B0000

DTC B0000

Diagnostic Instructions

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

DTC Descriptor

DTC B0000 5A
- Vehicle Speed Information Circuit Plausibility Failure

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

DTC B0000 5A will set when one or both of the following conditions are present:

* 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

No action taken when DTC sets.

Conditions for Clearing the DTC

* The condition responsible for setting the DTC no longer exists.
* A history DTC will clear once 100 consecutive malfunction-free ignition cycles have occurred.

Circuit/System Testing

1. Ignition OFF, disconnect the X4 harness connector at the radio.
2. Ignition ON, verify that a test lamp does not illuminate between the vehicle speed sensor signal circuit terminal 5 and ground.

^ If the test lamp illuminates, test the signal circuit for a short to voltage. If the circuit tests normal, replace the EBCM.

3. Ignition OFF, verify that a test lamp illuminates between the vehicle speed sensor signal circuit terminal 5 and B+.

^ If the test lamp does not illuminate, test the signal circuit for an open/high resistance. If the circuit tests normal, replace the EBCM.

4. Ignition OFF, disconnect the harness connector at the EBCM.
5. Ignition OFF, verify that a test lamp does not illuminate between the vehicle speed sensor signal circuit terminal 3 and B+.

^ If the test lamp illuminates, test the signal circuit for a short to ground.

6. If all circuits test normal, replace the radio.

Repair Instructions

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