Test Description

WARNING: This page is about a different car, the 2002 Chevrolet Malibu. 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 ALC headlamp relay operates. Command both the ON and OFF states. Repeat the commands as necessary.
3. Tests for voltage at the coil side of the ALC headlamp relay. The LH HDLP fuse supplies power to the coil side of the ALC headlamp relay.
4. Verifies that the body control module is providing ground to the ALC headlamp relay.
5. Tests if ground is constantly being applied to the ALC headlamp relay.

Fig 1: DTC B2577 (1 Of 2)

Courtesy of GENERAL MOTORS CORP.

Fig 2: DTC B2577 (2 Of 2)

Courtesy of GENERAL MOTORS CORP.