Rear Def Relay Shorted Hi

When Monitored: With the ignition key in the run position.

Set Condition: The BCM attempts to activate the rear defogger relay and senses excessive current on the circuit.

Possible Causes are:

Turn ignition off. Lower the Junction Block and remove the Rear Window Defogger Relay. Connect a test light between cavities No. 85 & 86 of the Rear Window Defogger Relay connector. Turn ignition on. Using the DRBIII(R), actuate the R Defog Relay and observe the test light. Does the test light flash on and off when the relay is actuated? If yes, replace the rear window defogger relay. Perform MEMORY SYSTEM VERIFICATION TEST under VERIFICATION TESTS. If no, go to next step.
Turn ignition off. Lower the Junction Block and remove the Rear Window Defogger Relay. Disconnect and remove the Body Control Module. Turn ignition on. Measure the voltage at cavities No. 85 & 86 of the Relay connector. Is the voltage more than one volt at BOTH cavities? (Note: there should only be voltage on one cavity) If yes, replace the junction block. Perform MEMORY SYSTEM VERIFICATION TEST under VERIFICATION TESTS. If no, replace the Body Control Module. Perform MEMORY SYSTEM VERIFICATION TEST under VERIFICATION TESTS.