GM Service Manual Online
For 1990-2009 cars only

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

   •  Door Lock/Indicator Schematics
   •  Component Connector End Views
   •  Power Door Locks Description and Operation

Visual/Physical Inspection

    • Inspect for aftermarket devices which could affect the operation of the power mirrors and the power windows systems. Refer to Checking Aftermarket Accessories .
    • Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom.
    • Inspect all related ground points for being clean and tight.

Intermittent

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

Symptom List

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

    •  Power Door Locks Inoperative
    •  Power Door Lock Key Cylinder Switches Inoperative
    •  Power Door Locks Inoperative - One Door or Switch