Chevrolet Silverado / GMC Sierra. Service 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