DTC B2251: Back Door Closer Switch Malfunction [12/2019 - 11/2023]: Procedure

1. Read the Data List according to the display on the GTS.

   Body Electrical > Back Door > Data List 

   Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
   Courtesy SW	Latch courtesy switch signal	OFF or ON	OFF: Back door closed ON: Back door open	-

   Body Electrical > Back Door > Data List 

   Tester Display
   Courtesy SW

   OK

   The display is as specified in the normal condition column.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE MULTIPLEX NETWORK DOOR ECU. Refer to  REMOVAL [12/2019 - 11/2023] 

Result: 

NG 

See step  2

Refer to INSPECTION [12/2019 - ]

Result

Result: 

NG 

REPLACE BACK DOOR LOCK WITH COURTESY LIGHT SWITCH ASSEMBLY. Refer to  REMOVAL [12/2019 - ] 

Result: 

OK 

See step  3

1. Disconnect the 4D instrument panel junction block assembly connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   W14-4 (CTY) - W18-11 (FUL)	Always	Below 1 Ω
   W14-1 (E) - Body ground	Always	Below 1 Ω
   W14-4 (CTY) or W18-11 (FUL) - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE MULTIPLEX NETWORK DOOR ECU. Refer to  REMOVAL [12/2019 - 11/2023] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR