B2552
CIRCUIT DESCRIPTIONThe Body Control Module (BCM) controls the Backup Lamp relay. The BCM grounds the backup lamp relay control circuit which energizes the backup lamp relay.
CONDITIONS FOR RUNNING THE DTC
Any of the following conditions may be present.
^ The transaxle is not in the reverse position.
^ The emergency vehicle interior lamp switch is enabled.
^ The ignition switch is in the off position.
CONDITIONS FOR SETTING THE DTC
^ The fault code will set when the backup lamp relay control circuit is inactive and a short to ground or open is present.
^ The condition above must be present for more than 0.3 seconds.
ACTION TAKEN WHEN THE DTC SETS
The BCM stores DTC B2552 in memory.
CONDITIONS FOR CLEARING THE DTC
^ A current DTC B2552 will clear if the BCM no longer detects a short to ground or open in the backup lamp relay control circuit.
^ A history DTC B2552 will clear after 100 consecutive ignition cycles if the condition for the malfunction is no longer present.
^ The BCM receives a clear code command from the scan tool.
DIAGNOSTIC AIDS
^ If the DTC B2552 is a history DTC, the fault may be intermittent. Refer to Testing for Intermittent and Poor Connections in Diagrams.
^ The following conditions may cause an intermittent malfunction to occur:
- An intermittent short to ground or open in the backup lamp control circuit.
- The backup lamp relay coil is intermittently shorted to ground or open.
- The BCM is intermittently shorted to ground or open.
TEST DESCRIPTION
Steps 1-4:
Steps 5-15:
The number(s) below refer to the step number(s) on the diagnostic table.
2. Listen for an audible click when the backup lamp relay operates. Command both the ON and OFF states. Repeat the commands as necessary.
4. Tests for voltage at the coil side of the backup lamp relay. The R/CMPT fuse supplies power to the coil side and the switched side of the backup lamp relay.
5. Verifies that the BCM is providing ground to the backup lamp relay.
6. Tests if ground is constantly being applied to the backup lamp relay.