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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 99 (Shift Interlock Systems) >> Symptom Tests >> Test C: Gearshift Lever Can Be Moved Without Brake Pedal Depressed

Test C: Gearshift Lever Can Be Moved Without Brake Pedal Depressed

WARNING: This page is about a different car, the 2002 Oldsmobile Bravada, 2002 GMC Envoy XL, 2002 GMC Envoy, and 2002 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: For circuit reference, see CONNECTOR IDENTIFICATION  and WIRING DIAGRAMS  .
  1. Did you review the DESCRIPTION and OPERATION and perform the necessary inspections? If so, go to next step. If not, see DESCRIPTION & OPERATION  .
  2. Apply the parking brake and block the wheels. Turn the ignition switch to the ON position. Attempt to move the gearshift lever out of the Park position. Does the gearshift lever move out of the Park position? If so, go to next step. If not, condition is intermittent. See SYMPTOM DIAGNOSIS  .
  3. Turn the ignition switch to the OFF position. Press and hold the brake pedal. Attempt to move the gearshift lever out of the Park position. Does the gearshift lever move out of the Park position? If so, go to next step. If not, go to step  5 .
  4. Test the park lock solenoid ignition feed circuit (Light Green/Black wire) for a short to battery voltage. Did you find and correct the condition? If so, go to step  14 . If not, go to step  8 .
  5. Connect a test light between ground and the stoplamp switch voltage supply circuit (Light Green/Black wire). Turn the ignition switch to the ON position. Does the test light illuminate? If so, go to next step. If not, go to step  11 .
  6. Turn the ignition switch to the OFF position. Connect a test light between ground and the stoplamp switch voltage supply circuit (Light Green/Black wire). Turn the ignition switch to the ON position. Press and release the brake pedal several times. Does the test light turn ON and OFF with the brake pedal? If so, go to next step. If not, go to step  9 .
  7. Turn the ignition switch to the OFF position. Connect a test light between ground and the shift lock solenoid voltage supply circuit (Dark Green/White wire). Turn the ignition switch to the ON position. Press and release the brake pedal several times. Does the test light turn ON and OFF with the brake pedal? If so, go to next step. If not, go to step  10 .
  8. Inspect the park lock/shift lock solenoid assembly for poor connections. Did you find and correct the condition? If so, go to step  14 . If not, go to step  13 .
  9. Inspect the stoplamp switch for poor connections. Did you find and correct the condition? If so, go to step  14 . If not, go to step  12 .
  10. Repair the open in the shift lock solenoid voltage supply circuit (Dark Green/White wire). After repairs, go to step  14 .
  11. Repair the open in the stoplamp switch ignition feed circuit (Light Green/Black wire). After repairs, go to step  14 .
  12. Replace the stoplamp switch. See STOPLAMP SWITCH  under REMOVAL & INSTALLATION. After repairs, go to step  14 .
  13. Replace the shift lock solenoid. See FLOOR SHIFT CONTROL ASSEMBLY  under REMOVAL & INSTALLATION.
  14. Operate the system in order to verify the repair. Did you find and correct the condition? If so, system is okay. If not, go to step  2 .
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