Chevrolet Silverado / GMC Sierra. Service manual — part 2238

If a connection is not made within specified time, go to Component Testing.

5. Hear all messages during the course of the tests available, and contact the General Motors

Technical Assistance Center.

Component Testing

1. Verify that there is no exterior damage to the cellular antenna.

If damaged, test or replace the cellular antenna assembly.

2. Disconnect the cellular antenna coax from the VCIM.

3. Disconnect the cellular antenna coax from the cellular antenna.

4. Test for infinite resistance between the center conductor of the coax and the outer metal

shield.

If different than specified value, replace the cellular antenna coax.

5. Test for less than 1 ohm resistance at the cellular antenna coax center conductor from end to

end.

If greater than specified value, replace the cellular antenna coax cable.

6. Contact the General Motors Technical Assistance Center.

Repair Procedures

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Mobile Telephone Digital Antenna Replacement

VIDEO DISPLAY IS POOR OR BLANK

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

IMPORTANT: Vehicle may be equipped with sectioned coax. Test each section

and replace only the faulty section, not the entire length or coax.

2008 Chevrolet Silverado 1500

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

Silverado, Sierra & Silverado

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

With Third Row Video Screen

1. Flip open the rear video displays. With the ignition ON, operate the rear entertainment

system using several known good DVD disks. Observe the rear video screens.

If both screens turn on but are blank, replace the radio.

2. Note witch screen is malfunctioning. Remove both rear video displays. Swap the positions

of the rear video screens and plug in the harness connectors. Operate the rear entertainment
and observe the rear video screens.

If the malfunctioning screen is not working in a different location, replace the suspect
video screen.

If the malfunctioning screen operates normally in a different location, Test or repair
open, short to ground or short to voltage on the DVD video signal circuits.

3. Test and repair open, short to ground and short to power on the ground and battery positive

voltage circuits at both rear video displays.

If the video display power and ground circuits test normal, replace the suspected rear
video display.

IMPORTANT: If rear video display does not turn ON, use diagnostic Video

Entertainment System Inoperative.

2008 Chevrolet Silverado 1500

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

Silverado, Sierra & Silverado

Without Third Row Video Screen

1. Flip open the rear video display. With the ignition ON, operate the rear entertainment

system using several known good DVD disks. Observe the rear video screen.

If the screen turns on but is blank. Test for an open, short to ground and short to power
on the DVD video signal circuits to the rear video display. If the DVD video signal
circuits test normal, replace the video display.

If the video screen is still malfunctioning, replace the radio.

Repair Procedures

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Video Display Replacement (Second Row)

Control Module References for radio replacement, setup, and programming

VIDEO ENTERTAINMENT SYSTEM 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

IMPORTANT: If rear video display does not turn ON, use diagnostic Video

Entertainment System Inoperative.

2008 Chevrolet Silverado 1500

2008 ACCESSORIES & EQUIPMENT Cellular, Entertainment, and Navigation - 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. Disconnect the second row video (and third row if equipped) display harness connector.

With the ignition ON, operate the rear entertainment system. Verify there is voltage on the
remote enable signal circuit.

If voltage is not present on the remote enable signal circuit, test and repair open or
short to ground.

If the enable signal circuit tests normal but there is no voltage, replace the radio.

2. Test and repair open, short to ground and short to power on the ground and battery positive

voltage circuits at the second row video (and third row if equipped) display.

If the video display power and ground circuits test normal, replace the suspected rear
video display.

Repair Procedures

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Video Display Replacement (Second Row)

VIDEO ENTERTAINMENT SYSTEM REMOTE CONTROL 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

IMPORTANT: If rear video display turns ON but the video is blank, use

diagnostic Video Display is Poor or Blank.

2008 Chevrolet Silverado 1500

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

Silverado, Sierra & Silverado