Test Description

WARNING: This page is about a different car, the 2003 Buick Regal and 2003 Buick Century. However, it is still accessible from the selected car via links, so may be relevant.

The numbers below refer to the step numbers 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.
3. Verifies that the BCM is providing ground to the backup lamp relay. Indicating a short to voltage internal to the backup lamp relay.
4. Tests for a short to voltage at control circuit of the backup lamp relay.

Fig 1: DTC B2553

Courtesy of GENERAL MOTORS CORP.