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DTC B1244/44: Light Sensor Circuit Malfunction

NOTE: LEXUS scan tool must be used for this test.
  1. Connect scan tool to DLC3. DLC3 connector is located under left side of instrument panel. Turn ignition on. Using scan tool, check light sensor output frequency. If frequency is 47-1200 Hz, go to next step. If frequency is not 47-1200 Hz, replace light sensor.
  2. Check circuits for faults between light sensor and body ECU. Light sensor is located under left side of instrument panel. See WIRING DIAGRAMS . Repair or replace wiring harness as necessary. If circuits are okay, replace body ECU.
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