B0001

DTC B0001

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.



DTC Descriptor
DTC B0001
- Vehicle Speed Information Circuit Range/Performance




Circuit/System Description

The navigation radio receives the vehicle speed signal from the powertrain control module (PCM) through a dedicated circuit shared with the instrument cluster.


Conditions for Running the DTC

* The navigation radio must detect a power mode transition to ON.
* The radio does not set this DTC if B1327 or B1328 is current.
* The vehicle must drive for 4 km (2.5 mph) after receiving a global positioning system (GPS) signal.



Conditions for Setting the DTC

The navigation radio compares the vehicle speed signal from the PCM to the GPS location signal every second. If the GPS signal indicates that the vehicle has traveled 4 km (2.5 mph) but no vehicle speed signal was received, the radio sets the DTC.


Action Taken When the DTC Sets

The navigation radio uses the GPS signal when the vehicle speed signal from the PCM is unavailable.


The following symptoms may happen if the vehicle speed signal from the PCM is unavailable:

* The vehicle icon may jump to different positions on the map screen.
* The vehicle icon, current position marker may not move on the map screen while the vehicle is being driven.
* The route guidance accuracy may be degraded.



Conditions for Clearing the DTC

* A current DTC clears when the navigation radio detects the vehicle speed signal from the PCM for more than one second.
* A history DTC clears after 50 ignition cycles without a vehicle speed signal failure.



Reference Information
Schematic Reference

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

Component Connector End Views (Connector Views)
Description and Operation

Radio/Audio System Description and Operation (Radio/Audio 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

1. Test drive the vehicle. Verify the vehicle speedometer is operating properly.

• If the speedometer is inaccurate or inoperative, go to Instrument Cluster Gages Inoperative (Instrument Cluster Gages Inoperative) .

2. Test or repair open circuit on the vehicle speed sensor circuit to the radio.

• If all circuits test normal, replace the PCM.




Repair Instructions

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

* for EBCM (no) replacement, setup, and programming
* Control Module References (Programming and Relearning)forPCM replacement, setup, and programming