Toyota Corolla Cross: Back Door Closer Switch General Electrical Failure (B225101)

Toyota Corolla Cross (2022-2024) Service Manual / Vehicle Exterior / Door / Hatch / Power Back Door System / Back Door Closer Switch General Electrical Failure (B225101)

DESCRIPTION

The multiplex network door ECU receives signals from the latch switch, initial switch, pawl switch and back door courtesy switch, which are built into the back door lock assembly. Based on these switch signals, the latch position of the back door lock with courtesy light switch assembly is determined.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area
B225101	Back Door Closer Switch General Electrical Failure	While the back door closer is operating, a malfunction is detected in position information from the back door courtesy switch within a specified amount of time.	Back door lock with courtesy light switch assembly Harness or connector Multiplex network door ECU

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

If the replacement, removal and installation of the multiplex network door ECU or disconnection of the connectors of the multiplex network door ECU has been performed, initialize the power back door system.
Click here
If the main body ECU (multiplex network body ECU) is replaced, refer to Registration.
for HEV Model: Click here

for Gasoline Model: Click here

PROCEDURE

1.	READ VALUE USING GTS

(a) 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 Switch	Back door courtesy switch signal	ON or OFF	OFF: Back door closed	-

Body Electrical > Back Door > Data List

Tester Display
Courtesy Switch

Result	Proceed to
The value of Courtesy Switch is OFF	A
None of the above conditions are met	B

GO TO STEP 3

2.	READ VALUE USING GTS

(a) 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 Switch	Back door courtesy switch signal	ON or OFF	ON: Back door open	-

Body Electrical > Back Door > Data List

Tester Display
Courtesy Switch

Result	Proceed to
The value of Courtesy Switch is ON	A
None of the above conditions are met	B

REPLACE MULTIPLEX NETWORK DOOR ECU

3.	INSPECT BACK DOOR LOCK WITH COURTESY LIGHT SWITCH ASSEMBLY

Click here

REPLACE BACK DOOR LOCK WITH COURTESY LIGHT SWITCH ASSEMBLY

4.	CHECK HARNESS AND CONNECTOR (BACK DOOR LOCK WITH COURTESY LIGHT SWITCH ASSEMBLY - MULTIPLEX NETWORK DOOR ECU AND BODY GROUND)

(a) Disconnect the U39 multiplex network door ECU connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
U17-4 (CTY) - U39-3 (FUL)	Always	Below 1 Ω
U17-1 (E) - Body ground	Always	Below 1 Ω
U17-4 (CTY) or U39-3 (FUL) - Body ground	Always	10 kΩ or higher

REPLACE MULTIPLEX NETWORK DOOR ECU

REPAIR OR REPLACE HARNESS OR CONNECTOR

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Toyota Corolla Cross: Back Door Closer Switch General Electrical Failure (B225101)

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