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Test No. 59: Only One Power Door Lock Does Not Operate

  1. Check door lock motor on the inoperative door lock. See DOOR LOCK MOTOR  under COMPONENT TESTS. If door lock motor is okay, go to next step. If door lock motor is defective, replace door lock assembly and recheck door lock operation.
  2. Check wiring harness and electrical connectors between door lock motor and body Electronic Control Unit (ECU). See WIRING DIAGRAMS in KEYLESS ENTRY SYSTEMS - AVALON article. 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. Repair wiring harness or electrical as necessary and recheck door lock operation.
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