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 automatic autolamp relay operates. Command both the ON and OFF states. Repeat the commands as necessary.
4. Tests for voltage at the coil side feed of the automatic autolamp relay. The LP Park fuse supplies power to the coil side feed of the automatic autolamp relay.
5. Verifies that the BCM is providing ground to the automatic autolamp relay.
6. Tests if ground is constantly being applied to the automatic autolamp relay.

Fig 1: DTC B2577 (Steps 1 - 4)

Courtesy of GENERAL MOTORS CORP.

Fig 2: DTC B2577 (Steps 5 - 15)

Courtesy of GENERAL MOTORS CORP.