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

Power Distribution Box Assembly

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.

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
MB-27 (IGR) - Body ground	Ignition power supply	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
4E-3 - Body ground	Front door courtesy light switch (LH) signal	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
4E-5 - Body ground	Front door courtesy light switch (RH) signal	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
4C-1 - Body ground	Each instrument panel illumination power supply	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
4C-4 - Body ground	Interior light power supply	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
H4-5 (ILE) - Body ground	Illuminated entry system drive output	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
4E-9 - Body ground		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
4E-2 - Body ground	Back door courtesy light switch signal	Back door unlocked	Below 1 V
H4-9 (LSFL) - Body ground	Front door LH unlock detection switch input	Front door LH locked	Pulse generation
H4-9 (LSFL) - Body ground	Front door LH unlock detection switch input	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
H4-3 (LSFR) - Body ground	Front door RH unlock detection switch input	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
H46-20 (SWIL) - H46-30 (AGND)	Push start switch illumination drive output	Push start switch illumination on	11 to 14 V

Problem Symptoms Table

PROBLEM SYMPTOMS TABLE NOTICE: Before replacing the main body ECU (multiplex network body ECU) or certification ECU (smart key ECU assembly), refer to Registration...

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Toyota Yaris XP210 (2020-2024) Reapir and Service Manual: Disassembly

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