GM Service Manual Online
For 1990-2009 cars only

Symptoms w/ A45

Important: The following steps must be completed before using the symptoms tables.

    • Perform the Diagnostic System Check - Power Seat Systems before using the Symptom Tables in order to verify that all of the following are true:
       - There are no DTCs set.
       - The control module(s) can communicate via the serial data link.
    • Review the circuit description in order to familiarize yourself with the system functions. Refer to:
       -  Memory Seat Description
       -  Memory Seat Circuit Description

Visual/Physical Inspection

    • Inspect for aftermarket devices which could affect the operation of the power seats. Refer to Checking Aftermarket Accessories in Wiring Systems.
    • Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom.

Intermittent

Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.

Symptom List

Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom:

    •  Heated Seat Always On
    •  Heated Seat Inoperative
    •  Heated Seat Switch High Indicator Inoperative
    •  Heated Seat Switch Low Indicator Inoperative
    •  Lumbar Support Does Not Move In or Out
    •  Lumbar Support Does Not Move Up or Down
    •  Lumbar Support Inoperative
    •  Power Seat Does Not Move Forward/Rearward
    •  Power Seat Does Not Recline
    •  Power Seat Does Not Tilt Forward
    •  Power Seat Does Not Tilt Rearward
    •  Power Seat Inoperative
    •  Power Seats - Memory Switch Inoperative

Symptoms w/o A45

Important: Review the system operation in order to familiarize yourself with the system functions. Refer to:

   •  Power Seats Circuit Description
   •  Power Lumbar Circuit Description
   •  Heated Seats Circuit Description

Visual/Physical Inspection

    • Inspect for aftermarket devices which could affect the operation of the power seat. Refer to Checking Aftermarket Accessories in Wiring Systems.
    • Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom.

Intermittent

Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.

Symptom List

Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom:

    •  Heated Seat Always On
    •  Heated Seat Inoperative
    •  Heated Seat Switch High Indicator Inoperative
    •  Heated Seat Switch Low Indicator Inoperative
    •  Power Seat Does Not Move Forward/Rearward
    •  Power Seat Does Not Recline
    •  Power Seat Does Not Tilt Forward
    •  Power Seat Does Not Tilt Rearward
    •  Power Seat Inoperative