Chevrolet Silverado / GMC Sierra. Manual — part 2430
the circuit tests normal and the DLIS circuit fuse is open, test the signal circuit
terminal 5 for a short to ground.
3. Verify the scan tool Key In Ignition Status parameter is Key Out.
If not the specified value, test the signal circuit terminal 5 for a short to voltage. If the
circuit tests normal, replace the BCM.
4. Install a 3A fused jumper wire between the signal circuit terminal 5 and the B+ circuit
terminal 4. Verify the scan tool Key in Ignition Status parameter is Key In.
If not the specified value, test the signal circuit for an open/high resistance. If the
circuit tests normal, replace the BCM.
5. If all circuits test normal, test or replace the ignition switch.
Repair Procedures
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Ignition and Start Switch Replacement
Control Module References for the BCM replacement, setup, and programming
COMPASS MALFUNCTION (MIRROR)
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 inside rearview mirror (ISRVM) uses 2 magnetic field sensors for compass direction. One
sensor is for north and south, the other is for east and west. As the vehicle travels with or against
the earths magnetic pull, there will be a change in voltage on one or both sensors. As a result of
the change in voltage, the ISRVM changes the heading on the compass display. The internal fault
detection for the compass is handled by the ISRVM.
Reference Information
Schematic Reference
Instrument Cluster Schematics
Inside Rearview Mirror Schematics
2008 Chevrolet Silverado 1500
2008 ACCESSORIES & EQUIPMENT Displays and Gages - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &
Silverado
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
1. Ignition ON, compass ON, verify that there is a compass reading on the display.
If the display is blank, replace the ISRVM.
If the display shows the letter C or CAL, perform the compass calibration procedure.
Refer to Compass Calibration and Magnetic Variance.
2. Verify that the compass reading on the display is correct.
If not correct, perform the compass magnetic variation adjustment procedure. Refer to
Compass Calibration and Magnetic Variance.
3. If the display is still incorrect, replace the ISRVM.
Repair Procedures
Perform the Diagnostic Repair Verification
Control Module References for ISRVM replacement, setup and programming
DRIVER INFORMATION CENTER (DIC) SWITCH MALFUNCTION
Diagnostic Instructions
2008 Chevrolet Silverado 1500
2008 ACCESSORIES & EQUIPMENT Displays and Gages - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &
Silverado
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.
Diagnostic Fault Information
Circuit/System Description
The driver information switches are normally open momentary switches. Power is provided to the
driver information center (DIC) switches via the instrument panel cluster (IPC). The IPC
interfaces with the DIC switches via 3 discreet circuits. The switch input to the cluster is pulled
low or grounded when a switch is activated. The IPC reads the voltage at the analog input to
determine which switch(es) is pressed. The switch input to the cluster is set up in a resistor ladder
format for three of the four switches. The DIC switches include the PERSONALIZATION,
SET/RESET, TRIP/FUEL, AND VEHICLE INFO switches. A stuck switch or a short to battery
sets a DTC.
Reference Information
Schematic Reference
Instrument Cluster Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
Instrument Cluster Description and Operation
Automatic Day-Night Mirror Description and Operation
Electrical Information Reference
Circuit Testing
Circuit
Short to
Ground
Open/High
Resistance
Short to
Voltage
Signal
Performance
DIC Switch Signal
1
1
B3567 01
B3567 59
1. Driver Information Center (DIC) Switch Inoperative
2008 Chevrolet Silverado 1500
2008 ACCESSORIES & EQUIPMENT Displays and Gages - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &
Silverado
Connector Repairs
Testing for Intermittent Conditions and Poor Connections
Wiring Repairs
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the DIC switch assembly.
2. Ignition OFF, test for less than 1 ohm between the low reference terminal 2 and ground.
If greater than the specified range, test the low reference circuit for an open/high
resistance.
3. Ignition OFF, test for less than 1 ohm between the ground terminal 5 and ground.
If greater than the specified range, test the ground circuit for an open/high resistance.
4. Ignition ON, verify that all of the scan tool DIC Switch parameters are Inactive.
If any are not Inactive, test the appropriate signal circuit terminal 1 or terminal 3 for a
short to ground. If the circuit tests normal, replace the IPC.
5. Ignition ON, install a 3-amp fused jumper wire between the signal circuit terminal 1 and the
low reference circuit terminal 2. Verify the scan tool DIC Switch parameters, except the
DIC Fuel Info. parameter, are Active.
If any are not Active, test the signal circuit for a short to voltage or an open/high
resistance. If the circuit tests normal, replace the IPC.
6. Ignition ON, install a 3-amp fused jumper wire between the signal circuit terminal 3 and
ground. Verify the scan tool DIC Fuel Info. parameter is Active.
If not Active, test the signal circuit for a short to voltage or and open/high resistance. If
the circuit tests normal, replace the IPC.
7. If all the circuits test normal, test or replace the DIC switch assembly.
Repair Procedures
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Driver Information Display Switch Replacement (without RPO SLT) or Driver
Information Display Switch Replacement (with RPO SLT)
Control Module References for IPC replacement, setup, and programming
2008 Chevrolet Silverado 1500
2008 ACCESSORIES & EQUIPMENT Displays and Gages - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &
Silverado
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