Inspection Procedure

1. Clear the DTC (see DTC CHECK / CLEAR  ).

1. Check for DTC (see DTC CHECK / CLEAR  ).

   OK: DTC B1244 output does not occur. 

NG: Go to step 3 

OK: NORMAL 

1. Using the intelligent tester or Techstream, read the Data List.
   1. Intelligent tester

      MAIN BODY 

      INTELLIGENT TESTER - MAIN BODY
      
      

      Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
      ILLUMINATE RAT	Condition of automatic light control sensor/0 to 235600 Ix	Condition value will be displayed	-

   2. Techstream

      Main Body 

      TECHSTREAM - MAIN BODY
      
      

      Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
      Illumination Rate Info	Condition of automatic light control sensor/0 to 235600 Ix	Condition value will be displayed	-

      OK : 

      Output illuminance is as shown in table above. 

NG: Go to step 4 

OK: REPLACE MAIN BODY ECU 

1. Measure the voltage according to the value(s) in the table below.
   Fig 1: Checking Main Body ECU (CLTB - CLTE Voltage)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard voltage 

   MAIN BODY ECU (CLTB - CLTE VOLTAGE)
   
   

   Tester Connection	Switch Condition	Specified Condition
   L12-20 (CLTB) - L12-18 (CLTE)	Engine switch on (IG)	11 to 14 V

NG: REPLACE MAIN BODY ECU 

OK: GO TO NEXT STEP 

1. Disconnect the L12 ECU connector.
2. Disconnect the M2 sensor connector.
3. Measure the resistance according to the value(s) in the table below.
   Fig 2: Checking Harness And Connector (Main Body ECU - Automatic Light Control Sensor)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard resistance 

   MAIN BODY ECU - AUTOMATIC LIGHT CONTROL SENSOR
   
   

   Tester Connection	Condition	Specified Condition
   L12-20 (CLTB) - M2-6 (CLTB)	Always	Below 1 Ω
   L12-19 (CLTS) - M2-5 (CLTS)
   L12-18 (CLTE) - M2-3 (CLTE)
   L12-20 (CLTB) - Body ground	Always	10 kΩ or higher
   1.12-19 (CLTS) - Body ground
   L12-18 (CLTE) - Body ground

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: REPLACE AUTOMATIC LIGHT CONTROL SENSOR (See  REMOVAL   )