DTC U1331: Software Incompatibility with Body Control Module "B" [12/2015 - 11/2017]: Procedure

1. Check the main body ECU part number.
   1. Check if the part number of the main body ECU installed on the vehicle is correct.

      OK

      The parts number is correct.

Result: 

NG 

REPLACE MAIN BODY ECU 

(Refer to REMOVAL [12/2015 - ] )

Result: 

OK 

See step  2

1. Clear the DTCs (Refer to DTC CHECK / CLEAR [12/2015 - 11/2017] ).
2. Recheck for DTCs and check if the same DTC is output again.
   RESULT
   
   

   Result	Proceed to
   No DTC is output	A
   DTC is output from the blind spot monitor sensor RH (Master)	B
   DTC is output from the blind spot monitor sensor LH (Slave)	C

Result: 

A 

USE SIMULATION METHOD TO CHECK 

(Refer to HOW TO PROCEED WITH TROUBLESHOOTING [12/2015 - 08/2016] , or refer to HOW TO PROCEED WITH TROUBLESHOOTING [08/2016 - 11/2017] )

Result: 

B 

REPLACE BLIND SPOT MONITOR SENSOR RH 

(Refer to REMOVAL [12/2015 - 11/2017] )

Result: 

C 

REPLACE BLIND SPOT MONITOR SENSOR LH 

(Refer to REMOVAL [12/2015 - 11/2017] )