Poor Or No AM/FM Audio Reception - BUX
POOR OR NO AM/FM AUDIO RECEPTION - BUX
Special Tools:
For a complete wiring diagram, refer to the Wiring Information.
NOTE:
There are two versions of the POOR OR NO AM/FM AUDIO RECEPTION test. In order to select the proper test you must know if the vehicle is equipped with a mast antenna mounted on the fender. If the vehicle is equipped with a mast antenna mounted on the fender use the POOR OR NO AM/FM AUDIO RECEPTION test. If the vehicle is not equipped with a mast antenna mounted on the fender use the POOR OR NO AM/FM AUDIO RECEPTION-BUX test.
Diagnostic Test
1. CHECK THE ANTENNA CONNECTION
1. Turn the ignition off.
2. Disconnect the white Radio harness connector at the back of the Radio.
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. CHECK THE RADIO
1. Connect the (9977-6-FM) to the white Radio 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. Radio - 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. Reconnect the white Radio harness connector.
3. Lower the right rear section of the headliner to gain access to the Antenna Module. Radio Antenna Module - Removal.
4. Disconnect the Antenna Module white AM/ FM audio connector and connect the (9977-6-FM) to the harness connector.
5. Place the test Antenna base on the roof of the vehicle.
6. Turn the ignition on.
7. Drive the vehicle outside to an un-obstructed area.
8. 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
- Check the connector from the Antenna Module to the Rear Glass Integral Antenna (grid) connector and the grid itself and repair if necessary. Testing and Inspection If the grid checks good, replace the Antenna Module. Radio Antenna Module - Removal
- Perform the BODY VERIFICATION TEST. Body Verification Test. If the grid checks good, replace the Antenna Module. Radio Antenna Module - Removal
4. TEST THE 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 Module.
4. Disconnect the white 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 Antenna Module.
- Perform the BODY VERIFICATION TEST. Body Verification Test.
No
- Go To 5
5. TEST THE ANTENNA CABLE FROM THE RADIO TO INLINE CONNECTOR
1. Locate the Audio Antenna inline connector and disconnect it.
2. Connect the appropriate (9977-6-4) (1) or (9977-6-2) (1) to the side of the Antenna cable (2) that leads to the Radio.
3. Measure the resistance across the tool terminals.
Is the resistance between 47.5 and 52.5 Ohms?
Yes
- Go To 6
No
- Replace the section of Antenna cable from the Radio to the inline connector.
- Perform the BODY VERIFICATION TEST. Body Verification Test.
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 Radio.
2. Disconnect the appropriate (9977-6-4) (1) or (9977-6-2) (1) from the side of the Antenna cable (2) that leads to the Radio.
3. Connect the appropriate (9977-6-4) (1) or (9977-6-2) (1) to the side of the Antenna cable (2) that leads to the Antenna Module.
4. Connect the appropriate (9977-6-1) (1) or (9977-6-3) (1) to the Antenna cable (2) at the Antenna Module.
5. 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 the Antenna Module.
- Perform the BODY VERIFICATION TEST. Body Verification Test.
No
- Replace the section of Antenna cable from the inline connector to the Antenna Module.
- Perform the BODY VERIFICATION TEST. Body Verification Test.