Test Description

WARNING: This page is about a different car, the 2002 Buick Regal and 2002 Buick Century. However, it is still accessible from the selected car via links, so may be relevant.

The number(s) below refer to the step number(s) on the diagnostic table.

2. Listen for an audible click when the A/C compressor clutch relay operates. Command both the ON and OFF states. Repeat the commands as necessary.
3. Tests for voltage at the coil side of the A/C compressor clutch relay.
4. Verifies that the PCM is providing ground to the A/C compressor clutch relay.
5. Tests if ground is constantly being applied to the A/C compressor clutch relay.
6. Tests for a short to voltage or an open.
12. Perform the recalibration procedure for the PCM.

Fig 1: DTC P1546 (LG8) Testing Procedures (1 of 2)

Courtesy of GENERAL MOTORS CORP.

Fig 2: DTC P1546 (LG8) Testing Procedures (2 of 2)

Courtesy of GENERAL MOTORS CORP.