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Light Sensor Circuit

NOTE: LEXUS scan tool must be used for this test.
  1. Using scan tool, check light sensor output frequency. If light sensor frequency output is 47-1200 Hertz, go to next step. If light sensor frequency output is not 47-1200 Hertz, replace light sensor and retest system operation.
  2. Check circuits for faults between light sensor and body control ECU No. 2. See WIRING DIAGRAMS . Repair or replace as necessary. If circuits are okay, check body control ECU No. 2 pin voltages. See appropriate pin voltage test under BODY CONTROL ECU PIN VOLTAGE TESTS . Replace as necessary and retest system operation.
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