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Automatic Transmission Shift Lock Control Diagnostic System Check

  1. Ensure battery condition, cold cranking amperage and reserve capacity meet specifications. Replace as necessary. Install scan tool to Data Link Connector (DLC). If scan tool powers up, go to next step. If scan tool does not power up, go to TEST B: SCAN TOOL DOES NOT POWER UP  under SYSTEM TESTS.
  2. Turn ignition on, with engine off. Try to establish scan tool communication with Body Control Module (BCM). If communication with BCM is established, go to next step. If communication with BCM is not established, go to TEST A: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE  under SYSTEM TESTS.
  3. Select BCM DISPLAY DTCs function on scan tool. If scan tool displays any DTCs, go to next step. If scan tool does not display any DTCs, repair shift lock control system as necessary. See appropriate SHIFT INTERLOCK SYSTEMS article in AUTOMATIC TRANSMISSIONS.
  4. If scan tool displays any DTCs that begin with a "U", perform specified repair procedure. See DIAGNOSTIC TROUBLE CODE DEFINITIONS  . If scan tool does not display any DTCs that begin with a "U", go to next step.
  5. If scan tool displays DTCs B1982 or B1983 go to DIAGNOSTIC TROUBLE CODE DEFINITIONS  . If scan tool does not display any DTCs, repair shift lock control system as necessary. See appropriate SHIFT INTERLOCK SYSTEMS - PASSENGER CARS article in AUTOMATIC TRANSMISSIONS.
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