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Test No. 28: Key Confinement Prevention Function Does Not Operate

NOTE: Key confinement prevention function prevents the doors from being locked if ignition key is in the ignition lock cylinder.
  1. Check door unlock detection switch on driver's side front door and passenger's side front door. See DOOR UNLOCK DETECTION SWITCH  under COMPONENT TESTS. If door unlock detection switches are okay, go to next step. If any door unlock detection switch is defective, replace door unlock detection switch and recheck operation of key confinement prevention function.
  2. Check wiring harness and electrical connectors between door unlock detection switch on driver's side front door and passenger's side front door and passenger's side Junction Block (J/B) Electronic Control Unit (ECU). See WIRING DIAGRAMS in POWER DOOR LOCKS - TRUCKS (EXCEPT SEQUOIA) article. Passenger's side J/B ECU is located at passenger's side of instrument panel. See Figure. If wiring harness and electrical connectors are okay, go to next step. If wiring harness or electrical connector are defective, repair as necessary and recheck operation of key confinement prevention function.
  3. Check that retaining screw on door courtesy switch for each door is tight to provide good ground connection. Door courtesy switches are located on pillar post at rear of door. See Figure. If retaining screw for door courtesy switch is tight and good ground connection exists, go to next step. If retaining screw for door courtesy switch is loose, tighten retaining screw and recheck operation of key confinement prevention function. If key confinement prevention function still does not operate, go to next step. If key confinement prevention function operates, the problem was the loose retaining screw on door courtesy switch.
  4. Check door courtesy switch for each door. See DOOR COURTESY SWITCH  under COMPONENT TESTS. If door courtesy switches are okay, go to next step. If any door courtesy switch is defective, replace door courtesy switch and recheck operation of key confinement prevention function.
  5. Check wiring harness and electrical connectors between each door courtesy switch and passenger's side J/B ECU. See WIRING DIAGRAMS in ILLUMINATION/INTERIOR LIGHTS article. If wiring harness and electrical connectors are okay, go to next step. If wiring harness or electrical connector are defective, repair as necessary and recheck operation of key confinement prevention function.
  6. Check power door lock control switch. See POWER DOOR LOCK CONTROL SWITCH  under COMPONENT TESTS. If power door lock control switch is okay, go to next step. If power door lock control switch is defective, replace switch and recheck operation of key confinement prevention function.
  7. Check wiring harness and electrical connectors between power door lock control switch and passenger's side J/B ECU. See WIRING DIAGRAMS in POWER DOOR LOCKS - TRUCKS (EXCEPT SEQUOIA) article. Power door lock control switch may also be referred to as door lock control switch. If wiring harness and electrical connectors are okay, go to next step. If wiring harness or electrical connector are defective, repair as necessary and recheck operation of key confinement prevention function.
  8. Check passenger's side J/B ECU for proper voltage and input signals. See PASSENGER'S SIDE JUNCTION BLOCK ELECTRONIC CONTROL UNIT  under PIN VOLTAGE TESTS. If proper voltage and input signals exist, go to next step. If proper voltage and input signals do not exist, repair as necessary and recheck operation of key confinement prevention function.
  9. Replace passenger's side J/B ECU with a known-good passenger's side J/B ECU and recheck operation of key confinement prevention function. If key confinement prevention function operates properly, original passenger's side J/B ECU was defective. If key confinement prevention function still does not operate properly, check wiring harness and electrical connectors for passenger's side J/B ECU, door unlock detection switch , door courtesy switch and power door lock control switch for intermittent problem. See WIRING DIAGRAMS in POWER DOOR LOCKS - TRUCKS (EXCEPT SEQUOIA) article. Repair wiring harness or electrical connector as necessary.
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