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Test B: Shift Lever Can Be Moved Without Brake Pedal Depressed

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2002 GMC Yukon XL, 2002 GMC Yukon, 2002 GMC Sierra, 2002 GMC Cab & Chassis Sierra, and 2002 Chevrolet Tahoe. 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 SYMPTOM DIAGNOSIS and all the necessary inspections? If so, go to next step. If not, see SYMPTOM DIAGNOSIS  under TROUBLE SHOOTING.
  2. Turn ignition switch to the ON position. Apply the parking brake and block the wheels. Attempt to move the shift lever out of the Park position without pressing the brake pedal. Does the shift lever move out of the Park position? If so, go to next step. If not, see SYMPTOM DIAGNOSIS  under TROUBLE SHOOTING.
  3. Turn ignition switch to the OFF position. Ensure gearshift lever is in the Park position. Connect a test light between ground and the voltage supply circuit at the BTSI fuse (10-amp). Turn the ignition switch to the ON position. Does the test light illuminate? If so, go to next step. If not, go to step  8 .
  4. Connect a test light between ground and the stoplamp switch voltage supply circuit (Light Green/Black wire) at stoplamp switch. Does the test light illuminate? If so, go to next step. If not, go to step  14 .
  5. Connect a test light between ground and the stoplamp switch control circuit (Dark Green/White wire) at stoplamp switch. 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  11 .
  6. Connect a test light between ground and the shift lock solenoid voltage supply circuit (Dark Green/White wire) at the shift lock solenoid. Does the test light illuminate? If so, go to next step. If not, go to step  15 .
  7. Test the shift lock solenoid ground circuit (Black wire) for an open or high resistance. Did you find and correct the condition? If so, go to step  20 . If not go to step  12 .
  8. Turn ignition switch to the OFF position. Disconnect the PNP switch connector. Connect a test light between ground and the PNP switch ignition feed circuit (Pink wire) at the PNP 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. Turn ignition switch to the OFF position. Connect a 10-amp fused jumper between the ignition feed circuit (Pink wire) and the park signal circuit (Light Green wire) at the PNP switch. Connect a test light between ground and the stoplamp switch voltage supply circuit at the BTSI fuse (10-amp). Turn the ignition switch to the ON position. Does the test light illuminate? If so, go to next step. If not, go to step  16 .
  10. Inspect for proper PNP switch adjustment. See appropriate AUTOMATIC article in AUTOMATIC TRANSMISSIONS. Inspect the PNP switch for poor connections. Did you find and correct the condition? If so, go to step  20 . If not, go to step  17 .
  11. Inspect the stoplamp switch for poor connections. Did you find and correct the condition? If so, go to step  20 . If not, go to step  18 .
  12. Inspect the shift lock solenoid for poor connections. Did you find and correct the condition? If so, go to step  20 . If not, go to step  19 .
  13. Repair the open or short in the PNP switch ignition feed circuit (Pink wire). After repairs, go to step  20 .
  14. Repair the stoplamp switch voltage supply circuit (Light Green/Black wire) for an open or short. After repairs, go to step  20 .
  15. Repair the open in the shift lock solenoid voltage supply circuit (Dark Green/White wire). After repairs, go to step  20 .
  16. Repair the open or short in the PNP switch park signal circuit (Light Green wire). After repairs, go to step  20 .
  17. Replace the PNP switch. See appropriate AUTOMATIC article in AUTOMATIC TRANSMISSIONS. After repairs, go to step  20 .
  18. Replace the stoplamp switch. See STOPLAMP SWITCH  under REMOVAL & INSTALLATION. After repairs, go to step  20 .
  19. Replace the shift lock solenoid. See SHIFT LOCK SOLENOID  under REMOVAL & INSTALLATION. After repairs, go to next step.
  20. 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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