B0433

CIRCUIT DESCRIPTION
The Body Control Module (BCM) monitors the voltage level on the control circuit of the RR DEFOG relay. The voltage level should be near system voltage while the RR DEFOG relay is de-energized. The voltage will be pulled low when the BCM energizes the RR DEFOG relay. The BCM test the control circuit of the RR DEFOG relay while the relay is de-energized.

CONDITIONS FOR RUNNING THE DTC
The ignition is ON.

CONDITIONS FOR SETTING THE DTC
The BCM detects a low voltage level on the control circuit of the RR DEFOG relay for 2 seconds.

ACTION TAKEN WHEN THE DTC SETS
The rear window defogger will be disabled until the condition is no longer present.

CONDITIONS FOR CLEARING THE DTC
^ This DTC requires an ignition cycle in order to change from current to history.
^ The BCM no longer detects a low voltage level on the control circuit of the RR DEFOG relay.
^ A history DTC will clear after 50 consecutive ignition cycles if the condition for the malfunction is no longer present.

TEST DESCRIPTION

Steps 1-5:

Steps 6-13:

The number(s) below refer to the step number(s) on the diagnostic table.
2. Listen for an audible click when the RR DEFOG relay operates. Command both the ON and OFF states. Repeat the commands as necessary.
3. Tests for voltage at the coil side of the RR DEFOG relay. The HVAC fuse supplies power to the coil side of the RR DEFOG relay.
4. Verifies that the BCM is providing ground to the RR DEFOG relay.
5. Tests if ground is constantly being applied to the RR DEFOG relay.
6. Tests for an open on the control circuit of the AR DEFOG relay.