Navigation System - Vehicle Position Indicator Inoperative or Erratic

Navigation System - Vehicle Position Indicator Inoperative or Erratic

Diagnostic Instructions

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



Circuit Description

The vehicle speed signal (VSS) circuit from the instrument cluster to the navigation radio provides vehicle speed information to the radio for the purpose of updating the vehicle position indicator on the navigation screen.


Reference Information
Schematic Reference

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

Component Connector End Views (Component Connector End 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

Programming and Relearning (Programming and Relearning)for scan tool information


Circuit/System Verification

Radio ON, press the NAV button to switch to the navigation screen on the radio. Drive the vehicle for at least 15 seconds at greater than 15 mph. Verify that the navigation screen shows that the vehicle is moving.


Circuit/System Testing

1. Ignition OFF, disconnect connector X2 at the radio.
2. Test for the vss signal between terminal E and ground while driving the vehicle.

• If the vss signal is not present test the vss circuit for an open.

3. If the circuit tests normal, replace the radio.



Repair Instructions

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


See Programming and Relearning (Programming and Relearning) for Radio replacement, setup, and programming