B0000

DTC B0000

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.

DTC Descriptor
DTC B0000 5A
- Vehicle Speed Information Circuit Plausibility Failure

Diagnostic Fault Information





Circuit/System Description

The radio receives a vehicle speed signal from the electronic brake control module (EBCM) in order to correlate actual vehicle speed to the movement of the vehicle calculated by the navigation system and reported serial data.

Conditions for Running the DTC

* Radio ON.
* Battery voltage must be between 9-16 volts.

Conditions for Setting the DTC

The DTC will set for one or more of the following conditions.

* Vehicle speed from serial data is more than 5 km/h (3 mph) and vehicle speed pulse from the EBCM is 0 km/h (0 mph).
* Vehicle speed calculated from the navigation processing software is more than 36 km/h (22 mph) and vehicle speed pulse from the EBCM is 0 km/h (0 mph) for 10 seconds continuously.

Action Taken When the DTC Sets

* Turn by turn route navigation may be inoperative.
* Vehicle indicated location may be inaccurate.

Conditions for Clearing the DTC

* The condition must be corrected.
* A history DTC clears after 100 malfunction-free ignition cycles.

Reference Information
Schematic Reference

* Radio/Navigation System Schematics (Radio/Navigation System Schematics)
* Antilock Brake System Schematics (Electrical Diagrams)

Connector End View Reference

Component Connector End Views (Connector End Views By Name)
Description and Operation

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

* Circuit Testing (Circuit Testing)
* Connector Repairs (Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (Wiring Repairs)

Scan Tool Reference

Control Module References (Programming and Relearning)for scan tool information

Circuit/System Testing

Important: Diagnose any antilock brake system (ABS) related DTCs before performing this diagnostic.


1. Ignition OFF, disconnect the radio harness connector X3. Connect a DMM to the vehicle speed signal (VSS) circuit terminal 5 and ground.
2. Ignition ON, operate the vehicle drive wheels at 5 mph. Verify 3-7 Hertz on the VSS circuit.

• If the reading is not as specified, test the VSS circuit for an open, high resistance, short to ground or short to voltage. If the circuit tests normal replace the EBCM.

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

Repair Instructions

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

Control Module References (Programming and Relearning)for radio or EBCM replacement, setup, and programming