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Test Ad: Heating Ventilation Air Conditioning Controller Illumination Inoperative

  1. Turn ignition switch to LOCK position. Disconnect Heating Ventilation Air Conditioning (HVAC) controller harness connector C236. Turn headlight switch to ON position. Rotate headlight switch thumbwheel to brightest position. Measure voltage between ground and HVAC controller harness connector C236 terminal No. 2 (Light Blue/Red wire). If battery voltage exists, go to next step. If battery voltage does not exist, repair open in Light Blue/Red wire between HVAC controller and central junction box fuse No. 37 (5-amp). See POWER DISTRIBUTION article in WIRING DIAGRAMS.
  2. Turn headlight switch to OFF position. Measure resistance between ground and HVAC controller harness connector C236 terminal No. 1 (Black wire). If resistance is 5 ohms or less, go to next step. If resistance is more than 5 ohms, repair open in Black wire between HVAC controller harness connector and ground. Ground point is located behind center of instrument panel. See GROUND DISTRIBUTION article in WIRING DIAGRAMS.
  3. Check and replace HVAC controller indicator bulbs as necessary. See REMOVAL & INSTALLATION  .
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