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Back Door Cannot Be Opened








DOOR / HATCH: BACK DOOR CLOSER SYSTEM: Back Door cannot be Opened

Back Door cannot be Opened

DESCRIPTION

When the back door cannot be opened, one of the following may be malfunctioning: 1) power back door ECU (power back door motor unit)*1 or back door closer ECU (multiplex network door ECU)*2, 2) back door lock assembly, 3) back door opener switch assembly, or 4) main body ECU (driver side junction block assembly).

- *1: w/ Power Back Door System
- *2: w/o Power Back Door System

WIRING DIAGRAM





INSPECTION PROCEDURE
NOTICE: The back door closer system uses CAN communication. First, follow "How to Proceed with Troubleshooting" and at step "Check Communication Function of CAN Communication System", confirm that there is no malfunction in the CAN communication system. After confirming that B2250 or B2251 is not output, proceed with troubleshooting.

PROCEDURE

1. READ VALUE USING TECHSTREAM
(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 / Main Body / Data List.
(e) Check if the back door lock functions properly.

Main Body (Main Body ECU (Driver Side Junction Block Assembly))





OK:
The back door functions as specified in the normal condition column.

NG -- REPLACE MAIN BODY ECU (DRIVER SIDE JUNCTION BLOCK ASSEMBLY)
OK -- Continue to next step.

2. READ VALUE USING TECHSTREAM
(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 back door lock 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 back door functions 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)
A -- Continue to next step.

3. READ VALUE USING TECHSTREAM
(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 / Main Body / Data List.
(e) Check if the switch functions properly.

Main Body (Main Body ECU (Driver Side Junction Block Assembly))





OK:
The back door opener switch functions as specified in the normal condition column.

NG -- INSPECT BACK DOOR OPENER SWITCH ASSEMBLY
OK -- Continue to next step.

4. INSPECT BACK DOOR LOCK ASSEMBLY
(a) Remove the back door lock assembly Smart Key System (for Start Function).
(b) Apply battery voltage and check the operation of the door lock motor.





OK:





(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:

Latch Switch





Sector Switch





Back Door Courtesy Switch





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

5. CHECK HARNESS AND CONNECTOR (BACK DOOR LOCK ASSEMBLY - 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)
A -- REPAIR OR REPLACE HARNESS OR CONNECTOR
6. INSPECT BACK DOOR OPENER SWITCH ASSEMBLY
(a) Remove the back door opener switch assembly Smart Key System (for Start Function).
(b) Measure the resistance according to the value(s) in the table below.





Standard Resistance:






NG -- REPLACE BACK DOOR OPENER SWITCH ASSEMBLY
OK -- Continue to next step.

7. CHECK HARNESS AND CONNECTOR (BACK DOOR OPENER SWITCH ASSEMBLY - MAIN BODY ECU)
(a) Disconnect the R13 back door opener switch assembly connector and D49 main body ECU connector.




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





Text in Illustration





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE MAIN BODY ECU (DRIVER SIDE JUNCTION BLOCK ASSEMBLY)
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