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Test No. 22: Illuminated Entry System Does Not Operate

WARNING: This page is about a different car, the 2002 Toyota Avalon. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: When body control ECU receives courtesy signal from either driver door ECU or front passenger door ECU, the body control ECU will turn on the illuminated entry system which consists of dome light, ignition lock cylinder light and front personal light. Ensure multiplex communication system is operating properly and no codes are present before performing this test. See MULTIPLEX CONTROL SYSTEMS - AVALON article under COMMUNICATION DEVICES in ACCESSORIES & EQUIPMENT.
  1. If multiplex control system is operating properly and no DTCs exist, go to next step. If multiplex control system is operating properly and DTCs exist, perform service procedure to repair fault. See MULTIPLEX CONTROL SYSTEMS - AVALON under COMMUNICATION DEVICES in ACCESSORIES & EQUIPMENT. After repairs, perform confirmation test. See CONFIRMATION TEST .
  2. Check light bulb for each light. Replace light bulb if defective. After repairs, perform confirmation test. See CONFIRMATION TEST . If all light bulbs are okay, go to next step.
  3. Check dome light and front personal light assemblies. If light assemblies are okay, go to next step. If either light assembly is defective, replace assembly. After repairs, perform confirmation test. See CONFIRMATION TEST .
  4. Check wiring harness and electrical connectors between battery and each light, and between each light and body control ECU. See INTERIOR LIGHTS in SYSTEM WIRING DIAGRAMS article. If wiring harnesses and electrical connectors are okay, go to next step. If wiring harnesses or electrical connectors are defective, repair as necessary. After repairs, perform confirmation test. See CONFIRMATION TEST .
  5. Open and close each door. Ensure door courtesy light comes on when each door is opened and goes off when each door is closed. If any door courtesy light does not operate properly when door is opened and closed, check and replace courtesy light bulb as required. If bulb is okay, go to next step. If door courtesy light operates properly when each door is opened and closed, go to step  9.
  6. Check suspect door courtesy switch. See DOOR COURTESY SWITCH under COMPONENT TESTS in INSTRUMENT PANELS - AVALON article in ACCESSORIES & EQUIPMENT. If suspect door courtesy switch is okay, go to next step. If suspect door courtesy switch is defective, replace door courtesy switch. After repairs have been made, perform confirmation test. See CONFIRMATION TEST .
  7. Turn ignition off. Depending on which door courtesy switch is suspect, disconnect body control ECU 25-pin connector B4 or B5 and corresponding door courtesy switch electrical harness connector. Check wiring harness and electrical connectors between suspect door courtesy switch and body control ECU. See INTERIOR LIGHTS in SYSTEM WIRING DIAGRAMS article.
    • Red/Blue wire between body control ECU 25-pin connector B4 terminal No. 5 and driver door courtesy switch. See Figure.
    • Orange wire between body control ECU 25-pin connector B5 terminal No. 3 and front passenger door courtesy switch. See Figure.
    • Red/White wire between body control ECU 25-pin connector B5 terminal No. 16 and each rear door courtesy switch. See Figure.
    If wiring harness and electrical connectors are okay for rear door courtesy switches, go to step  9. If wiring harness and electrical connectors are okay for driver and front passenger door courtesy switches, go to next step. If any wiring harness or electrical connectors are defective, repair as necessary. See INTERIOR LIGHTS in SYSTEM WIRING DIAGRAMS article. Note that Red/Blue wire of driver door courtesy switch passes through junction block No. 3 located behind left kick panel. Orange wire for front passenger door courtesy switch and Red/White wires for rear door courtesy switches pass through junction block No. 4 located behind right kick panel. After repairs have been made, perform confirmation test. See CONFIRMATION TEST .
  8. Check wiring harness and electrical connectors between suspect door courtesy light and appropriate door ECU. See INTERIOR LIGHTS in SYSTEM WIRING DIAGRAMS article.
