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Test No. 8: Only One Illumination Light Does Not Light Up

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.
  1. Remove and inspect suspect light bulb. Replace light bulb as required. After repairs have been made, perform confirmation test. See CONFIRMATION TEST . If light bulb is okay, go to next step.
  2. Test light control rheostat. See LIGHT CONTROL RHEOSTAT  under COMPONENT TESTS. If light control rheostat is okay, go to next step. If light control rheostat is not okay, replace light control rheostat. See LIGHT CONTROL RHEOSTAT  under REMOVAL & INSTALLATION. After repairs have been made, perform confirmation test. See CONFIRMATION TEST .
  3. Turn ignition off. Disconnect 13-pin electrical harness connector 1A from front of driver side junction block. See Figure. Remove instrument cluster 22-pin electrical harness connector C9 and multi-display information center 22-pin electrical harness connector M3. See Figure. Check Green wire between driver side junction block 13-pin electrical harness connector 1A terminal No. 4 and instrument cluster 22-pin electrical harness connector C9 terminal A16 and multi-display information center 22-pin electrical harness connector M3 terminal A3. See INTERIOR LIGHTS in SYSTEM WIRING DIAGRAMS article. If circuit is okay, go to next step. If circuit is faulty, repair and retest system. After repairs have been made, perform confirmation test. See CONFIRMATION TEST .
  4. Turn ignition off. Remove light control rheostat. Light control rheostat is incorporated into heating and ventilation register on left side of instrument panel. Disconnect 3-pin electrical harness connector from rheostat. Remove instrument cluster 22-pin electrical harness connector C9 and multi-display information center 22-pin electrical harness connector M3. See Figure. Check White/Green wire between light control rheostat 3-pin electrical harness connector terminal No. 2, instrument cluster 22-pin electrical harness connector C9 terminal A19 and multi-display information center 22-pin electrical harness connector M3 terminal A10. See INTERIOR LIGHTS in SYSTEM WIRING DIAGRAMS article. If circuit is faulty, repair and retest system. If circuit is okay, replace instrument cluster and/or multi-display information center. After repairs have been made, perform confirmation test. See CONFIRMATION TEST .
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