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Home >> Toyota >> 2003 >> Matrix Base, FWD, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 133 (Multiplex Communication System) >> Diagnostic Tests >> DTC B1244/44: Light Sensor Circuit Malfunction >> Diagnostic Procedure
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Diagnostic Procedure

WARNING: This page is about a different car, the 2003 Lexus RX 300 and 2002 Lexus RX 300. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: If not using the hand-held tester, see AUTOMATIC HEADLIGHTS & LIGHTING article under HEADLIGHTS in ACCESSORIES & EQUIPMENT.
  1. Check the light sensor. Connect the hand-held tester to the DLC3. Turn the ignition switch ON and hand-held tester main switch ON. The value of the illumination rate should change in the following range when the light sensor is put in the light or covered by a hand. The time that it takes for the light sensor to generate 1 cycle of frequency according to the brightness should be 0.8-22.0 ms. Check it by putting the light control switch in AUTO position. If the results are as specified, go to the next step. If the results are not good, replace the light sensor.
  2. Check the wiring harness and connector between the light sensor and body ECU. If the results are OK, replace the body ECU. See INSTRUMENT PANEL article in ACCESSORIES & EQUIPMENT. If the results are not good, repair or replace the wiring harness or connector.
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