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Home >> Lexus >> 1995 >> SC 400 >> Repair and Diagnosis (Single Page) >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> A/C-Heater System >> Testing >> Compressor Circuit Test >> Compressor Clutch Test
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Compressor Clutch Test

  1. Unplug compressor clutch connector. Apply battery voltage to terminal No. 4 (Blue wire) of compressor clutch connector. Connect negative lead to ground. If compressor clutch does not engage, repair or replace compressor clutch.
  2. If compressor clutch engages, inspect wiring and connectors between compressor clutch relay and compressor. Repair as necessary. If harness and connectors are okay, test A/C pressure switch. See CODE 23 - PRESSURE SWITCH CIRCUIT  under TROUBLE SHOOTING.
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