B0283

DTC B0283

CIRCUIT DESCRIPTION
The 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 negative voltage to the Rear Window Defogger relay control circuit and the Electronic Compass module. The Electronic Compass module translates the signal to Compass Data which is then transmitted to the DIC for display of the Rear Defogger mode.

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 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

Steps 1 - 5:

Steps 6 - 11:

The numbers below refer to the step numbers on the diagnostic table.
2. 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. Tests the control circuit side of the Rear Window Defogger relay for faults that cause both B0283 DTC.
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. 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.