DTC B1244: Light Sensor Circuit Malfunction [09/2013 - ]: Procedure

1. Clear the DTCs. Refer to DTC CHECK / CLEAR [09/2013 - ] .

NEXT: Go to next step 

1. Check for DTCs. Refer to DTC CHECK / CLEAR [09/2013 - ] .

   OK

   DTC B1244 output does not occur.

NG → See step   3 

OK → See step   8 

1. Using the Techstream, read the Data List. Refer to DATA LIST / ACTIVE TEST [09/2013 - ] .
   MAIN BODY
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   Illumination Rate Info	Illumination rate information / 0 ms. to 2162.65 ms.	Value output according to ambient light levels	-

   OK

   Normal condition listed above is displayed.

NG → See step   4 

OK → REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY) 

1. Disconnect the E16 main body ECU connector.
2. Disconnect the F2 automatic light control sensor connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   E16-14 (CLTE) - F2-3 (CLTE)	Always	Below 1 Ω
   E16-15 (CLTS) - F2-4 (CLTS)	Always	Below 1 Ω
   E16-16 (CLTB) - F2-1 (CLTB)	Always	Below 1 Ω
   E16-14 (CLTE) - Body ground	Always	10 kΩ or higher
   E16-15 (CLTS) - Body ground	Always	10 kΩ or higher
   E16-16 (CLTB) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Remove the main body ECU with the connectors still connected.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

2. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   E16-16 (CLTB) - E16-14 (CLTE)	Power switch off	Below 1 V
   	Power switch on (IG)	11 to 14 V

   TEXT IN ILLUSTRATION
   
   

   *a	Component with harness connected (Main Body ECU [Instrument Panel Junction Block Assembly])

NG → REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY) 

OK: Go to next step 

1. Check the automatic light control sensor. Refer to ON-VEHICLE INSPECTION [09/2013 - ] .

NG → See step   7 

OK → REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)