Diagnostic Instructions
| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
| • | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
DTC Descriptor
DTC B0001: Vehicle Speed Information Circuit Range/PerformanceDiagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Vehicle Speed Signal Circuit | P0608* | P0608* | P0608* | B0001 |
*. Speedometer and/or Odometer Inaccurate or Inoperative | ||||
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 data. 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 1 second. |
| • | A history DTC clears after 50 ignition cycles without a vehicle speed signal failure. |
Reference Information
Schematic Reference
Connector End View Reference
Description and Operation
Navigation System Description and Operation
Electrical Information Reference
Circuit/System Testing
Important: Diagnose any antilock brake system (ABS) related DTCs before performing this diagnostic.
- Ignition OFF, disconnect the radio harness connector C2.
- Ignition ON, operate the vehicle drive wheels at 5 mph. Test for 3-7 Hertz between the VSS circuit terminal 7 and ground.
- If the circuit tests normal, replace the radio.
| ⇒ | If not within the specified range, test the VSS circuit for an open, high resistance, short to ground or short to voltage. If the circuit tests normal replace the PCM. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for Radio or EBCM replacement, setup, and programming
