2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 290

2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 290

DTC B0283

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System

Check - Vehicle) prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an

overview of the diagnostic approach.

* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure

Instructions) provides an overview of each diagnostic category.

DTC Descriptors

DTC B0283 02

- Electric Rear Defrost Circuit Short to Ground

DTC B0283 05

- Electric Rear Defrost Circuit Short to Battery or Open

DTC B0283 06

- Electric Rear Defrost Circuit Short To Ground or Open

Diagnostic Fault Information

Circuit/System Description

The HVAC control module monitors the voltage level on the supply voltage circuit of the REAR DEFOG relay. The voltage level should be low

while the REAR DEFOG relay is de-energized. The voltage will be near system voltage when the HVAC control module energizes the REAR

DEFOG relay.

Conditions for Running the DTC

Battery voltage must be between 9-16 volts.

Conditions for Setting the DTC

B0283 02

The HVAC control module detects a short to ground in the rear defog relay control circuit for greater than 1 second.

B0283 05

The HVAC control module detects a short to voltage or an open/high resistance in the rear defog relay control circuit or the rear defog relay ground

circuit for greater than 1 second.

B0283 06

The HVAC control module detects a short to ground or open/high resistance in the rear defog relay control circuit for 1 second or greater.

Action Taken When the DTC Sets

The rear window defogger will be inoperative

Conditions for Clearing the DTC