Diagnostic Aids

If the DTC B2553 is a history DTC, the fault may be intermittent. Refer to TESTING WIRING SYSTEMS FOR INTERMITTENT & POOR CONNECTIONS .
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.