Test Description

WARNING: This page is about a different car, the 2003 Chevrolet Corvette. 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.

Lack of communication may be due to a partial malfunction of the class 2 serial data circuit or due to a total malfunction of the class 2 serial data circuit. The specified procedure will determine the particular condition.
Determine if any DTCs are present which may be the cause of the condition.
The presence of DTCs which begin with "U" indicate some other module is not communicating. The specified procedure will compile all the available information before tests are performed.
Determine if a BCM internal memory malfunction exists.
Determine if a charging system malfunction exists.

Fig 1: Diagnostic System Check - Power Seat Systems
Courtesy of GENERAL MOTORS CORP.

Fig 2: Scan Tool Output Controls
Courtesy of GENERAL MOTORS CORP.