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Chevrolet Silverado / GMC Sierra. 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
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