B0283

DTC B0283

CIRCUIT DESCRIPTION
The body control module (BCM) controls the rear window defogger relay circuit. When the ignition switch is in Run position and the operator has depressed the defogger switch, the BCM provides battery positive voltage to the rear window defogger relay control circuit. The rear window defogger relay coil is grounded to G302. If the rear window defogger relay positive control feed is shorted or if there is an open in the circuit, DTC B0283 will set.

DTC DESCRIPTOR
This diagnostic procedure supports the following DTC:
DTC B0283 Electric Rear Defrost Circuit




This vehicle has DTCs which include DTC Symptoms. For more information on DTC Symptoms, refer to in Vehicle DTC Information.

CONDITIONS FOR RUNNING THE DTC
The system voltage must be between 9-16 volts.

CONDITIONS FOR SETTING THE DTC
- The BCM detects a short to ground in the rear window defogger relay control circuit when the BCM is trying to energize the relay.
- The BCM detects a short to voltage in the rear window defogger relay control circuit when the BCM is trying to energize the relay.
- The BCM detects that the rear window defogger relay control circuit is open.
- The condition above must be present for more than 1 second.

ACTION TAKEN WHEN THE DTC SETS
- The BCM stores DTC B0283 in memory.
- The rear window defogger will not operate.

CONDITIONS FOR CLEARING THE DTC
- A current DTC clears when the malfunction is no longer present.
- A history DTC clears when the module ignition cycle counter reaches the reset threshold, without a repeat of the malfunction.

TEST DESCRIPTION

Step 1 - Step 11:

The numbers below refer to the step numbers on the diagnostic table.
2. This step tests for voltage at the coil side of the rear window defogger relay. The BATT MAIN 3 fuse supplies power to the coil side of the rear window defogger relay.
3. This step tests the control circuit side of the rear window defogger relay for faults that cause both DTC B0283.
4. Listen for an audible click when the rear window defogger relay operates. Command both the ON and OFF states. Repeat the commands as necessary.
5. This step verifies that the BCM is providing ground to the rear window defogger relay.
10. After replacement of the BCM, you must calibrate the new module for proper operation.