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:

   •  Automatic Transmission Shift Lock Control Circuit Description
   •  Automatic Transmission Shift Lock Control Description

Visual/Physical Inspection

    • Inspect for aftermarket devices which could affect the operation of the system. 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.
    • 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 in Wiring Systems.

Symptom List

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

    •  Automatic Transmission Shift Lock Control Inoperative
    •  Automatic Transmission Shift Lock Control Always On with Ignition in Run
    •  OD/OFF Indicator Does not Light
    •  OD/OFF Indicator Remains Lit
    •  Power Indicator Lamp Does not Light
    •  Power Indicator Remains Lit