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Test No. 11: Illuminated Entry System Does Not Operate

NOTE: Illuminated entry system should turn on the interior light when either front door is opened. The switch on interior light must be in DOOR position for illuminated entry system operation. After all doors are closed, the light should remain on for about 15 seconds and then fades out. Light will turn off immediately if any of the following conditions exist: all doors are closed with ignition switch in ACC or ON position, all doors are locked. Illuminated entry system should also turn on the interior light for about 15 seconds and then fade out when driver's door is unlocked with the key or remote transmitter for keyless entry system even if door is not opened.
  1. Check that retaining screw for each door courtesy switch is tight to provide good ground connection. Door courtesy switches are located on pillar post at rear of each 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 illuminated entry system operation. If illuminated entry system still does not operate, go to next step. If illuminated entry system operates, the problem was the loose retaining screw on door courtesy switch.
  2. Check each 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 illuminated entry system operation.
  3. Check wiring harness and electrical connectors between each door courtesy switch and body Electronic Control Unit (ECU). See WIRING DIAGRAMS in ILLUMINATION/INTERIOR LIGHTS article. Body ECU is located at driver's side of instrument panel on the fuse/relay box and contains an 18-pin and 20-pin electrical connector. 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 illuminated entry system operation.
  4. Check interior light. See INTERIOR LIGHT  under COMPONENT TESTS. If interior light is okay, go to next step. If interior light is defective, replace interior light assembly and recheck illuminated entry system operation.
  5. Check wiring harness and electrical connectors between battery and interior light, and between interior light and body ECU. See WIRING DIAGRAMS in ILLUMINATION/INTERIOR LIGHTS article. If necessary to check DOME fuse (15-amp), this fuse is located in fuse/relay box at driver's side front corner of engine compartment, near strut tower. 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 illuminated entry system operation.
  6. 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 illuminated entry system operation.
  7. Replace body ECU with a known-good body ECU and recheck illuminated entry system operation. If illuminated entry system operates properly, original body ECU was defective. If illuminated entry system still does not operate properly, check wiring harness and electrical connectors between body ECU and door courtesy switches and interior light for intermittent problem. See WIRING DIAGRAMS in ILLUMINATION/INTERIOR LIGHTS article. Repair wiring harness or electrical connector as necessary.
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