DTC B1244: Light Sensor Circuit Malfunction [02/2014 - ]: Procedure

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG).
3. Turn the Techstream on.
4. Enter the following menus: Body Electrical / Main Body / Data List.
5. Read the display on the Techstream.

   Body Electrical > Main Body > Data List 

   Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
   Light Sensor Illuminance	Light control sensor illuminance	0 to 8191 lx	Value is output according to ambient light level	-

   Body Electrical > Main Body > Data List 

   Tester Display
   Light Sensor Illuminance

   OK

   Normal condition listed above is displayed.

   Result

   Proceed to
   OK
   NG

Result:  1

OK 

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to  REMOVAL [02/2014 - 11/2016]  Refer to  REMOVAL [11/2016 - ] 

Result:  2

NG 

See step  2

1. Disconnect the G4 automatic light control sensor connector.
2. Disconnect the F19 main body ECU (multiplex network body ECU) connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   F19-21 (CLTE) - G4-2 (CLTE)	Always	Below 1 Ω
   F19-20 (CLTS) - G4-4 (CLTS)	Always	Below 1 Ω
   F19-19 (CLTB) - G4-1 (CLTB)	Always	Below 1 Ω
   F19-21 (CLTE) - Body ground	Always	10 kΩ or higher
   F19-20 (CLTS) - Body ground	Always	10 kΩ or higher
   F19-19 (CLTB) - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result:  2

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result:  1

OK 

See step  3

1. Reconnect the F19 main body ECU (multiplex network body ECU) connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Component with harness connected (Main Body ECU (Multiplex Network Body ECU))

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

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   F19-19 (CLTB) - F19-21 (CLTE)	Power switch off, dimmer switch off, 2 minutes after all doors closed	Below 1 V
   	Power switch on (IG)	11 to 14 V

   Result

   Proceed to
   OK
   NG

Result:  1

OK 

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to  REMOVAL [02/2014 - 11/2016]  Refer to  REMOVAL [11/2016 - ] 

Result:  2

NG 

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to  REMOVAL [02/2014 - 11/2016]  Refer to  REMOVAL [11/2016 - ]