DTC B2287: LIN Communication Master Malfunction: Procedure

1. Clear the DTC. Refer to DTC CHECK / CLEAR .
2. Recheck for DTCs.

   HINT: 

   Check the both "Smart Key" and "Power Source Control" DTCs.

   Result

   Result	Proceed to
   Only DTC B2287 is output.	A
   DTC B2287 and B2785 are output simultaneously.	B

   HINT: 

   When DTC B2287 and B2785 are output simultaneously, perform troubleshooting for DTC B2785 first.

B → See step   6 

A: Go to next step 

1. Disconnect the L6 power management control ECU and L62 certification ECU (smart key ECU assembly) connectors.
   Fig 1: Identifying Certification ECU And Power Management Control ECU Connector Terminals

   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
   L6-11 (LIN2) - L62-29 (LIN)	Always	Below 1 Ω
   L6-11 (LIN2) - Body ground	Always	10 kΩ or higher

   TEXT IN ILLUSTRATION
   
   

   *1	Front view of wire harness connector (to Certification ECU (Smart Key ECU Assembly))
   *2	Front view of wire harness connector (to Power Management Control ECU)

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Replace the power management control ECU. Refer to REMOVAL .

NEXT: Go to next step 

1. Clear the DTC. Refer to DTC CHECK / CLEAR .
2. Recheck for DTCs.

   OK

   DTC B2287 is not output.

NG → See step   5 

OK → END (POWER MANAGEMENT CONTROL ECU WAS DEFECTIVE)