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Test No. 12: 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 door and passenger's 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 each door unlock detection switch and body Electronic Control Unit (ECU), and between door unlock detection switch and ground connection. See WIRING DIAGRAMS in POWER DOOR LOCKS WITHOUT KEYLESS ENTRY - CARS article. Body ECU is located behind driver's side of instrument panel and contains 18-pin and 25-pin electrical connectors. See Figure. For body ECU electrical terminal identification, 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 body ECU. See WIRING DIAGRAMS in POWER DOOR LOCKS WITHOUT KEYLESS ENTRY - CARS 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 body ECU, and between power door lock control switch and ground connection. See WIRING DIAGRAMS in POWER DOOR LOCKS WITHOUT KEYLESS ENTRY - CARS 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 body ECU for proper voltage and input signals. See BODY 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 body ECU with a known-good body ECU and recheck operation of key confinement prevention function. If key confinement prevention function operates properly, original body ECU was defective. If key confinement prevention function still does not operate properly, check wiring harness and electrical connectors for body ECU, door unlock detection switch, door courtesy switches and power door lock control switch for intermittent problem. See WIRING DIAGRAMS in POWER DOOR LOCKS WITHOUT KEYLESS ENTRY - CARS article. Repair wiring harness or electrical connector as necessary.
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