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Home >> Jeep >> 2017 >> Wrangler Sahara, Automatic Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 63 (Audio/Video - Non-DTC Based Diagnostics) >> Diagnosis And Testing >> Poor Or No GPS Reception >> Diagnostic Test

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

      Is the Antenna connection clean and secure?

      Yes 

      • Go To  2

      No 

      • Repair the GPS Antenna connection as needed.
      • Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  2. CHECK THE RADIO 
    1. Disconnect the GPS Antenna harness connector from the Radio.
    2. Connect the (special tool #9977-6-GPS, Adapter, GPS Antenna Diagnostic) (1) to the Radio at the GPS Antenna connector location.
    3. Place the test antenna base on the roof of the vehicle.
    4. Turn the ignition on.
    5. Turn the Radio on
    6. Drive the vehicle outside in a un-obstructed area.

      Is the 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
  3. CHECK THE ANTENNA 
    1. Turn the Radio off.
    2. Turn the ignition off.
    3. Disconnect the (special tool #9977-6-GPS, Adapter, GPS Antenna Diagnostic) (1) from the Radio.
    4. Reconnect the Radio to the GPS Antenna harness connector.
    5. Disconnect the GPS Antenna harness connector from the GPS Antenna.
    6. Connect the (special tool #9977-6-GPS, Adapter, GPS Antenna Diagnostic) (1) to the GPS Antenna harness connector in place of the GPS Antenna.
    7. Turn the ignition on
    8. Turn the Radio on.
    9. Drive the vehicle outside in a un-obstructed area.

      Is the reception still poor or not available?

      Yes 

      • Go To  4

      No 

      • Replace the GPS Antenna in accordance with the Service Information.
      • Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  4. CHECK THE ANTENNA CABLE 
    GC0143945Courtesy of CHRYSLER GROUP, LLC
    1. Turn the Radio off.
    2. Turn the ignition off.
    3. Disconnect the GPS Antenna harness connector from the Radio.
    4. Connect the appropriate (special tool #9977-6-4, Jumper) (1) or (special tool #9977-6-2, Jumper) (1) to the GPS Antenna harness connector in place of the Radio.
      GC0143944Courtesy of CHRYSLER GROUP, LLC
    5. Connect the appropriate (special tool #9977-6-1, Adapter) (1) or (special tool #9977-6-3, Adapter) (1) to the Jumper.
    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, Satellite Antenna Cable or Satellite Antenna.
      • Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .

      No 

      • Replace the GPS Antenna Cable in accordance with the Service Information.
      • Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
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