Chevrolet Silverado / GMC Sierra. Manual — part 2959

DIAGNOSTIC STARTING POINT - FIXED AND MOVEABLE WINDOWS

Begin the system diagnosis with the Diagnostic System Check - Vehicle . The Diagnostic
System Check will provide the following information:

The identification of the control modules which command the system.

The ability of the control modules to communicate through the serial data circuit.

The identification of any stored diagnostic trouble codes (DTCs) and their status.

The use of the Diagnostic System Check will identify the correct procedure for diagnosing the
system and where the procedure is located.

DTC B0283

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.

DTC Descriptors

DTC B0283 06

Electric Rear Defrost Circuit Short To Ground or Open

Diagnostic Fault Information

Circuit/System Description

Circuit

Short to

Ground

Open/High

Resistance

Short to

Voltage

Signal

Performance

Relay Switch B+

2

2

-

-

Rear Defog Relay Control

B0283 06

B0283 06

2

-

Rear Defog Relay Ground

-

B0283 06

2

-

Rear Defogger Control

2

2

1

-

Rear Window Defogger Grid
Ground

-

2

2

-

1. Rear Defogger Always On
2. Rear Defogger Inoperative

2008 Chevrolet Silverado 1500

2008 ACCESSORIES & EQUIPMENT Fixed and Moveable Windows - Cab & Chassis Sierra, Cab & Chassis Silverado,

Sierra & Silverado