Inspection Procedure

1. Clear the DTC (see DTC CHECK / CLEAR  ).
2. Recheck for DTC (see DTC CHECK / CLEAR  ).

   OK: DTC B1244 is not output. 

NG: Go to step 2 

OK: USE SIMULATION METHOD TO CHECK  (See HOW TO PROCEED WITH TROUBLESHOOTING )

1. Operate the Techstream according to the display and select "DATA LIST" or "Data List".
   1. Techstream

      Main Body 

      MAIN BODY - TECHSTREAM DATA LIST CHART
      
      

      Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
      Illumination Rate	Illumination rate / min.: 0, max.: 99.99	Actual illumination rate is displayed	-

      OK: Output illuminance is as shown in table above. 

NG: Go to step 3 

OK: REPLACE MAIN BODY ECU 

1. Disconnect the J3 ECU connector.
Fig 1: Identifying Main Body ECU Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the voltage according to the value(s) in the table below.

   Standard voltage 

   MAIN BODY ECU (LIGHT CONTROL SENSOR VOLTAGE)
   
   

   Tester Connection	Switch Condition	Specified Condition
   J3-20 (CLTB) - J3-18 (CLTE)	Ignition switch ON	11 to 14 V
   	Ignition switch OFF	Below 1 V

NG: REPLACE MAIN BODY ECU 

OK: Go to next step 

1. Disconnect the J3 ECU connector.
2. Disconnect the K19 sensor connector.
   Fig 2: Identifying Main Body ECU And Automatic Light Control Sensor Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Measure the resistance according to the value(s) in the table below.

   Standard resistance 

   MAIN BODY ECU - AUTOMATIC LIGHT CONTROL SENSOR
   
   

   Tester Connection	Condition	Specified Condition
   J3-20 (CLTB) - K19-6 (CLTB)	Always	Below 1 Ω
   J3-19 (CLTS) - K19-5 (CLTS)
   J3-18 (CLTE) - K19-3 (CLTE)
   J3-20 (CLTB) - Body ground	Always	10 kΩ or higher
   J3-19 (CLTS) - Body ground
   J3-18 (CLTE) - Body ground

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: REPLACE AUTOMATIC LIGHT CONTROL SENSOR  (see REMOVAL  )