Symptom Related Diagnostic Procedures
POOR OR NO CELLULAR RECEPTION
Special Tools:
For a complete wiring diagram, refer to the Wiring Information.
Diagnostic Test
1. CHECK THE ANTENNA CONNECTION
1. Turn the ignition off.
2. Disconnect the Radio C7 harness connector.
3. Inspect the Cellular Antenna harness connection.
Is the Antenna connection clean and secure?
Yes
- Go To 2
No
- Repair the Cellular Antenna connection as needed.
- Perform the BODY VERIFICATION TEST. Body Verification Test.
2. RADIO
1. (9977-6-CELL)Connect the (1) to the Radio C7 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.
Is the 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 C7 harness connector.
3. Disconnect the Cellular Antenna harness connector.
4. Connect the (9977-6-CELL) (1) to the Radio C7 component connector.
5. Turn the Radio on and select several different known good APP/ Cellular functions.
Is the reception still poor or not available?
Yes
- Go To 4
No
- Replace the Cellular Antenna.
- Perform the BODY VERIFICATION TEST. Body Verification Test .
4. ANTENNA CABLE
1. Turn the ignition off.
2. Connect the (9977-6-CELL) (1) to the Radio C7 component connector.
3. Connect the appropriate (9977-6-4) (1) or (9977-6-2) (1) to the Cellular Antenna harness connector (2) at the Antenna.
4. Connect the appropriate (9977-6-1) (1) or (9977-6-3) (1) to the Radio C7 harness connector (2).
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 , Cellular Antenna Cable or Cellular Antenna.
- Perform the BODY VERIFICATION TEST. Body Verification Test .
No
- Replace the Cellular Antenna Cable.
- Perform the BODY VERIFICATION TEST. Body Verification Test .