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BTSI Control Inoperative

NOTE: Ensure Park/Neutral Position (PNP) switch is adjusted properly. See appropriate AUTOMATIC TRANSMISSION SERVICING article in TRANSMISSION SERVICING. PNP switch my also be referred to as Transaxle Range (TR) switch. Verify system operation after performing any repairs. See SYSTEM OPERATION CHECK  under TROUBLE SHOOTING.
  1. Turn ignition on. Depress brake pedal. If gearshift lever can be moved from Park, check for intermittent problem. If gearshift lever cannot be moved from Park, go to next step.
  2. Disconnect shift lock relay located at right side of engine compartment, in front of battery. Depress brake pedal. Using test light connected to ground, probe shift lock relay battery feed circuit (Green/White wire) at shift lock relay cavity. If test light illuminates, go to step  8 . If test light does not illuminate, go to next step.
  3. Using test light connected to ground, backprobe Green/White wire at brakelight switch harness connector. Depress brake pedal. If test light illuminates, go to next step. If test light does not illuminate, go to step  5 .
  4. Repair open in Green/White wire between brakelight switch and shift lock relay. After repairs, go to step  23 .
  5. Using test light connected to ground, backprobe brakelight switch battery feed circuit (Green wire) at brakelight switch harness connector. If test light illuminates, go to step  7 . If test light does not illuminate, go to next step.
  6. Repair open in Green wire between brakelight switch and STOP fuse (15-amp) located in junction block. After repairs, go to step  23 .
  7. Adjust or replace brakelight switch. After repairs, go to step  23 .
  8. Using test light connected to battery voltage, probe shift lock relay ground circuit (Black wire) at shift lock relay cavity. If test light illuminates, go to step  10 . If test light does not illuminate, go to next step.
  9. Repair open in Black wire between shift lock relay and chassis ground. After repairs, go to step  23 .
  10. Using test light connected to ground, probe shift lock relay ignition feed circuit (Orange/Green wire) at shift lock relay cavity. If test light illuminates, go to step  16 . If test light does not illuminate, go to next step.
  11. Using test light connected to ground, backprobe Orange/Green wire at Transmission Range (TR) switch harness connector. If test light illuminates, go to next step. If test light does not illuminate, go to step  13 .
  12. Repair open in Orange/Green wire between TR switch and shift lock relay. After repairs, go to step  23 .
  13. Using test light connected to ground, backprobe TR switch ignition feed circuit (Yellow wire) at TR switch harness connector. If test light illuminates, go to step  15 . If test light does not illuminate, go to next step.
  14. Repair open in Yellow wire between TR switch and TURN fuse (10-amp) located in junction block. After repairs, go to step  23 .
  15. Replace TR switch. After repairs, go to step  23 .
  16. Reconnect shift lock relay. Using test light connected to ground, backprobe BTSI solenoid control circuit (Blue/Green wire) at shift lock relay cavity. Depress brake pedal. If test light illuminates, go to step  18 . If test light does not illuminate, go to next step.
  17. Replace shift lock relay. After repairs, go to step  23 .
  18. Disconnect shift lock relay and BTSI solenoid harness connectors. Check for continuity in BTSI solenoid control circuit (Blue/Green wire) between BTSI solenoid and shift control relay. If continuity is present, go to step  20 . If continuity is not present, go to next step.
  19. Repair open in Blue/Green wire between BTSI solenoid and shift lock relay. After repairs, go to step  23 .
  20. Using test light connected to battery voltage, probe shift lock relay ground circuit (Black wire) at shift lock relay harness connector. If test light illuminates, go to step  22 . If test light does not illuminate, go to next step.
  21. Repair open in Black wire between BTSI solenoid and chassis ground. After repairs, go to step  23 .
  22. Replace BTSI solenoid. After repairs, go to next step.
  23. Check system operation and verify repairs. See SYSTEM OPERATION CHECK  under TROUBLE SHOOTING. If system operates properly, system is okay. If system does not operate properly, repeat step  2 .
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