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Shift Lock Does Not Release

  1. Ensure brakelight turns on when brake pedal is depressed. If brakelights fail to turn on, check and repair brakelight system as required. If brake lights turn on, ensure 10 volts minimum is present across pin No. 3 of control unit and vehicle ground. If voltage is not within specifications, check and repair harness or faulty connector between main fuse and control unit.
  2. If voltage is within specifications, check voltage across pin No. 4 of control unit and vehicle ground. Voltage should be 10 volts minimum when brake pedal is depressed. If voltage is not within specifications, check and repair harness or faulty connector contact between brake light switch and control unit.
  3. Ensure voltage across pin No. 1 of control unit and vehicle ground is 10 volts minimum when ignition switch is turned on. If voltage is not within specifications, check fuse. If fuse is okay, check and repair harness or faulty connector contact between ignition switch and control unit. If voltage is within specifications, turn ignition switch to OFF position. Disconnect connector from shift lock control unit.
  4. Check for continuity between pin No. 2 of connector B69/R47 and vehicle ground. Place shift selector lever is in "P" position. If continuity does not exist, check inhibitor switch and/or repair harness. If continuity exists, measure resistance between pin No. 1 of connector B69/R47 and vehicle ground.
  5. If resistance is greater than 20 ohms, shift lock solenoid circuit is shorted. Check and repair harness or faulty connector contact between shift lock solenoid and connector B69/R47. If resistance is less than 10 ohms, shift lock solenoid is shorted or poorly grounded. After repairs are completed, recheck solenoid operation. If malfunction is still present, replace shift lock control unit.
  6. Ensure resistance between pin No. 10 of connector B69/R47 and vehicle ground is less than 10 ohms. If resistance is not less than 10 ohms, control unit ground circuit is open or has poor connector contact. If resistance is less than 10 ohms, replace shift lock control unit.
NOTE: For shift and key interlock system wiring diagram, see appropriate wiring diagram in WIRING DIAGRAMS  .
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