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Automatic Light Control Sensor Circuit: Notes

NOTE: Testing information for RX300 is not available from manufacturer.
  1. Turn ignition off. Disconnect automatic light control sensor harness connector. Check circuit values at appropriate terminals of automatic light control sensor harness connector. See Figure-Figure . Ensure circuit values are as specified. See appropriate SENSOR CIRCUIT VALUES table. If circuit values are as specified, go to next step. If circuit values are not as specified, check and repair affected circuit. See appropriate wiring diagram in HEADLIGHT SYSTEMS article.
  2. Reconnect automatic light control sensor harness connector. Turn ignition on. Turn light control switch to AUTO position, and ensure vehicle surroundings are bright. Check circuit values by backprobing at appropriate terminals of automatic light control sensor harness connector. See Figure-Figure . Ensure circuit values are as specified. See appropriate SENSOR CIRCUIT VALUES table. If circuit values are as specified, replace automatic light control sensor. If circuit values are not as specified, check and repair affected circuit. See appropriate wiring diagram in HEADLIGHT SYSTEMS article.
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