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Test C: Steering Column Lock Malfunction

WARNING: This page is about a different car, the 2000 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Use this test procedure when STEERING COLUMN LOCK message is displayed or steering column does not lock or unlock.
NOTE: Perform BCM diagnostic system check prior to performing test procedures and after completing any repairs. See BODY CONTROL MODULE DIAGNOSTIC SYSTEM CHECK under SELF-DIAGNOSTIC SYSTEM in BODY CONTROL MODULES - CORVETTE article.
  1. Using scan tool, retrieve BCM DTCs. If steering column DTCs B2587, B2588, B2592 or B2593 are stored, perform BCM diagnostic system check. See BODY CONTROL MODULE DIAGNOSTIC SYSTEM CHECK under SELF-DIAGNOSTIC SYSTEM in BODY CONTROL MODULES - CORVETTE article. If steering column DTCs are not stored, go to next step.
  2. If steering column connector C207 was disconnected with ignition on, go to step  15 . See WIRING DIAGRAMS  . If connector C207 was not disconnected, go to next step.
  3. Turn ignition on. Using scan tool, check BCM steering column lock state. If display is ENABLE STDBY, go to step  6 . If display is not ENABLE STDBY, go to next step.
  4. Turn ignition off. Using scan tool, check BCM KEY IN IGNITION status with key in ignition. Display should read ACTIVE. Check BCM KEY IN IGNITION status with key out of ignition. Display should read INACTIVE. If display is as specified, go to next step. If display is not as specified, diagnose and repair key in ignition circuits between ignition switch and BCM. See WIRING DIAGRAMS  .
  5. Disconnect steering column connector C207. Connector C207 is a 4-pin connector located on left side of steering column, attached to lower instrument panel bar. Using scan tool, check BCM KEY OUT OF IGNITION status with key in ignition. Display should read ACTIVE. Check BCM KEY OUT OF IGNITION status with key out of ignition. Display should read INACTIVE. If display is as specified, go to step  7 . If display is not as specified, go to step  10 .
  6. Using test light connected to battery voltage, probe harness connector C207 terminal "A". See Fig 1 . If test light illuminates, go to next step. If test light does not illuminate, go to step  9 .
  7. Remove key from ignition switch. Connect test light between harness connector C207 terminals "C" and "D". Using scan tool, cycle steering column lock/unlock motor. If test light illuminates in both lock and unlock positions, go to step  12 . If test light did not illuminate in both positions, go to step  11 .
  8. Check for open or short to ground in Light Green wire between steering wheel lock connector C207, terminal "B" and BCM connector C2, terminal C15. If an open or short was found, repair as necessary and go to step  15 . If no problem was found, go to step  12 .
  9. Repair open circuit in Black wire between steering wheel lock connector C207, terminal "A" and ground. After repairs, go to step  15 .
  10. Check for open in Tan wire between BCM connector C3, terminal B8 and ignition switch connector C2, terminal "D". If an open was found, repair as necessary and go to step  15 . If no problem was found, go to step  13 .
  11. Check for an open or short to ground in Orange wire between steering wheel lock connector C207, terminal "D" and BCM connector C3, terminal A8. Check for an open or short to ground in Purple wire between steering wheel lock connector C207, terminal "C" and BCM connector C3, terminal A6. If an open or short was found, repair as necessary and go to step  15 . If no problem was found, go to step  14 .
  12. Replace steering column lock motor. See STEERING WHEEL COLUMN LOCK  under REMOVAL & INSTALLATION. After repairs, go to step  15 .
  13. Replace ignition lock cylinder. See REMOVAL & INSTALLATION in ANALOG INSTRUMENT PANELS - CORVETTE. After repairs, go to step  15 .
  14. Replace BCM. See BODY CONTROL MODULE  under REMOVAL & INSTALLATION. After repairs, go to step  15 .
  15. Turn ignition off. Disconnect BCM fuse No. 25 for 15 seconds to clear BCM steering column fail enable mode. Reinstall fuse and reconnect components and connectors. Turn ignition on. Clear DTCs. Perform BCM diagnostic system check. See BODY CONTROL MODULE DIAGNOSTIC SYSTEM CHECK under SELF-DIAGNOSTIC SYSTEM in BODY CONTROL MODULES - CORVETTE article.
Fig 1: Identifying C207 Harness Connector Terminals
G99A08572Courtesy of GENERAL MOTORS CORP.
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