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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. Verify system operation after performing any repairs. See SYSTEM OPERATION CHECK  under TROUBLE SHOOTING.
  1. Connect test light between ground and PNP switch power feed circuit at PNP switch. Turn ignition on, engine off. If test light illuminates, go to next step. If test light does not illuminate, go to step  7.
  2. Ensure gearshift lever is in "P" position. Connect test light between ground and PNP switch signal circuit at PNP switch. If test light illuminates, go to next step. If test light does not illuminate, go to step  11.
  3. Connect test light between ground and PNP switch signal circuit at brakelight switch. If test light illuminates, go to next step. If test light does not illuminate, go to step  8.
  4. Connect test light between ground and brakelight switch signal circuit at brakelight switch. Depress and release brake pedal several times. If test light turns on and off with brake pedal movement, go to next step. If test light does not turn on and off with brake pedal movement, go to step  12.
  5. Connect test light between ground and brakelight switch signal circuit at BTSI solenoid. Depress brake pedal. If test light illuminates, go to next step. If test light does not illuminate, go to step  9.
  6. Connect test light between battery positive terminal and BTSI solenoid ground circuit at BTSI solenoid. If test light illuminates, go to step  13. If test light does not illuminate, go to step  10.
  7. Repair open in PNP switch power feed circuit.
  8. Repair open in PNP switch signal circuit.
  9. Repair open in brakelight switch signal circuit.
  10. Repair open in BTSI solenoid ground circuit.
  11. Inspect for proper PNP switch adjustment. Inspect for poor connections at PNP switch. Repair as necessary. If condition was not corrected, replace PNP switch.
  12. Inspect for poor connections at brakelight switch. Repair as necessary. If condition was not corrected, replace brakelight switch.
  13. Inspect for poor connections at BTSI solenoid. Repair as necessary. If condition was not corrected, replace BTSI solenoid.
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