Toyota Yaris: Lighting System / Terminals Of Ecu

Toyota Yaris XP210 (2020-2023) Reapir and Service Manual / Vehicle Exterior / Lighting (ext) / Lighting System / Terminals Of Ecu

TERMINALS OF ECU

*1

Power Distribution Box Assembly

*2

Main Body ECU (Multiplex Network Body ECU)

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

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

Click here

(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 Ω

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 resistance, and check for pulses according to the value(s) in the table below.

Terminal No. (Symbol)

Terminal Description

Condition

Specified Condition

H4-26 (HEAD) - Body ground

Light control switch in HEAD position signal input

Light control switch not in HEAD position

11 to 14 V

Light control switch in HEAD position

Below 1 V

4D-10 - Body ground

Headlight assembly LH power supply

Ignition switch off

11 to 14 V

Ignition switch ON

Below 1 V

4D-6 - Body ground

Headlight assembly RH power supply

Ignition switch off

11 to 14 V

Ignition switch ON

Below 1 V

H4-8 (CLTB) - H4-21 (CLTE)

Automatic light control sensor power supply output

Ignition switch off

Below 1 V

Ignition switch ON

11 to 14 V

H4-14 (AHBI) - Body ground

Auto high beam switch signal input

Auto high beam switch on

Below 1 V

Auto high beam switch off

11 to 14 V

H4-20 (CLTS) - Body ground

Automatic light control sensor signal input

Ignition switch ON

Pulse generation

(See waveform 1)

4E-5 - Body ground

Front door courtesy light switch assembly RH input

Front door RH open

4.7 to 5.3 V

Front door RH closed

Below 1 V

(1) Waveform 1

Item

Content

Tester Connection

H4-20 (CLTS) - Body ground

Tool setting

2 V/DIV., 10 ms./DIV.

Condition

Ignition switch ON

HINT:

The communication waveform changes according to the surrounding brightness.

CHECK COMBINATION METER ASSEMBLY

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CHECK STEERING SENSOR

Click here

CHECK FORWARD RECOGNITION CAMERA (w/ Toyota Safety Sense)

Click here

SEMICONDUCTOR POWER INTEGRATION ECU

Click here

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