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

The radio is in ACCESSORY, RUN, or RAP power mode.

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.

Conditions for Clearing the DTC

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

Circuit/System Testing

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

1. Ignition OFF, disconnect the radio harness connector X4. Connect a DMM to the vehicle speed signal (VSS) circuit terminal 5 and ground. Verify 3-7 Hertz with the drive wheels moving at 5 mph.

• If the VSS is present, replace the radio.

2. Ignition OFF, disconnect the EBCM harness connector and X4 radio harness connector.
3. Test for less than 1 volt between the EBCM harness connector appropriate terminal and radio harness connector X4 terminal 5.

* Terminal 28 (10 Series without JL4)
* Terminal 14 (20/30 Series without JL4)
* Terminal 11 (10 Series With JL4)
* Terminal 32 (20/30 Series With JL4)

• If greater than specified value repair short to voltage.

4. Test for infinite resistance between the radio harness connector X4 terminal 5 and ground.

• If less than specified value repair short to ground.

5. Test for less than 1 ohm between the EBCM harness connector appropriate terminal and radio harness connector X4 terminal 5.

• If greater than specified value repair open circuit.

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

Repair Instructions

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