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Home >> Lexus >> 2000 >> ES 300 >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> Automatic A/C-Heater Systems >> System Tests >> Back-Up Power Circuit

Back-Up Power Circuit

  1. Turn ignition off. Inspect ECU-B fuse at fuse block at left side of engine compartment. If fuse is okay, go to next step. If fuse is blown, correct cause and replace fuse.
  2. Remove A/C control assembly, leaving harness connectors connected. Turn ignition on. Backprobe between A/C control assembly connector terminal A14-13 (White/Black wire) and ground. See Figure. If battery voltage does not exist, repair White/Black wire between connector and ECU-B fuse.
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