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Chevrolet Silverado / GMC Sierra. Manual - part 2429
Air Bag Indicator Circuit Malfunction
Passenger Presence System Indicator Circuit Malfunction
Seat Belt Indicator Circuit Malfunction - Driver
Seat Belt Indicator Circuit Malfunction - Passenger
Security Indicator Malfunction
Outside Air Temperature Display Inaccurate or Inoperative
Instrument Cluster Dimming
Interior Backlighting Malfunction (w/AN3) or Interior Backlighting Malfunction (w/o
AN3)
Driver Information Center (DIC)
Driver Information Center (DIC) Switch Malfunction
Audible Warnings
Chime Malfunction
CHARGE INDICATOR MALFUNCTION
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 engine control module (ECM) uses the generator turn ON signal circuit to control the load of
the generator on the engine. A high side driver in the ECM applies a voltage to the voltage
regulator. This signals the voltage regulator to turn the field circuit ON and OFF. The ECM
monitors the state of the generator turn ON signal circuit. The ECM should detect low voltage on
the generator turn on signal circuit when the ignition is ON and the engine is OFF, or when the
charging system malfunctions. With the engine running, the ECM should detect high voltage on
the generator turn on signal circuit. The ECM performs key ON and RUN tests to determine the
status of the generator turn on signal circuit. If a malfunction is detected the ECM will illuminate
the charge indicator in the instrument panel cluster (IPC).
Reference Information
2008 Chevrolet Silverado 1500
2008 ACCESSORIES & EQUIPMENT Displays and Gages - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &
Silverado
Schematic Reference
Instrument Cluster Schematics
Starting and Charging Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
Instrument Cluster Description and Operation
Charging System 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, engine running, verify the scan tool Battery Voltage parameter is between 12.5
and 15.5 volts.
If not within the specified range, refer to Charging System Test .
2. Ignition ON, perform the display test with the scan tool. The charge indicator should turn
ON and OFF when changing between the commanded states.
If the indicator does not turn ON and OFF between commanded states, replace the
IPC.
Repair Procedures
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for the IPC replacement, setup, and programming
2008 Chevrolet Silverado 1500
2008 ACCESSORIES & EQUIPMENT Displays and Gages - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &
Silverado
CHIME MALFUNCTION
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.
Diagnostic Fault Information
Circuit/System Description
The radio generates the audible warning through the left speaker. The radio receives audible
warning requests via the serial data circuit from the instrument panel cluster (IPC) or the body
control module (BCM).
Reference Information
Schematic Reference
Instrument Cluster Schematics
Audible Warnings Schematics
Body Control System Schematics
Radio/Navigation System Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
Audible Warnings Description and Operation
Electrical Information Reference
Circuit
Short to
Ground
Open/High
Resistance
Short to
Voltage
Signal
Performance
Key In Ignition B+
-
1
-
-
Key In Ignition Signal
1
1
1
-
1. Chime Malfunction
2008 Chevrolet Silverado 1500
2008 ACCESSORIES & EQUIPMENT Displays and Gages - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &
Silverado
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, headlamp switch OFF, verify the scan tool Headlamp Switch ON parameter is
Inactive.
If not Inactive, refer to Headlamps Malfunction .
2. Ignition ON, park lamp switch OFF, verify the scan tool Park Lamp Switch parameter is
Inactive.
If not Inactive, refer to Park, License, and/or Tail Lamps Malfunction .
3. Ignition ON, doors closed, verify the scan tool Door Ajar Switch parameters are
Inactive/Door Closed.
If not Inactive/Door Closed, refer to Courtesy Lamps Malfunction (w/AN3) or
Courtesy Lamps Malfunction (w/o AN3) .
4. Ignition ON, radio ON, adjust the radio balance and fade to the left front speaker.
If the speaker does not operate properly, refer to Speaker Malfunction .
5. Verify that the Key In Ignition Status parameter is Key In when the key is in the ignition and
Key Out when the key is out of the ignition.
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the ignition switch.
2. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal 4 and
ground.
If the test lamp does not illuminate, test the B+ circuit for an open/high resistance. If
IMPORTANT: Before performing this diagnostics, make sure no indicator(s) are
illuminated after the IPC performs the displays test. If any
indicators are illuminated after the bulb test, perform the
indicator diagnostics before this diagnostic.
2008 Chevrolet Silverado 1500
2008 ACCESSORIES & EQUIPMENT Displays and Gages - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &
Silverado
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