B2553

DTC B2553

Circuit Description

The body control module (BCM) controls the backup lamp relay. The BCM grounds the backup lamps relay control circuit energizing the backup lamp relay. The BCM connects directly to the center console fuse block with no external wiring between them.

DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC B2553 Backup Lamps Control Circuit High

Conditions for Running the DTC

* The transaxle must be in the REVERSE position.
* The ignition switch must not be in the OFF position.

Conditions for Setting the DTC

* The BCM detects a short to voltage in the backup lamp relay control circuit when the BCM tries to energize the backup lamp relay.
* The condition above must be present for more than 0.3 seconds.

Action Taken When the DTC Sets

The backup lamps will not illuminate.

Conditions for Clearing the DTC

* A current DTC will clear when the BCM no longer detects a short to battery in the backup lamp relay control circuit.
* A history DTC will clear after 100 consecutive ignition cycles if the condition for the malfunction is no longer present.
* Current and history DTCs can be cleared when the BCM receives a clear code command from a scan tool.

Diagnostic Aids

* If the DTC is a history DTC, the fault may be intermittent. Refer to Testing for Intermittent Conditions and Poor Connections. Component Tests and General Diagnostics
* The following conditions may cause an intermittent malfunction to occur:

- An intermittent short to battery in backup lamp relay control circuit.
- The backup lamp relay coil is intermittently shorted to the battery.
- The BCM is intermittently shorted to the battery.

Test Description

Step 1 - Step 8:

The numbers below refer to the step numbers on the diagnostic table.
3. Verifies that the BCM or backup lamp relay is at fault.