B1477

CIRCUIT DESCRIPTION
The BCM interfaces with the vehicle's power distribution system through the RAP#1 relay. The RAP#1 relay allows the BCM to control the application of power to the feed accessory circuits.

When the ignition switch turns from ON/RUN to LOCK or OFF, with all of the vehicle doors closed, the BCM leaves the RAP#1 relay energized for 20 minutes, or until any vehicle door opens and the BCM detects a ground signal in one of the door ajar circuits.

CONDITIONS FOR SETTING THE DTC
- The BCM detects no voltage at the RAP#1 relay control circuit when the BCM has not grounded the circuit.
- The conditions above must be present for more than 300 milliseconds.

ACTION TAKEN WHEN THE DTC SETS
- The BCM stores DTC B1477 in memory.
- The circuits powered by the RAP#1 relay remain powered at all times if the relay control circuit is shorted to ground.
- The circuits powered by the RAP#1 relay will never be powered if the relay control circuit is open.

CONDITIONS FOR CLEARING THE DTC
- The correct voltage is present at the RAP#1 relay control circuit as detected by the BCM.
- A history DTC B1477 will clear after the modules ignition cycle counter reaches the reset threshold, without a repeat of the malfunction.

TEST DESCRIPTION

DTC B1477 - Steps 1-6:

DTC B1477 - Steps 7-13:

The numbers below refer to the step numbers on the diagnostic table.
2. Listen for an audible click when the RAP#1 relay operates. Command both the ON and OFF states. Repeat the commands as necessary.
3. This step tests for voltage at the coil side of the RAP#1 relay. The RAP#1 fuse in the Fuse Block Underhood, supplies power to the coil side of the RAP#1 relay.
4. This step verifies that the Body Control Module (BCM) is providing ground to the RAP#1 relay.
5. This step tests if ground is constantly being applied to the RAP#1 relay.