Toyota Yaris: Window Defogger System / Terminals Of Ecu

Toyota Yaris XP210 (2020-2025) Reapir and Service Manual / Vehicle Exterior / Window / Glass / Window Defogger System / Terminals Of Ecu

TERMINALS OF ECU

CHECK MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) AND INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

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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-26 (BECU) - Body ground	Auxiliary battery power supply	Ignition switch off	11 to 14 V
MB-27 (IGR) - Body ground	Ignition power supply (IG signal)	Ignition switch off → ON	Below 1 V → 11 to 14 V
MB-13 (GND1) - Body ground	Ground	Always	Below 1 Ω

(d) Install to the power distribution box assembly the main body ECU (multiplex network body ECU).

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

Terminal No. (Symbol)	Terminal Description	Condition	Specified Condition
4E-43 - Body ground	Rear window defogger signal (output)	Rear window defogger switch off	Below 1 V
4E-43 - Body ground	Rear window defogger signal (output)	Rear window defogger switch on	11 to 14 V

AIR CONDITIONING AMPLIFIER ASSEMBLY

(a) Disconnect the H24 air conditioning amplifier assembly connector.

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

Terminal No. (Symbol)	Terminal Description	Condition	Specified Condition
H24-5 (B) - H24-17 (GND)	Power source	Ignition switch off	11 to 14 V
H24-6 (IG+) - H24-17 (GND)	Power source (IG)	Ignition switch off	Below 1 V
H24-6 (IG+) - H24-17 (GND)	Power source (IG)	Ignition switch ON	11 to 14 V
H24-17 (GND) - Body ground	Ground	Always	Below 1 Ω

(d) Measure the pulses according to the value(s) in the table below.

Terminal No. (Symbol)	Terminal Description	Condition	Specified Condition
H24-1 (CANL) - Body ground	CAN communication line	Ignition switch ON	Pulse generation
H24-2 (CANH) - Body ground	CAN communication line	Ignition switch ON	Pulse generation
H24-7 (LIN1) - Body ground	LIN communication line	Ignition switch ON	Pulse generation

Problem Symptoms Table

PROBLEM SYMPTOMS TABLE HINT: Inspect the fuses and relays related to this system before inspecting the suspected areas below. Use the table below to help determine the cause of problem symptoms...

Diagnosis System

DIAGNOSIS SYSTEM CHECK DLC3 (a) Check the DLC3. Click here INSPECT AUXILIARY BATTERY VOLTAGE (a) Measure the auxiliary battery voltage with ignition switch off...

Other information:

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