Chevrolet Silverado / GMC Sierra. Service manual — part 2239

Schematic Reference

Radio/Navigation System Schematics

Connector End View Reference

Component Connector End Views

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 Testing

1. Verify the system works with a known good remote

If the known good remote operates properly, replace the suspect remote.

2. Operate the radio and turn on the rear seat audio (RSA). Verify the remote headphones

operate normally.

If the remote headphones do not operate properly, go to Video Entertainment
System Wireless Headphone Inoperative.

3. Install a scan tool, monitor the button presses in the radio data display. Verify the radio

responds to the remote when the buttons are pressed.

If the radio does not respond, test the remote infra-red signal circuits for an open, short
to ground or short to B+. If the infra-red signal circuits test normal replace audio
system transceiver module.

Repair Procedures

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

IMPORTANT: Test or replace the remote batteries before performing the

circuit/system test.

2008 Chevrolet Silverado 1500

2008 ACCESSORIES & EQUIPMENT Cellular, Entertainment, and Navigation - Cab & Chassis Sierra, Cab & Chassis

Silverado, Sierra & Silverado

Audio System Transceiver Module Replacement

Control Module References for radio replacement, setup, and programming

VIDEO ENTERTAINMENT SYSTEM WIRELESS HEADPHONE 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.

Reference Information

Schematic Reference

Radio/Navigation System Schematics

Connector End View Reference

Component Connector End Views

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 Testing

No Audio From Wireless Headphones

IMPORTANT: Center the balance and fade adjustment on the radio. If

adjustment of the fade and balance eliminates the concern,
review the operation of the radio with the customer.

2008 Chevrolet Silverado 1500

2008 ACCESSORIES & EQUIPMENT Cellular, Entertainment, and Navigation - Cab & Chassis Sierra, Cab & Chassis

Silverado, Sierra & Silverado

1. Turn ON the wireless headphones. Verify the power indicator lamp on the wireless

headphone illuminates.

If the power indicator lamp does not illuminate on the wireless headphones check or
replace the wireless headphone batteries. If the batteries are OK replace the wireless
headphones.

2. Activate the RSA. Set both wireless headphones to the proper channel to hear RSA. Adjust

the volume up on both wireless headphones. Verify that only one set of wireless headphones
operate properly.

If only one set of wireless headphones do not have audio, replace the suspect wireless
headphone set.

3. With a DMM, verify there is B+ at the infra-red module supply voltage circuit when the

RSA is activated.

If B+ is not present, test for a open or short to power on the infra-red module supply
voltage circuit. If the infra-red module supply voltage circuit tests normal, replace the
rear HVAC control module.

4. At the infra-red module connector harness, test for AC voltage between the low reference

circuit and the left and right infra-red audio signal circuits. Verify there is AC voltage with
the RSA activated.

If AC voltage is not present, test for an open, short to ground or short to B+ on the low
reference and both left and right infra-red audio signal circuits. If the low reference
and audio signals test normal replace the rear HVAC control module.

5. Ignition OFF, Disconnect the harness connector of the infra-red module. Test for less than

1.0 ohm between the ground circuit terminal 12 and ground.

If greater than the specified range, repair the ground circuit.

If the ground circuit tests normal, replace the infra-red module.

Audio In One Channel of the Wireless Headphones or Distortion

1. Activate the RSA. Set both wireless headphones to the proper channel to hear RSA. Adjust

the volume up on both wireless headphones. Verify that only one set of wireless headphones
operates properly.

If only one set of wireless headphones is faulty, replace the suspect wireless headphone
set.

IMPORTANT: Center the balance and fade adjustment on the radio. If

adjustment of the fade and balance eliminates the concern,
review the operation of the radio with the customer.

2008 Chevrolet Silverado 1500

2008 ACCESSORIES & EQUIPMENT Cellular, Entertainment, and Navigation - Cab & Chassis Sierra, Cab & Chassis

Silverado, Sierra & Silverado

2. At the infra-red module connector harness, test for AC voltage between the low reference

circuit and the left and right infra-red audio signal circuits. Verify there is AC voltage with
the RSA activated.

If AC voltage is not present, test for an open, short to ground or short to B+ on the low
reference and both left and right infra-red audio signal circuits. If the low reference
and audio signals test normal replace the rear HVAC control module.

3. Test for an open, short to ground or short to B+ on the low reference and both left and right

infra-red audio signal circuits.

If the low reference and audio signals test normal replace the infra-red module.

Repair Procedures

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Audio System Transceiver Module Replacement

REPAIR INSTRUCTIONS

MOBILE TELEPHONE MICROPHONE REPLACEMENT

2008 Chevrolet Silverado 1500

2008 ACCESSORIES & EQUIPMENT Cellular, Entertainment, and Navigation - Cab & Chassis Sierra, Cab & Chassis

Silverado, Sierra & Silverado