B2251

DOOR / HATCH: BACK DOOR CLOSER SYSTEM: B2251: Back Door Closer Switch Malfunction
B2251 - Back Door Closer Switch Malfunction

DESCRIPTION

The power back door ECU (power back door motor unit)*1 or back door closer ECU (multiplex network door ECU)*2 receives signals from the latch switch, sector switch and back door courtesy switch, which are built into the back door lock. Based on these switch signals, the latch position of the back door lock is determined.





* *1: w/ Power Back Door System

* *2: w/o Power Back Door System

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. READ VALUE USING TECHSTREAM (BACK DOOR COURTESY SWITCH)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / Back Door / Data List.

(e) Check if the switch functions properly.

Back Door (Power Back Door ECU*1 or Back Door Closer ECU*2)





*1: w/ Power Back Door System

*2: w/o Power Back Door System

OK:

The display is as specified in the normal condition column.

Result:





C -- REPLACE BACK DOOR CLOSER ECU (MULTIPLEX NETWORK DOOR ECU)

B -- REPLACE POWER BACK DOOR ECU (POWER BACK DOOR MOTOR UNIT) Removal
A -- Continue to next step.

2. INSPECT BACK DOOR LOCK ASSEMBLY (BACK DOOR COURTESY SWITCH)

(a) Remove the back door lock assembly Removal.

(b) Measure the resistance according to the value(s) in the table below.





Standard Resistance:

Back Door Courtesy Switch





NG -- REPLACE BACK DOOR LOCK ASSEMBLY Removal
OK -- Continue to next step.

3. CHECK HARNESS AND CONNECTOR (BACK DOOR LOCK - POWER BACK DOOR ECU OR BACK DOOR CLOSER ECU)

(a) w/ Power Back Door System





(1) Disconnect the R1 back door lock assembly connector and L20 power back door ECU connector.

(2) Measure the resistance according to the value(s) in the table below.

Standard Resistance:





Text in Illustration





(b) w/o Power Back Door System





(1) Disconnect the R1 back door lock assembly connector and L21 back door closer ECU connector.

(2) Measure the resistance according to the value(s) in the table below.

Standard Resistance:





Text in Illustration





Result:





C -- REPLACE BACK DOOR CLOSER ECU (MULTIPLEX NETWORK DOOR ECU)

B -- REPLACE POWER BACK DOOR ECU (POWER BACK DOOR MOTOR UNIT) Removal

A -- REPAIR OR REPLACE HARNESS OR CONNECTOR