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Retrieving Codes

Ensure ignition switch is in the "OFF" position. Using a jumper wire, ground Assembly Line Diagnostic Link (ALDL) connector diagnostic test terminal to ground terminal. See Fig 1 . Connector is located in the passenger compartment. Turn ignition switch to the "ON" position. Read trouble codes.

Fig 1: Spectrum ALDL Connector
G121598Courtesy of GENERAL MOTORS CORP.