DTC B2251: Back Door Closer Switch Malfunction: Procedure

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG).
3. Turn the Techstream on.
4. Enter the following menus: Body Electrical / Back Door / Data List.
5. Check if the switch functions properly.
   BACK DOOR (POWER BACK DOOR ECU (POWER BACK DOOR MOTOR UNIT))
   
   

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

   OK

   The display is as specified in the normal condition column.

NG → See step   2 

OK → See step   5 

1. Remove the back door lock assembly. Refer to REMOVAL .
2. Measure the resistance according to the value(s) in the table below.
   Fig 1: Operation Of The Door Courtesy Switch

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   8 (CTY) - 7 (E)	Open-latch	Below 1 Ω
   8 (CTY) - 7 (E)	Half-latch	Below 1 Ω
   8 (CTY) - 7 (E)	Full-latch	10 kΩ or higher

NG → See step   4 

OK: Go to next step 

1. Disconnect the Y10 back door lock connector and P33 ECU connector.
   Fig 2: Y10 Back Door Lock Connector And P33 ECU Connector

   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
   Y10-8 (CTY) - P33-20 (FUL)	Always	Below 1 Ω
   Y10-7 (E) - Body ground	Always	Below 1 Ω
   Y10-8 (CTY) - Body ground	Always	10 kΩ or higher

   TEXT IN ILLUSTRATION
   
   

   *1	Front view of wire harness connector (to Back Door Lock Assembly)
   *2	Front view of wire harness connector (to Power Back Door ECU (Power Back Door Motor Unit))

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   5