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Test No. 31: Power Door Lock System Does Not Operate When Using The Key

  1. Check key unlock warning switch. See KEY UNLOCK WARNING SWITCH  under COMPONENT TESTS. If key unlock warning switch is okay, go to next step. If key unlock warning switch is defective, replace key unlock warning switch and recheck power door lock system operation. See KEY UNLOCK WARNING SWITCH  under REMOVAL & INSTALLATION.
  2. Check key unlock warning switch circuit by checking Red/Yellow wire and electrical connectors between terminal No. 2 at key unlock warning switch and terminal No. 17 at electrical connector B4 at body Electronic Control Unit (ECU). See WIRING DIAGRAMS in KEYLESS ENTRY SYSTEMS - AVALON article. Key unlock warning switch may also be referred to as unlock switch. Body ECU is located at driver's side of instrument panel on the fuse/relay box. See Figure. Electrical connector B4 (25-pin) and electrical connector B5 (25-pin) are located at each side of body ECU and a 12-pin electrical connector at rear of body ECU. See Figure. For electrical connector B4 location and terminal identification, 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 power door lock system operation.
  3. 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 or input signal does not exist, repair as necessary and recheck power door lock system operation.
  4. Replace body ECU with a known-good body ECU and recheck power door lock system operation. If power door lock system operation system operates properly, original body ECU was defective. If power door lock system still does not operate properly, check wiring harness and electrical connectors for body ECU and power door lock system for an intermittent problem. See WIRING DIAGRAMS in KEYLESS ENTRY SYSTEMS - AVALON article. Repair wiring harness or electrical connector as necessary. It may also be necessary to check for a disconnected linkage rod at door lock assembly in the door.
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