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Test No. 29: Automatic Lock Function Operates Even If Door Is Opened Within 30 Seconds After All Doors Are Unlocked Using Keyless Entry System

NOTE: Automatic lock function allows 30 seconds to open the door once the door is unlocked with the keyless remote or the door will be locked again.
  1. Open each door and check that door courtesy light comes on when door is opened and goes off when door is closed. If any door courtesy light does not operate properly when door is open and closed, go to next step. If door courtesy light operates properly when each door is open and closed, go to step  4.
  2. Check door courtesy switch. See DOOR COURTESY SWITCH  under COMPONENT TESTS. If door courtesy switch is okay, go to next step. If door courtesy switch is defective, replace door courtesy switch and recheck operation of automatic lock function.
  3. Check wiring harness and electrical connectors between door courtesy switch and body Electronic Control Unit (ECU), and between door courtesy light and body ECU. See WIRING DIAGRAMS in ILLUMINATION/INTERIOR LIGHTS article. Body ECU may also be referred to as integration relay. Body ECU is located at driver's side of instrument panel on the fuse/relay box. See Figure. Electrical connector I13 (7-pin or 25-pin) and electrical connector I16 (18-pin) are located at body ECU and a 12-pin electrical connector is located at rear of body ECU. See Figure. If wiring harness and electrical connectors are okay, go to next step. If wiring harness or electrical connector is defective, repair as necessary and recheck operation of automatic lock function.
  4. Check body Electronic Control Unit (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 automatic lock function.
  5. Replace body ECU with a known-good body ECU and recheck operation of automatic lock function. If automatic lock function operates properly, original body ECU was defective. If automatic lock function still does not operate properly, check wiring harness and electrical connectors for body ECU for an intermittent problem. See WIRING DIAGRAMS in KEYLESS ENTRY SYSTEMS - SIENNA article. Repair wiring harness or electrical connector as necessary.
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