B0286
DTC B0286
CIRCUIT DESCRIPTION
The body control module (BCM) monitors the rear defogger switch input. When the rear defogger is turned ON, rear defog switch closed, the BCM grounds the coil side of the rear defog relay. This will energize the relay activating the rear defogger.
The first time that the rear defogger is activated in an ignition cycle, the rear defogger will remain ON for 15 minutes, or until the ignition switch is turned OFF. If the rear defogger is activated again during the same ignition cycle, the rear defogger will remain ON for 7 1/2 minutes, or until the ignition switch is turned OFF.
DTC DESCRIPTOR
This diagnostic procedure supports the following DTC:
DTC B0286 Electronic Rear Defrost Circuit High
CONDITIONS FOR RUNNING THE DTC
The ignition is in RUN.
CONDITIONS FOR SETTING THE DTC
- The rear defogger relay control circuit is shorted to battery voltage.
- The BCM is commanding the rear defog system to the ON state.
ACTIONS TAKEN WHEN THE DTC SETS
The rear defog will not operate
CONDITIONS FOR CLEARING THE DTC
- This DTC will change from current to history when the fault is no longer present.
- A history DTC will clear after 100 consecutive ignition cycles if the condition for the malfunction is no longer present.
TEST
