Navigation System - Poor or Inoperative TV Reception

Navigation System - Poor or Inoperative TV Reception

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview)provides an overview of each diagnostic category.



Reference Information
Schematic Reference

Radio/Navigation System Schematics (Radio/Navigation System Schematics)
Connector End View Reference

Component Connector End Views (Connector Views)
Description and Operation

Navigation System Description and Operation (Navigation System Description and Operation)
Electrical Information Reference

* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)

Scan Tool Reference

Control Module References (Programming and Relearning)


Circuit/System Testing

Important: Verify the auxiliary audio or video input device is operating normally before performing this diagnostic.



1. Inspect the TV antenna grid for damage and that each of the TV antennas are connected.

• If damage is found, replace the rear glass.

2. Ignition OFF, disconnect the antenna coaxial cable from the TV antenna module.
3. Verify there is less than 3.5 ohms between each of the TV antenna end coaxial cable center conductor and the TV antenna amplifier end coaxial cable center conductor.

• If greater than specified value, replace the TV antenna coaxial cable.

4. Test each of the following circuits for an open, short to ground, or a short to voltage.

* The video red signal circuits
* The video green signal circuits
* The video blue signal circuits
* The video synchronization signal circuits
* The audio left circuit
* The audio right circuit
* The audio common circuit


• If an open, short to ground, or a short to voltage is found repair the suspect circuit.

5. If all circuits test normal replace the TV antenna module.



Repair Instructions

Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.

* Television Antenna Amplifier Replacement (Service and Repair)
* Television Antenna Module Replacement (Service and Repair)