• | 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. |
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
---|---|---|---|---|
Vehicle Speed Signal | B0000 5A | B0000 5A | B0000 5A | B0000 5A |
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.
• | Radio ON. |
• | Battery voltage must be between 9-16 volts. |
• | 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. |
• | Turn by turn route navigation may be inoperative. |
• | Vehicle indicated location may be inaccurate. |
• | The condition responsible for setting the DTC no longer exists. |
• | A history DTC clears after 100 malfunction-free ignition cycles. |
Radio/Navigation System Schematics
Navigation System Description and Operation
• | Circuit Testing |
• | Wiring Repairs |
Control Module References for scan tool information
Important: Diagnose any antilock brake system (ABS) related DTCs before performing this diagnostic.
⇒ | 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 EBCM. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for radio or EBCM replacement, setup, and programming