Poor Or No AM/FM Audio Reception

POOR OR NO AM/FM AUDIO RECEPTION

Special Tools:










For a complete wiring diagram, refer to the Wiring Information.






1. CHECK THE ANTENNA CONNECTION
1. Turn the ignition off.
2. Disconnect the Radio C4 harness connector.
3. Inspect the Audio Antenna harness connection.

Is the Antenna connection clean and secure?

Yes

- Go To 2

No

- Repair the Antenna connection as needed.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

2. RADIO
1. Connect the (9977-6-FM) to the Radio C4 component connector.
2. Place the test antenna base on the roof of the vehicle.
3. Turn the ignition on.
4. Drive the vehicle outside to an un-obstructed area.
5. Turn the Radio on and select several different known good stations from the AM and FM bands.

Is the audio reception still poor or not available?

Yes

- Replace the Radio.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

No

- Go To 3

3. ANTENNA
1. Turn the ignition off.
2. Reconnect the Radio C4 harness connector.
3. Disconnect the Radio Antenna harness connector.
4. Connect the (9977-6-FM) to the Radio Antenna harness connector.
5. Turn the Radio on and select several different known good stations from the AM and FM bands.

Is the audio reception still poor or not available?

Yes

- Go To 4

No

- Replace the Radio Antenna.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

4. ANTENNA CABLE




1. Turn the ignition off.
2. Disconnect the (9977-6-FM) from the Radio Antenna harness connector.
3. Connect the appropriate (9977-6-4) (1) or (9977-6-2) (1) to the Radio Antenna harness connector (2) at the Antenna.





4. Disconnect the Radio C4 harness connector.
5. Connect the appropriate (9977-6-1) (1) or (9977-6-3) (1) to the Radio C4 harness connector (2).
6. Measure the resistance across the tool terminals.

Is the resistance between 47.5 and 52.5 Ohms?

Yes

- The source of the poor reception is not caused by the Radio, Antenna Cable or Radio Antenna.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

No

- Replace the Antenna Cable.
- Perform the BODY VERIFICATION TEST. Body Verification Test.