Chevrolet Silverado / GMC Sierra. Manual — part 2435

Testing for Intermittent Conditions and Poor Connections

Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

Ignition ON, perform the tachometer gage sweep test with the scan tool. Verify that the
tachometer gage sweeps from its low to high position.

If the tachometer gage does not sweep from its low to high position, replace the IPC.

Repair Procedures

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for IPC replacement, setup, and programming

VOLT GAGE INACCURATE OR INOPERATIVE

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.

Circuit/System Description

The instrument panel cluster (IPC) displays the vehicle voltage based on the information from the
body control module (BCM). The BCM provides voltage information to the IPC via serial data.

Diagnostic Aids

The voltmeter may fluctuate between 12 and 14 volts. This is normal operation. For further
information, refer to Charging System Description and Operation or refer to Voltmeter Gage
under the Instrument Panel section in the owners manual.

Reference Information

Schematic Reference

2008 Chevrolet Silverado 1500

2008 ACCESSORIES & EQUIPMENT Displays and Gages - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &

Silverado

Instrument Cluster Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Instrument Cluster Description and Operation

Electrical Information Reference

Circuit Testing

Connector Repairs

Testing for Intermittent Conditions and Poor Connections

Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

Ignition ON, perform the volt gage sweep test with the scan tool. Verify that the volt gage sweeps
from its low to high position.

If the volt coolant gage does not sweep from its low to high position, replace the IPC.

Repair Procedures

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for IPC replacement, setup, and programming

REPAIR INSTRUCTIONS

DRIVER INFORMATION DISPLAY SWITCH REPLACEMENT (WITHOUT RPO SLT)

2008 Chevrolet Silverado 1500

2008 ACCESSORIES & EQUIPMENT Displays and Gages - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &

Silverado

Fig. 6: View Of Instrument Panel Trim Plate & Drivers Information Center Switch
Assembly
Courtesy of GENERAL MOTORS CORP.

Callout

Component Name

1

Instrument Panel Trim Plate
Refer to Instrument Panel Trim Plate Replacement (Without RPO SLT)

2

Drivers Information Center Switch Assembly
Tip: Release the retaining tabs securing the Switch to the instrument panel trim
plate.

2008 Chevrolet Silverado 1500

2008 ACCESSORIES & EQUIPMENT Displays and Gages - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &

Silverado