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Shift Interlock System: Other Chevrolet Venture I

Automatic Trans 3 illustrations ~1419 words

BRAKE TRANSMISSION INTERLOCK SOLENOID

Note. Brake Transmission Shift Interlock (BTSI) solenoid may also be known as shift interlock actuator.

Gearshift lever cannot be moved from Park without depressing brake pedal if ignition is on. When pressure is applied to brake pedal, BTSI solenoid is de-energized to release gearshift lever from Park. Brakelight switch interrupts circuit to mechanically unlock gearshift lever by de-energizing BTSI solenoid. See WIRING DIAGRAMS .

PARK LOCK CABLE

Gearshift lever is locked in Park when ignition switch is in LOCK position. With ignition on, gearshift lever is allowed movement to desired position. Ignition key cannot be removed until gearshift lever is returned to Park. Park lock cable is located on steering column. (Scheme 88)

Scheme 88

Scheme 88: PARK LOCK CABLE
Scheme 88: PARK LOCK CABLE

BTSI CONTROL INOPERATIVE

Note. Ensure Park/Neutral Position (PNP) switch is adjusted properly. See appropriate AUTOMATIC TRANSMISSION SERVICING article in TRANSMISSION SERVICING. PNP switch may also be referred to as Transaxle Range (TR) sensor. Verify system operation after performing any repairs. See SYSTEM OPERATION CHECK under TROUBLE SHOOTING.

"L" & "M" Series

  1. Connect a test light between ground and PNP switch power feed circuit (Pink wire) 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 transmission gearshift lever is in "P" position. Connect test light between ground and PNP switch signal circuit (Light Green wire) at PNP switch. If test light illuminates, go to next step. If test light does not illuminate, go to step 11 .
  3. Connect a test light between ground and PNP switch signal circuit (Light Green wire) 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 (Dark Green/White wire) at brakelight switch. Press and release brake pedal several times. If test light turns on and off with brake pedal, go to next step. If test light does not turn on and off with brake pedal, go to step 13 .
  5. Connect a test light between ground and brakelight switch signal circuit (Dark Green/White wire) at BTSI solenoid. Press brake pedal. If test light illuminates, go to next step. If test light does not illuminate, go to step 9 .
  6. Connect a test light between battery positive terminal and BTSI solenoid ground circuit (Black wire) at BTSI solenoid. If test light illuminates, go to step 15 . 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. If condition was not corrected, go to next step.
  12. Replace PNP switch.
  13. Inspect for poor connections at brakelight switch. If condition was not corrected, go to next step.
  14. Replace brakelight switch.
  15. Inspect for poor connections at BTSI solenoid. If condition was not corrected, go to next step.
  16. Replace BTSI solenoid.

