DTC B2251: Back Door Closer Switch Malfunction: Procedure

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON.
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)
   
   

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

   OK

   The display is as specified in the normal condition column.

   RESULT
   
   

   Result	Proceed to
   NG	A
   OK	B

B → See step   4 

A: Go to next step 

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: Inspecting Back Door Lock Assembly (Back Door Courtesy Switch)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   TEXT IN ILLUSTRATION
   
   

   *1	Drive Gear	-	-
   *a	Component without harness connected (Back Door Lock Assembly)	*b	Release
   *c	Close	*d	Over-latch
   *e	Full-latch	*f	Half-latch
   *g	Open-latch	*h	Back Door Courtesy Switch
   *i	ON	*j	OFF

   Standard Resistance

   BACK DOOR COURTESY SWITCH
   
   

   Tester Connection	Condition	Specified Condition
   3 (CTY) - 4 (E)	Open-latch	Below 1 Ω
   	Half-latch	Below 1 Ω
   	Full-latch	10 kΩ or higher
   	Over-latch	10 kΩ or higher

NG → See step   5 

OK: Go to next step 

1. Disconnect the W11 back door lock assembly connector and K14 power back door ECU connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   W11-3 (CTY) - K14-20 (FUL)	Always	Below 1 Ω
   W11-4 (E) - Body ground	Always	Below 1 Ω
   W11-3 (CTY) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   4