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Home >> Lexus >> 1998 >> GS 400 >> Repair and Diagnosis (Single Page) >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> A/C-Heater System >> Self-Diagnostics >> Code 22: Compressor Lock Sensor Circuit
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Code 22: Compressor Lock Sensor Circuit

  1. Access Engine Control Module (ECM) located at left front corner of engine compartment. Leave harness connectors attached. See Fig 1. Start engine. Press AUTO and A/C buttons to ON position.
  2. On GS300, backprobe ECM connector terminal E2-29 (Gray wire) and ground. See Fig 1. On GS400, backprobe ECM connector terminal E7-21 (Gray wire) and ground. On all models, battery voltage should exist.
  3. If battery voltage exists, no problem is indicated at this time. If battery voltage does not exist, test compressor lock sensor. See COMPRESSOR LOCK SENSOR  under TESTING. If sensor is okay, go to next step. Replace sensor as necessary.
  4. Inspect wiring harness and connectors between A/C control assembly, ECM, and A/C compressor lock sensor. Repair harness and connectors as necessary. If wiring harness and connectors are okay, temporarily substitute known-good ECM and/or A/C control assembly, and retest system.
Fig 1: Checking Compressor Lock Sensor Circuit
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