets not working properly
- Volume changes with no remote radio switch input
- Remote radio switch buttons taking on other functions
- CD player skipping tracks
- Remote radio switch inoperative.

CAUTION: The speaker output of the radio is a "floating ground" system. Do not allow any speaker lead to short to ground, as damage to the radio may result.

1. Check the fuse(s) in the junction block and the Integrated Power Module (IPM). If OK, go to STEP 2. If not OK, repair the shorted circuit or component as required and replace the faulty fuse(s).

2. Check for battery voltage at the fuse in the (IPM). If OK, go to STEP 3. If not OK, repair the open circuit to the battery as required.

3. Turn the ignition switch to the ON position. Check for battery voltage at the fuse in the junction block. If OK, go to STEP 4. If not OK, repair the open circuit to the ignition switch as required.

4. Turn the ignition switch to the OFF position. Remove the radio, but do not unplug the wire harness connectors. Check for continuity between the radio chassis and a good ground. There should be continuity. If OK, go to STEP 5. If not OK, repair the open radio chassis ground circuit as required.

5. Connect the battery negative cable. Turn the ignition switch to the ON position. Check for battery voltage at the fused ignition switch output circuit cavity of the radio wire harness connector. If OK, go to STEP 6. If not OK, repair the open circuit as required.

6. Turn the ignition switch to the OFF position. Check for battery voltage at the fused B(+) circuit cavity of the radio wire harness connector. If OK, replace the faulty radio. If not OK, repair the open circuit to the Ignition-Off Draw (IOD) fuse as required.