DTC B1296: Front Light ECU Communication Stop: Procedure

1. Disconnect the 2E and 2F connectors.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   2E-4 (FMB3) - Body ground	Always	11 to 14 V

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   2F-1 (E) - Body ground	Always	Below 1 Ω

   TEXT IN ILLUSTRATION
   
   

   *1	Front view of wire harness connector (to Front Controller (Engine Room Junction Block No. 2))

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Disconnect the A30 and J55 connectors.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   2F-6 (MPX2) - A30-17 (MPX2)	Always	Below 1 Ω
   2F-5 (MPX1) - J55-24 (MPX2)	Always	Below 1 Ω

   TEXT IN ILLUSTRATION
   
   

   *1	Front view of wire harness connector (to Front Controller (Engine Room Junction Block No. 2))
   *2	Front view of wire harness connector (to Main Body ECU LH)
   *3	Front view of wire harness connector (to Power Source Control ECU)

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Replace the front controller (engine room relay block No. 2).

NEXT: Go to next step 

1. Clear the DTC. Refer to DTC CHECK / CLEAR [08/2012 - ] .
2. Recheck for DTCs.

   OK

   DTC B1296 is not output.

NG → See step   5 

OK → END (FRONT CONTROLLER WAS DEFECTIVE)