Identifying Concerns

In order to isolate the source of the noise/poor reception, identify the ignition switch position that the concern is most noticeable.

1. Turn the ignition switch to the accessory position.
2. Turn ON the radio.
3. Seek up 88 to 108 FM then 550 to 1600 AM.
4. Record the number of valid radio stations where the tuner stops.
5. Listen for various noise problems.

Repeat these steps with the ignition switch in the ON position. Then repeat these steps again but with the engine running.

1. Return the ignition switch to the position that the concern was most noticeable.
2. Remove fuses or circuit breakers one at a time until the noise has been eliminated.
3. Identify what systems or components are powered by the fuse.
4. Reinstall all fuses and circuit breakers.
5. Disconnect the components powered by the fuse one at a time until the concern has been eliminated.
6. Refer to corrective action for tips on eliminating noise concerns.

For noise concerns not identified using prior procedure, perform the following.

1. Turn the ignition switch to the position the concern was most noticeable.
2. Turn ON the radio.
3. Slowly remove the radio from the mounting bracket.
4. If noise is greatly reduced, the noise is most likely caused by wiring harnesses or hoses behind or on top of radio or antenna coax cable. The harness or hoses need to be rerouted or wrapped with aluminum or nickel tape to shield. Refer to corrective action for additional tips on eliminating noise concerns.

For noise concerns not identified using prior procedure, perform the following:

1. Turn the ignition switch to the position the concern was most noticeable.
2. Turn ON the radio.
3. Remove the radio and unplug the antenna coax cable from the radio.
4. If noise is eliminated, the noise is most likely caused by a degraded antenna system (poor antenna ground plane, radio case ground or corrosion at antenna coax cable connection). Refer to Radio Poor Reception .
5. Other causes include defective relays, solenoids or switches. Refer to corrective action for additional tips on eliminating noise concerns.