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Home >> Lexus >> 1995 >> LS 400 >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> A/C-Heater System - Automatic >> Trouble Shooting >> Code 23 - Pressure Switch Circuit

Code 23 - Pressure Switch Circuit

  1. Remove A/C-heater control assembly, leaving harness connectors attached. See A/C-HEATER CONTROL ASSEMBLY  under REMOVAL & INSTALLATION. Install manifold gauge set. Turn ignition on.
  2. Backprobe A/C-heater control assembly connector between terminal A18-1 (Blue/Black wire) and ground. See Figure.
  3. Start engine. Turn blower and A/C on. Battery voltage should exist with low side pressure less than 28 psi (2.0 kg/cm2 ). If voltage is as specified, temporarily substitute known-good A/C-heater control assembly, then retest system.
  4. If voltage is not as specified, test pressure switch. See PRESSURE SWITCH TEST  under TESTING. Replace pressure switch as necessary. If switch is okay, go to next step.
  5. Inspect wiring harness and connectors between pressure switch and A/C-heater control assembly. Repair as necessary. If wiring harness and connectors are okay, temporarily substitute known-good A/C-heater control assembly. Retest system.
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