Toyota Yaris: Lighting System / Terminals Of Ecu

Toyota Yaris XP210 (2020-2024) Reapir and Service Manual / Vehicle Interior / Lighting (int) / Lighting System / Terminals Of Ecu

TERMINALS OF ECU

CHECK MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) AND POWER DISTRIBUTION BOX ASSEMBLY

*1

Power Distribution Box Assembly

*2

Main Body ECU (Multiplex Network Body ECU)

(a) Remove the main body ECU (multiplex network body ECU) from the power distribution box assembly.

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(b) Connect the power distribution box assembly connectors.

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

Terminal No. (Symbol)

Terminal Description

Condition

Specified Condition

MB-13 (GND1) - Body ground

Ground

Always

Below 1 Ω

MB-14 (GND2) - Body ground

Ground

Always

Below 1 Ω

MB-26 (BECU) - Body ground

Auxiliary battery power supply

Ignition switch off

11 to 14 V

MB-27 (IGR) - Body ground

Ignition power supply

Ignition switch off

Below 1 V

Ignition switch ON

11 to 14 V

(d) Install the main body ECU (multiplex network body ECU).

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(e) Connect the power distribution box assembly and main body ECU (multiplex network body ECU) connectors.

(f) Measure the voltage and check for pulses according to the value(s) in the table below.

Terminal No. (Symbol)

Terminal Description

Condition

Specified Condition

4F-1 - Body ground

DOME CUT relay drive power supply

Ignition switch off

11 to 14 V

4E-3 - Body ground

Front door courtesy light switch (LH) signal

Front door LH open

Below 1 V

Front door LH closed

4.7 to 5.3 V

4E-5 - Body ground

Front door courtesy light switch (RH) signal

Front door RH open

Below 1 V

Front door RH closed

4.7 to 5.3 V

4C-1 - Body ground

Each instrument panel illumination power supply

Light control switch in neither tail nor head position

Below 1 V

Light control switch in tail or head position

11 to 14 V

4C-4 - Body ground

Interior light power supply

DOME CUT relay off

11 to 14 V

DOME CUT relay on

Below 1 V

H4-5 (ILE) - Body ground

Illuminated entry system drive output

Illuminated entry system inactive

11 to 14 V

Illuminated entry system operation

Below 1 V

4E-9 - Body ground

Multiplex network master switch assembly illumination light power supply

Multiplex network master switch assembly illumination light off

Below 1 V

Multiplex network master switch assembly illumination light on

11 to 14 V

4E-2 - Body ground

Back door courtesy light switch signal

Back door locked

Pulse generation

Back door unlocked

Below 1 V

H4-9 (LSFL) - Body ground

Front door LH unlock detection switch input

Front door LH locked

Pulse generation

Front door LH unlocked

Below 1 V

H4-3 (LSFR) - Body ground

Front door RH unlock detection switch input

Front door RH locked

Pulse generation

Front door RH unlocked

Below 1 V

NOTICE:

*: If the low beam headlights or clearance lights illuminate when the ignition switch is turned ON, shine a light on the automatic light control sensor to turn the low beam headlights off before operating the headlight dimmer switch.

CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

(a) Measure the voltage according to the value(s) in the table below.

Terminal No. (Symbol)

Terminal Description

Condition

Specified Condition

H46-20 (SWIL) - H46-30 (AGND)

Push start switch illumination drive output

Push start switch illumination off

Below 1 V

Push start switch illumination on

11 to 14 V

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