Toyota Yaris: Power Door Lock Control System / All Doors LOCK/UNLOCK Functions do not Operate Via Door Key Cylinder

Toyota Yaris XP210 (2020-2022) Reapir and Service Manual / Vehicle Interior / Door Lock / Power Door Lock Control System / All Doors LOCK/UNLOCK Functions do not Operate Via Door Key Cylinder

DESCRIPTION

The main body ECU (multiplex network body ECU) receives door key cylinder lock or unlock switch signals from the front door lock with motor assembly LH. The main body ECU (multiplex network body ECU) activates the door lock motor on each door according to these signals.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

If the main body ECU (multiplex network body ECU) is replaced, refer to the Registration.

Click here

PROCEDURE

1.

READ VALUE USING GTS (Door Lock Switch Status by a Mechanical Key (D/P Door), Door Unlock Switch Status by a Mechanical Key (D Door))

(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

Door Lock Switch Status by a Mechanical Key (D/P Door)

Driver door key-linked switch lock signal

OFF or ON

OFF: Driver door key cylinder not turned to lock position

ON: Driver door key cylinder turned to lock position

-

Door Unlock Switch Status by a Mechanical Key (D Door)

Driver door key-linked switch unlock signal

OFF or ON

OFF: Driver door key cylinder not turned to unlock position

ON: Driver door key cylinder turned to unlock position

-

Body Electrical > Main Body > Data List

Tester Display

Door Lock Switch Status by a Mechanical Key (D/P Door)

Door Unlock Switch Status by a Mechanical Key (D Door)

OK:

On the GTS screen, ON or OFF is displayed for each item according to the table above.

OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

NG

2.

INSPECT FRONT DOOR LOCK WITH MOTOR ASSEMBLY LH

Click here

NG

REPLACE FRONT DOOR LOCK WITH MOTOR ASSEMBLY LH

OK

3.

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

(a) Disconnect the L11 front door lock with motor assembly LH connector.

(b) Disconnect the H4 main body ECU (multiplex network body ECU) connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

L11-9 (L) - H4-28 (L2)

Always

Below 1 Ω

L11-10 (UL) - H4-4 (UL3)

Always

Below 1 Ω

L11-7 (E) - Body ground

Always

Below 1 Ω

L11-9 (L) or H4-28 (L2) - Other terminals and body ground

Always

10 kΩ or higher

L11-10 (UL) or H4-4 (UL3) - Other terminals and body ground

Always

10 kΩ or higher

OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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