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Retrieving Codes

NOTE: Perform appropriate FUNCTIONAL TEST chart under TROUBLE SHOOTING CHARTS. See Figure or Figure .
  1. If using Tech 1 for retrieving codes, go to step 3). If using ANTILOCK light for retrieving codes, turn ignition on. Using a jumper wire, connect terminal "H" to terminal "A" in Data Link Connector (DLC). See Fig 1 . System will repeat trouble code(s) as long as DLC terminals are connected.
    NOTE: The DLC may also be referred to as the Assembly Line Data Link (ALDL) connector. These 2 terms may be used interchangeably.
  2. Trouble codes will be displayed by a flashing ANTILOCK warning light. As an example, Code 25 would be displayed by ANTILOCK warning light flashing 2 times, followed by a pause, then flashing 5 more times. See appropriate DIAGNOSTIC CHART for diagnosis. If no fault codes are present, see appropriate TROUBLE SHOOTING CHART.
  3. Turn ignition off. Connect Tech 1 to DLC. Access 4WAL brake trouble codes using Tech 1. Repair trouble codes in order they appear. See appropriate DIAGNOSTIC CHART for diagnosis. If no fault codes are present, see appropriate TROUBLE SHOOTING CHART.
Fig 1: Identifying DLC Terminals
G90H06369Courtesy of GENERAL MOTORS CORP.
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