Retrieving Codes

Perform diagnostic circuit check before diagnosing vehicle using self-diagnostic system. See appropriate DIAGNOSTIC CIRCUIT CHECK chart under DIAGNOSTIC CODE CHARTS.
Ensure ignition switch is off. Using a jumper wire, jumper ALDL White connector terminals No. 1 and 3. See Fig 1 . Connector is located behind right kick panel. Turn ignition on and observe CHECK ENGINE light. Read fault codes. Proceed to appropriate charts under DIAGNOSTIC CODE CHARTS to diagnose fault codes.
WARNING: Ensure jumper wire is connected to ALDL White connector. A connector for Supplemental Inflatable Restraint (SIR) system and Automatic Transaxle Control Unit is located next to ALDL connector.
If no fault codes are stored, CHECK ENGINE light will flash on and off rapidly until jumper wire is disconnected. Count the number of flashes and look for pauses in flashing to ensure no fault codes are overlooked. If fault codes are stored, code will flash 3 times starting with the lowest code.

Fig 1: ALDL Connector Terminal ID (Storm & Storm GSi)

Courtesy of GENERAL MOTORS CORP.