Toyota Yaris: Window Defogger System / Terminals Of Ecu

Toyota Yaris XP210 (2020-2024) 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

*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.

Click here

(b) Connect the power distribution box assembly connectors.

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

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).

Click here

(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

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

Ignition switch ON

11 to 14 V

H24-17 (GND) - Body ground

Ground

Always

Below 1 Ω

(c) Connect the H24 air conditioning amplifier assembly connectors.

(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:

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


    REMOVAL CAUTION / NOTICE / HINT HINT: When the cable is disconnected / reconnected to the auxiliary battery terminal, systems temporarily stop operating. However, each system has a function that completes learning the first time the system is used. Learning completes when vehicle is driven Effect/Inoperative Function When Necessary Procedures are not Performed Necessary Procedures Link Lane tracing assist system Drive the vehicle straight ahead at 35 km/h (22 mph) or more for 5 second or more...

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


    GENERAL INFORMATION A large number of ECU controlled systems are used in this vehicle. In general, ECU controlled systems are considered to be very intricate, requiring a high level of technical knowledge to troubleshoot. However, most problem checking procedures only involve inspecting the ECU controlled system circuits one by one...

    Categories

    Refueling

    Before refueling, close all the doors, windows, and the liftgate/trunk lid, and switch the ignition OFF.

    To open the fuel-filler lid, pull the remote fuel-filler lid release.

    Toyota Yaris. Refueling

    To remove the fuel-filler cap, turn it counterclockwise. Attach the removed cap to the inner side of the fuel-filler lid.

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