Test Description

The numbers below refer to the step numbers on the diagnostic table. See Fig 1.

1. 2
   
   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.
2. 4
   
   DTCs that may be stored in the Seat Adjuster Memory Module will be retrieved. These DTCs must be addressed prior to proceeding to the symptoms list.
3. 5
   
   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.
   Fig 1: Diagnostic System Check - Power Seat Systems - Diagnostic Table

   Courtesy of GENERAL MOTORS CORP.

Fig 2: Scan Tool Data List

Courtesy of GENERAL MOTORS CORP.