Toyota Yaris: Wiper And Washer System / Terminals Of Ecu

Toyota Yaris XP210 (2020-2025) Reapir and Service Manual / Vehicle Exterior / Wiper / Washer / Wiper And Washer 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.

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

Terminal No. (Symbol)	Terminal Description	Condition	Specified Condition
MB-26 (BCEU) - Body ground	Auxiliary battery power supply	Ignition switch off	11 to 14 V
MB-27 (IGR) - Body ground	IG power source	Ignition switch off	Below 1 V
MB-27 (IGR) - Body ground	IG power source	Ignition switch ON	11 to 14 V
MB-13 (GND1) - Body ground	Ground	Always	Below 1 Ω

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

Terminal No. (Symbol)	Terminal Description	Condition	Specified Condition
4D-5 - Body ground	CXPI communication line	Ignition switch ON	Pulse generation
H4-6 (WPS) - Body ground	Wiper Relay operation signal	Less than approximately 60 seconds after ignition switch turned off	11 to 14 V
H4-6 (WPS) - Body ground	Wiper Relay operation signal	Approximately 60 seconds or more after ignition switch turned off	Below 1 V
H5-11 (LIN4) - Body ground	LIN communication line	Ignition switch ON	Pulse generation

CHECK WINDSHIELD WIPER RELAY ASSEMBLY

(a) Disconnect the A50 and A49 windshield wiper relay assembly connectors.

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

Terminal No. (Symbol)	Terminal Description	Condition	Specified Condition
A50-3 (E) - Body ground	Ground	Always	Below 1 Ω
A50-5 (EWS) - Body ground	Ground	Always	Below 1 Ω
A50-6 (IGWS) - Body ground	Washer circuit IG power source	Ignition switch off	Below 1 V
A50-6 (IGWS) - Body ground	Washer circuit IG power source	Ignition switch ON	11 to 14 V
A50-8 (+B) - Body ground	Ignition switch ON signal (Power source circuit)	Ignition switch ON	11 to 14 V
		Less than approximately 60 seconds after ignition switch turned off	11 to 14 V
		Approximately 60 seconds or more after ignition switch turned off	Below 1 V
A49-5 (ES) - Body ground	Ground	Always	Below 1 Ω

(d) 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
A50-1 (+WR) - Body ground	Front washer operation signal	Ignition switch ON, front washer operating	11 to 14 V
A50-2 (+1) - Body ground	LO operation signal to windshield wiper motor assembly	Ignition switch ON, windshield wiper motor assembly operating in LO	11 to 14 V
A50-4 (+2) - Body ground	HI operation signal to windshield wiper motor assembly	Ignition switch ON, windshield wiper motor assembly operating in HI	11 to 14 V
A49-3 (2S) - Body ground	Windshield wiper motor assembly HI operation signal	Windshield wiper motor assembly stopped	4.5 to 5.5 V
A49-3 (2S) - Body ground	Windshield wiper motor assembly HI operation signal	Windshield wiper motor assembly operating in HI	Below 1 V
A49-4 (MPX1) - Body ground	CXPI communication line	Ignition switch ON	Pulse generation
		Less than approximately 100 seconds after ignition switch turned off	Pulse generation
		Approximately 100 seconds or more after ignition switch turned off	11 to 14 V
A49-6 (+SM) - Body ground	Windshield wiper motor assembly position detection signal	Windshield wiper motor assembly in LO or HI operation	Below 1 V ←→ 11 to 14V
A49-6 (+SM) - Body ground	Windshield wiper motor assembly position detection signal	Windshield wiper motor assembly stopped	Below 1 V

CHECK RAIN SENSOR

(a) Disconnect the V9 rain sensor connector.

(b) 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
V9-2 (ES) - Body ground	Ground	Always	Below 1 Ω
V9-3 (MPX) - Body ground	LIN communication signal	Ignition switch ON	Pulse generation
V9-4 (SIG) - Body ground	IG power source circuit	Ignition switch off	Below 1 V
V9-4 (SIG) - Body ground	IG power source circuit	Ignition switch ON	11 to 14 V

Problem Symptoms Table

PROBLEM SYMPTOMS TABLE NOTICE: If the main body ECU (multiplex network body ECU) is replaced, refer to the Registration. Click here HINT: Use the table below to help determine the cause of problem symptoms...

Dtc Check / Clear

D..

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