Diagnostic Test

WARNING: This page is about a different car, the 2017 Jeep Cherokee. However, it is still accessible from the selected car via links, so may be relevant.

CHECK THE ANTENNA CONNECTION
1. Turn the ignition off.
2. Disconnect the Radio C3 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. Refer to BODY VERIFICATION TEST .
RADIO
1. Connect the (special tool #9977-6-FM, Antenna) to the Radio C3 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.
6. Note any of the following type of reception concerns being heard:
  - Silence
  - Static
  - Noise
  - Popping
  - Screeching
  - Hissing
  - Crackling
  - Humming
  - Weak Signal
  - Interference
  - Motor Sound
  Is the audio reception still poor or not available?
  
  Yes
  - Replace the Radio in accordance with the Service Information.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Go To 3
ANTENNA
1. Turn the ignition off.
2. Reconnect the Radio C3 harness connector.
3. Disconnect the Radio Antenna harness connector.
4. Connect the (special tool #9977-6-FM, Antenna) to the Radio Antenna harness connector.
5. Turn the Radio on and select several different known good stations from the AM and FM bands.
6. Note any of the following type of reception concerns being heard:
  - Silence
  - Static
  - Noise
  - Popping
  - Screeching
  - Hissing
  - Crackling
  - Humming
  - Weak Signal
  - Interference
  - Motor Sound
  Is the audio reception still poor or not available?
  
  Yes
  - Go To 4
  No
  - Replace the Radio Antenna in accordance with the Service Information.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
TEST THE ANTENNA MODULE
1. Turn the ignition off.
2. Disconnect the test antenna and connect the harness connector to the Radio.
3. Disconnect the antenna module white AM/ FM audio fakra connector.
4. Connect the (special tool #9977-6-FM, Antenna) to the harness connector.
5. Turn the ignition on.
6. Turn the Radio on and set it to AM or FM band.
7. Tune in to several AM and FM stations.
  Is the audio reception still poor or not available?
  
  Yes
  - Go To 5
  No
  - Replace the Antenna Module in accordance with the Service Information. Refer to MODULE, RADIO ANTENNA, REMOVAL .
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .

ANTENNA CABLE

Courtesy of CHRYSLER GROUP, LLC

Turn the ignition off.
Disconnect the (special tool #9977-6-FM, Antenna) from the Radio Antenna harness connector.

Connect the appropriate (special tool #9977-6-4, Jumper) (1) or (special tool #9977-6-2, Jumper) (1) to the Radio Antenna harness connector (2) at the Antenna.

Courtesy of CHRYSLER GROUP, LLC

Disconnect the Radio C3 harness connector.
Connect the appropriate (special tool #9977-6-1, Adapter) (1) or (special tool #9977-6-3, Adapter) (1) to the Radio C3 harness connector (2).
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. Refer to BODY VERIFICATION TEST .
No
- Replace the Antenna Cable in accordance with the Service Information.
- Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .