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 AM/FM Audio Antenna white connector at the rear of the Telematics Gateway Module (TGW). Telematics Gateway Module - Removal.
3. Inspect the Audio Antenna 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. CHECK THE TGW
1. Connect the (9977-6-FM) to the antenna connection on the back of the TGW.
2. Place the magnetic test antenna on the roof of the vehicle.
3. Turn the ignition on.
4. Turn the TGW on and set it to AM or FM band.
5. Tune in to several AM and FM stations.

Is the audio reception still poor or not available?

Yes

- Replace the TGW. Telematics Gateway Module - Removal.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

No

- Go To 3

3. TEST THE ANTENNA MODULE AND GRID
1. Turn the ignition off.
2. Disconnect the test antenna and connect the harness connector to the TGM.




3. Remove the right C-Pillar trim to gain access to the Antenna Module (3). C-Pillar Trim Panel - Removal.Remove the mounting bolt holding the Antenna Module (1).
4. Disconnect the white AM/FM antenna cable connector (2) from the antenna module.
5. Connect the (9977-6-FM) to the white AM/FM antenna cable harness connector.

6. Turn the ignition on.
7. Turn the TGW on and set it to AM or FM band.
8. Tune in to several AM and FM stations.

Is the audio reception still poor or not available?

Yes

- Go To 4

No

- Check the antenna grid and repair if necessary. Testing and Inspection. If the grid checks good, replace the Antenna Module.

4. TEST THE ANTENNA CABLE
1. Turn the ignition off.
2. Disconnect the (9977-6-FM) from the Antenna cable.




3. Connect the appropriate 50 Ohm test (9977-6-4) (1) or (9977-6-2) (1) to the Antenna cable (2) at the Antenna Module harness connector.

4. Disconnect the AM/FM Audio Antenna white connector at the rear of the Telematics Gateway Module (TGW).
5. Connect the appropriate (9977-6-1) (1) or (9977-6-3) (1) to the antenna cable (2) at the back of the TGW.




6. Measure the Resistance across the tool terminals.

Is the resistance above 52.5 or below 47.5 Ohms?

Yes

- Go To 5

No

- The source of the poor reception is not caused by the TGW or the Antenna cable. Re-check the antenna grid and repair if necessary. Testing and Inspection. If the grid checks good, replace the Antenna Module.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

5. TEST THE ANTENNA CABLE FROM THE TGW TO INLINE CONNECTOR
1. Disconnect the appropriate (9977-6-4) or (9977-6-2) from the antenna cable at the Antenna Module connector.
2. Remove the Glove Box Assembly. Instrument Panel Glove Box - Removal.
3. Disconnect the white AM/FM antenna connector mounted on the blower housing.
4. Connect the appropriate 50 Ohm test (9977-6-4) (1) or (9977-6-2) (2) to the side of the Antenna cable (2) that leads to the TGW.




5. Measure the Resistance across the tool terminals.

Is the resistance above 52.5 or below 47.5 Ohms?

Yes

- Replace the antenna cable from the TGW to inline connector.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

No

- Go To 6

6. TEST THE ANTENNA CABLE FROM THE INLINE CONNECTOR TO THE ANTENNA MODULE
1. Disconnect the appropriate (9977-6-1) or (9977-6-3) from the rear of the TGW.
2. Connect the appropriate (9977-6-1) (1) or (9977-6-3) (1) to the Antenna cable (2) at the Antenna Module connector.




3. Measure the resistance across the tool terminals.

Is the resistance above 52.5 or below 47.5 Ohms?

Yes

- Replace the antenna cable from the inline connector to the Antenna Module.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

No

- The source of the poor reception is not caused by the TGW or the Antenna cable. Re-check the antenna grid and repair if necessary. Testing and Inspection. If the grid checks good, replace the antenna module.
- Perform the BODY VERIFICATION TEST. Body Verification Test.