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Chevrolet Silverado / GMC Sierra. Manual - part 2435
replace the IPC.
Repair Procedures
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for IPC replacement, setup, and programming
TACHOMETER 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 engine speed based on the information from the
engine control module (ECM). The ECM converts the data from the engine speed sensor to a 2
pulses/engine revolution signal. The ECM sends the engine speed information via high speed
GMLAN serial data circuit to the body control module (BCM). The BCM then sends the
information via low speed GMLAN to the IPC to order to display the engine speed.
Reference Information
Schematic Reference
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
2008 Chevrolet Silverado 1500
2008 ACCESSORIES & EQUIPMENT Displays and Gages - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &
Silverado
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
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