    • For driver door courtesy light, check Red wire between driver door ECU 25-pin connector terminal No. 5 and Gray driver door courtesy light 2-pin connector terminal No. 1. Then check Red/Blue wire between driver door ECU 25-pin connector terminal No. 6 and Gray driver door courtesy light 2-pin connector terminal No. 2.
    • For front passenger door courtesy light, check Red wire between front passenger door ECU 20-pin connector terminal No. 6 and Gray front passenger door courtesy light 2-pin connector terminal No. 1. Then check Red/Blue wire between front passenger door ECU 20-pin connector terminal No. 5 and Gray front passenger door courtesy light 2-pin connector terminal No. 2.
    If wiring harness and electrical connectors are okay, go to next step. If wiring harness or electrical connectors are defective, repair as necessary. See INTERIOR LIGHTS in SYSTEM WIRING DIAGRAMS article. After repairs have been made, perform confirmation test. See CONFIRMATION TEST .
  9. Check door unlock detection switches. See DOOR UNLOCK DETECTION SWITCH under COMPONENT TESTS under POWER DOOR LOCKS WITHOUT KEYLESS ENTRY - AVALON article under DOOR LOCKS & ANTI-THEFT SYSTEMS in ACCESSORIES & EQUIPMENT. If door unlock detection switches are okay, go to next step. If any door unlock detection switch is faulty, replace detection switch. After repairs have been made, perform confirmation test. See CONFIRMATION TEST .
  10. Check wire, harnesses and connectors between door unlock detection switches and responsible door ECU. See POWER DOOR LOCKS in SYSTEM WIRING DIAGRAMS article.
    • For driver door unlock detection switch, check Light Green wire between driver door ECU 25-pin connector terminal No. 24 and Black driver door lock assembly 6-pin connector terminal No. 4. See Figure.
    • For front passenger door unlock detection switch, check Yellow wire between front passenger door ECU 20-pin connector terminal No. 4 and Black front passenger door lock assembly 6-pin connector terminal No. 4. See Figure.
    • For rear door unlock detection switches, check Blue/Orange wire between body control ECU 25-pin connector B5 terminal No. 5 and Black left rear door lock assembly 4-pin connector terminal No. 3 or Black right rear door lock assembly 4-pin connector terminal No. 2. See Figure.
    If wires, harnesses and connectors are okay, go to next step. Repair any defective wire, harness or connector as required. See POWER DOOR LOCKS in SYSTEM WIRING DIAGRAMS article. After repairs have been made, perform confirmation test. See CONFIRMATION TEST .
  11. Check body control ECU ground circuits. See BODY COMPUTER in SYSTEM WIRING DIAGRAMS article. If ground circuits are faulty, repair and retest system. If ground circuits are okay, substitute original body control ECU with a known-good unit and recheck system operation. If system operates properly, original body control ECU was defective. If system still does not operate properly, perform body control ECU pin voltage check. See BODY CONTROL ELECTRONIC CONTROL UNIT  under PIN VOLTAGE TESTS. Check wiring harness and electrical connectors for an intermittent problem. Repair wiring harnesses or connectors as necessary. If voltage values, harnesses and connectors are okay, replace body control ECU. After repairs, perform confirmation test. See CONFIRMATION TEST . If symptom is still present, go to next step.
  12. Check wiring harness and electrical connectors between battery and driver side junction block, driver side junction block and body control ECU, between driver side junction block and dome light, front personal light and ignition key cylinder light, between driver side junction block and driver door ECU and front passenger door ECU, between body control ECU and driver door ECU, between body control ECU and front passenger door ECU, between driver door ECU and front passenger door ECU, between body control ECU and rear door unlock detection switches and all power and ground connections. See INTERIOR LIGHTS in SYSTEM WIRING DIAGRAMS article. If wiring harnesses or electrical connectors are defective, repair as necessary. After repairs, perform confirmation test. See CONFIRMATION TEST .
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