"U" Series

  1. Place gearshift lever in "P" position. Turn ignition on. Using test light connected to ground, backprobe ignition feed circuit (Pink wire) at brakelight switch harness connector. If test light illuminates, go to next step. If test light does not illuminate, go to step 3 .
  2. Using test light connected to ground, backprobe BTSI solenoid ignition feed circuit (Dark Green/White wire) at brakelight switch harness connector. If test light illuminates, go to step 4 . If test light does not illuminate, go to step 5 .
  3. Repair faulty connection or open in ignition feed circuit between brakelight switch and IGN 1 (10-amp) fuse located in instrument panel fuse block.
  4. Using test light connected to ground, backprobe ignition feed circuit (Dark Green/White wire) at BTSI solenoid harness connector. If test light illuminates, go to step 6 . If test light does not illuminate, go to step 7 .
  5. Check for faulty connection at brakelight switch. Repair as necessary. If connection is okay, adjust or replace brakelight switch.
  6. Using test light connected to ground, backprobe Black wire at BTSI solenoid harness connector. If test light illuminates, go to step 9 . If test light does not illuminate, go to step 8 .
  7. Repair faulty connection or open in ignition feed circuit (Dark Green/White wire) between brakelight switch and BTSI solenoid.
  8. Check for faulty connection at BTSI solenoid. Repair as necessary. If connection is okay, replace BTSI solenoid.
  9. Disconnect TR sensor. Using test light connected to ground, probe Orange/Black wire at TR sensor harness connector. If test light illuminates, go to step 11 . If test light does not illuminate, go to next step.
  10. Repair faulty connection or open in ground circuit (Orange/Black wire) between BTSI solenoid and TR sensor.
  11. Using test light connected to battery positive terminal, probe ground circuit (Black/White wire) at TR sensor harness connector. If test light illuminates, go to next step. If test light does not illuminate, go to step 13 .
  12. Check for faulty connection at TR sensor. Repair as necessary. If connection is okay, adjust or replace TR sensor.
  13. Check for faulty connection or open in ground circuit (Black/White wire) between TR sensor and chassis ground. Repair as necessary.
  1. Turn ignition on. Disconnect BTSI solenoid harness connector. If gearshift lever can be moved from Park, go to next step. If gearshift lever cannot be moved from Park, go to step 3 .
  2. Disconnect brakelight switch harness connector. Using test light connected to ground, probe BTSI solenoid ignition feed circuit (Dark Green/White wire) at brakelight switch harness connector. If test light illuminates, go to step 4 . If test light does not illuminate, go to step 5 .
  3. Remove BTSI solenoid assembly. If gearshift lever can be moved from Park, go to step 6 . If gearshift lever cannot be moved from Park, diagnose mechanical malfunction by symptom. See SYMPTOM DIAGNOSIS under TROUBLE SHOOTING in appropriate OVERHAUL article.
  4. Repair short to voltage in BTSI solenoid ignition feed circuit (Dark Green/White wire) between brakelight switch and BTSI solenoid.
  5. Replace brakelight switch.
  6. Replace BTSI solenoid.
  1. Place gearshift lever in Park. Disconnect BTSI solenoid harness connector. Turn ignition on. If gearshift lever can be moved from Park, go to step 9 . If gearshift lever cannot be moved from Park, go to next step.
  2. Disconnect BTSI control rod. If gearshift lever can be moved from Park, go to next step. If gearshift lever cannot be moved from Park, go to step 4 .
  3. Adjust or replace BTSI solenoid.
  4. Disconnect shift cable at steering column. If gearshift lever can be moved from Park, go to next step. If gearshift lever cannot be moved from Park, go to step 7 .
  5. Reconnect shift cable at steering column. Disconnect shift cable at transaxle. If gearshift lever can be moved from Park, go to next step. If gearshift lever cannot be moved from Park, go to step 8 .
  6. Repair transaxle internal linkage.
  7. Repair linear shift assembly in steering column.
  8. Replace shift cable.
  9. Using test light connected to ground, probe BTSI solenoid ignition feed circuit (Dark Green/White wire) at BTSI solenoid harness connector. Depress brake pedal. If test light remains illuminated, leave test light connected and go to next step. If test light is not illuminated, go to step 3 .
  10. Disconnect brakelight switch harness connector. If test light remains illuminated, go to next step. If test light is not illuminated, go to step 12 .
  11. Repair short to battery voltage in ignition feed circuit (Dark Green/White wire) between BTSI solenoid and brakelight switch.
  12. Adjust or replace brakelight switch.

BRAKE TRANSMISSION SHIFT INTERLOCK SOLENOID

Note. Brake Transmission Shift Interlock (BTSI) solenoid may also be known as shift interlock actuator.

Actuator is located on steering column. (Scheme 89) Pull locking tab outward from block side of actuator. (Scheme 90) Ensure gearshift lever is in "N" position. Press on adjuster block to compress internal adjuster spring and engage adjuster teeth. Slide adjuster block as far away from solenoid as possible. Move gearshift lever into "P" position. Push locking tab back into adjuster block. Ensure proper operation of system.

Scheme 89

Scheme 89: BRAKE TRANSMISSION SHIFT INTERLOCK SOLENOID
Scheme 89: BRAKE TRANSMISSION SHIFT INTERLOCK SOLENOID

Scheme 90

Scheme 90
Scheme 90
  1. Lift cable lock button. Move gearshift lever into "P" position. Snap cable connector into shifter base. Ensure ignition switch is in ON position.
  2. Snap cable housing into ignition switch inhibitor. Turn ignition switch to LOCK position. Snap cable end onto park lock lever pin. Remove slack from cable connector. Snap cable connector lock button down.

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