Toyota Corolla Cross: Door Unlock Detection Switch Circuit

Toyota Corolla Cross (2022-2026) Service Manual / Vehicle Interior / Lighting (int) / Lighting System / Door Unlock Detection Switch Circuit

DESCRIPTION

The main body ECU (multiplex network body ECU) detects the condition of each door unlock detection switch.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Before replacing the main body ECU (multiplex network body ECU), refer to Registration.*1

for HEV Model: Click here

for Gasoline Model: Click here

*1: w/ Smart Key System

PROCEDURE

1.	READ VALUE USING GTS

(a) Read the Data List according to the display on the GTS.

Body Electrical > Main Body > Data List

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
FR Door Lock Position Switch Status	Front door RH unlock detection switch signal	LOCK or UNLOCK	LOCK: Front door RH locked UNLOCK: Front door RH unlocked	-
FL Door Lock Position Switch Status	Front door LH unlock detection switch signal	LOCK or UNLOCK	LOCK: Front door LH locked UNLOCK: Front door LH unlocked	-
RR Door Lock Position Switch Status	Rear door RH unlock detection switch signal	LOCK or UNLOCK	LOCK: Rear door RH locked UNLOCK: Rear door RH unlocked	-
RL Door Lock Position Switch Status	Rear door LH unlock detection switch signal	LOCK or UNLOCK	LOCK: Rear door LH locked UNLOCK: Rear door LH unlocked	-

Body Electrical > Main Body > Data List

Tester Display
FR Door Lock Position Switch Status
FL Door Lock Position Switch Status
RR Door Lock Position Switch Status
RL Door Lock Position Switch Status

OK:

Normal conditions listed above are displayed.

Result	Proceed to
OK	A
NG ("FR Door Lock Position Switch Status" is not normal)	B
NG ("FL Door Lock Position Switch Status" is not normal)	C
NG ("RR Door Lock Position Switch Status" is not normal)	D
NG ("RL Door Lock Position Switch Status" is not normal)	E

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

GO TO STEP 4

GO TO STEP 6

GO TO STEP 8

2.	INSPECT FRONT DOOR LOCK ASSEMBLY RH

Click here

REPLACE FRONT DOOR LOCK ASSEMBLY RH

3.	CHECK HARNESS AND CONNECTOR (FRONT DOOR LOCK ASSEMBLY RH - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) AND BODY GROUND)

(a) Disconnect the I85 main body ECU (multiplex network body ECU) connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
K5-7 (LSSR) - I85-3 (LSFR)	Always	Below 1 Ω
K5-8 (E) - Body ground	Always	Below 1 Ω
K5-7 (LSSR) - Body ground	Always	10 kΩ or higher
I85-3 (LSFR) - Body ground	Always	10 kΩ or higher

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.	INSPECT FRONT DOOR LOCK ASSEMBLY LH

Click here

REPLACE FRONT DOOR LOCK ASSEMBLY LH

5.	CHECK HARNESS AND CONNECTOR (FRONT DOOR LOCK ASSEMBLY LH - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) AND BODY GROUND)

(a) Disconnect the I85 main body ECU (multiplex network body ECU) connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
L4-8 (LSSR) - I85-9 (LSFL)	Always	Below 1 Ω
L4-7 (E) - Body ground	Always	Below 1 Ω
L4-8 (LSSR) - Body ground	Always	10 kΩ or higher
I85-9 (LSFL) - Body ground	Always	10 kΩ or higher

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

REPAIR OR REPLACE HARNESS OR CONNECTOR

6.	INSPECT REAR DOOR LOCK ASSEMBLY RH

Click here

REPLACE REAR DOOR LOCK ASSEMBLY RH

7.	CHECK HARNESS AND CONNECTOR (REAR DOOR LOCK ASSEMBLY RH - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) AND BODY GROUND)

(a) Disconnect the I86 main body ECU (multiplex network body ECU) connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
M1-6 (LSSR) - I86-23 (LSWR)	Always	Below 1 Ω
M1-9 (E) - Body ground	Always	Below 1 Ω
M1-6 (LSSR) - Body ground	Always	10 kΩ or higher
I86-23 (LSWR) - Body ground	Always	10 kΩ or higher

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

REPAIR OR REPLACE HARNESS OR CONNECTOR

8.	INSPECT REAR DOOR LOCK ASSEMBLY LH

Click here

REPLACE REAR DOOR LOCK ASSEMBLY RH

9.	CHECK HARNESS AND CONNECTOR (REAR DOOR LOCK ASSEMBLY LH - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) AND BODY GROUND)

(a) Disconnect the I85 main body ECU (multiplex network body ECU) connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
N1-6 (LSSR) - I85-10 (LSWL)	Always	Below 1 Ω
N1-9 (E) - Body ground	Always	Below 1 Ω
N1-6 (LSSR) - Body ground	Always	10 kΩ or higher
I85-10 (LSWL) - Body ground	Always	10 kΩ or higher

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

REPAIR OR REPLACE HARNESS OR CONNECTOR

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