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Home › Chevrolet › 2002 › Impala LS › Repair and Diagnosis › Transmission › Automatic Trans › Shift Interlock Systems › Diagnostic Tests › DTC B2712 › Diagnostic Procedure

Diagnostic Procedure

  1. Did you perform the diagnostic system check? If so, go to next step. If not, see DIAGNOSTIC SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM.
  2. Install a scan tool. Turn ignition switch to RUN position. With a scan tool, command the BRAKE TO SHIFT output ON and OFF. Does the A/T shift lock solenoid turn ON and OFF with each command? If so, check for intermittent condition. See SYMPTOM DIAGNOSIS  under TROUBLE SHOOTING. If not, go to next step.
  3. Turn ignition switch to the OFF position. Disconnect the shift lock solenoid. Turn the ignition switch to the ON position. Connect a test light between ground and the shift lock solenoid supply voltage circuit (Dark Green/White wire) at the solenoid. Does the test light illuminate? If so, go to next step. If not, go to step  8 .
  4. Connect a test light between the shift lock solenoid control circuit (Tan/White wire) at the shift lock solenoid and the shift lock solenoid voltage supply circuit (Dark Green/White wire) at the shift lock solenoid. With a scan tool, command the shift lock solenoid ON and OFF. Does the test light turn ON and OFF with each command? If so, go to step  11 . If not, go to next step.
  5. Does the test light remain illuminated with each command? If so, go to step 7 . If not, go to next step.
  6. Test the shift lock solenoid control circuit (Tan/White wire) for an open. Did you find and correct the condition? If so, go to step  17 . If not, go to step  12 .
  7. Test the shift lock solenoid control circuit (Tan/White wire) for a short to ground. Did you find and correct the condition? If so, go to step  17 . If not, go to step  12 .
  8. Turn ignition switch to the OFF position. Connect a test light between ground and the ignition feed circuit (Pink wire) at the stoplamp switch. Turn the ignition switch to the ON position. Does the test light illuminate? If so, go to next step. If not, go to step  13 .
  9. Test the shift lock solenoid voltage supply circuit (Dark/Green White wire) for an open or short to ground. Did you find and correct the condition? If so, go to step  17 . If not, go to next step.
  10. Inspect for proper stoplamp switch adjustment. See STOPLAMP SWITCH  under ADJUSTMENTS. Inspect for poor connections at the stoplamp switch. Did you find and correct the condition? If so, go to step  17 . If not, go to step  14 .
  11. Inspect for poor connections at the shift lock solenoid. Did you find and correct the condition? If so, go to step  17 . If not, go to step  15 .
  12. Inspect for poor connections at the harness connector of the BCM. Did you find and correct the condition? If so, go to step  17 . If not, go to step  16 .
  13. Repair the ignition feed circuit (Pink wire) to the stoplamp switch. After repairs, go to step  17 .
  14. Replace the stoplamp switch. See STOPLAMP SWITCH  under REMOVAL & INSTALLATION. After repairs, go to step  17 .
  15. Replace the shift lock solenoid. See SHIFT LOCK SOLENOID  under REMOVAL & INSTALLATION. After repairs, go to step  17 .
    16. NOTE: Perform the set up procedure for the BCM.
  16. Replace the BCM. See appropriate BODY CONTROL MODULES article in ACCESSORIES & EQUIPMENT. After repairs, go to step  17 .
  17. Use the scan tool in order to clear the DTCs. Road test the vehicle within the CONDITIONS FOR SETTING DTC  . Does the DTC reset? If so, go to step  2 . If not, system is okay.
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