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LS400 A/C Pressure Switch

  1. Install A/C pressure gauge set. To access pressure switch , remove right headlight. Pressure switch is in-line with A/C receiver. Turn A/C selector switch to OFF position. High side pressure should be 142 psi (10 kg/cm2 ) or less.
  2. Disconnect switch terminal connector. Using a DVOM, check for continuity between switch terminals No. 2 (ohmmeter positive lead) and No. 3 (ohmmeter negative lead). See Figure-32.
  3. Turn A/C selector switch to ON position. High side pressure should be 192 psi (13.5 kg/cm2 ) or more. No continuity should exist between switch terminals No. 2 and No. 3. If A/C pressure switch continuity is not correct, replace switch.
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