Chevrolet Silverado / GMC Sierra. Service manual — part 2218

The identification of the control modules which command the system

The ability of the control modules to communicate through the serial data circuit

The identification of any stored DTCs and their status

The use of the Diagnostic System Check - Vehicle will identify the correct procedure for
diagnosing the system and where the procedure is located.

DTC B0000

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 B0000 5A

Vehicle Speed Information Circuit Plausibility Failure

Diagnostic Fault Information

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

The DTC will set for one or more of the following conditions.

Circuit

Short to

Ground

Open/High

Resistance

Short to

Voltage

Signal

Performance

Vehicle Speed Signal

B0000 5A

B0000 5A

B0000 5A

B0000 5A

2008 Chevrolet Silverado 1500

2008 ACCESSORIES & EQUIPMENT Cellular, Entertainment, and Navigation - Cab & Chassis Sierra, Cab & Chassis

Silverado, Sierra & Silverado

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

Turn by turn route navigation may be inoperative.

Vehicle indicated location may be inaccurate.

Conditions for Clearing the DTC

The condition responsible for setting the DTC no longer exists.

A history DTC clears after 100 malfunction-free ignition cycles.

Reference Information

Schematic Reference

Radio/Navigation System Schematics

Antilock Brake System Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Navigation System Description and Operation

Electrical Information Reference

Circuit Testing

Connector Repairs

Testing for Intermittent Conditions and Poor Connections

Wiring Repairs

Circuit/System Testing

2008 Chevrolet Silverado 1500

2008 ACCESSORIES & EQUIPMENT Cellular, Entertainment, and Navigation - Cab & Chassis Sierra, Cab & Chassis

Silverado, Sierra & Silverado

1. Ignition OFF, disconnect the radio harness connector X4. Connect a DMM to the vehicle

speed signal (VSS) circuit terminal 5 and ground.

2. Ignition ON, operate the vehicle drive wheels at 5 mph. Verify 3-7 Hertz on the VSS

circuit.

If the reading is not as specified, test the VSS circuit for an open, high resistance, short
to ground or short to voltage. If the circuit tests normal replace the EBCM.

3. If the circuit tests normal, replace the radio.

Repair Procedures

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for radio or EBCM replacement, setup, and programming

DTC B1024

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 B1024 11

Circuit Board Temperature Sensor Above Maximum Threshold

Circuit/System Description

The audio amplifier monitors the internal circuitry for excessive temperature. When the amplifier
senses an internal circuitry temperature greater than 95°C (203°F), the amplifier will set DTC
B1024 11 and shut down until the internal circuitry cools below 90°C (194°F).

Conditions for Running the DTC

Radio ON.

Battery voltage must be between 9-16 volts.

IMPORTANT: Diagnose any antilock brake system (ABS) related DTCs before

performing this diagnostic.

2008 Chevrolet Silverado 1500

2008 ACCESSORIES & EQUIPMENT Cellular, Entertainment, and Navigation - Cab & Chassis Sierra, Cab & Chassis

Silverado, Sierra & Silverado

Conditions for Setting the DTC

DTC B1024 11 will set when the audio amplifier detects an over-heat condition greater than 95°
C (203°F) of the internal amplifier circuitry.

Action Taken When the DTC Sets

The audio amplifier will shut down and all speakers will be inoperative.

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.

Diagnostic Aids

Extended use or extremely high volume especially in warm weather conditions may cause this
DTC to set. Under these conditions it may be normal for this DTC to set to prevent permanent
damage to the audio amplifier circuitry.

Reference Information

Schematic Reference

Radio/Navigation System Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Radio/Audio System Description and Operation

Electrical Information Reference

Circuit Testing

Connector Repairs

Testing for Intermittent Conditions and Poor Connections

Wiring Repairs

2008 Chevrolet Silverado 1500

2008 ACCESSORIES & EQUIPMENT Cellular, Entertainment, and Navigation - Cab & Chassis Sierra, Cab & Chassis

Silverado, Sierra & Silverado