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
