Toyota Yaris: Window Defogger System / Rear Window Defogger System does not Operate

Toyota Yaris XP210 (2020-2024) Reapir and Service Manual / Vehicle Exterior / Window / Glass / Window Defogger System / Rear Window Defogger System does not Operate

DESCRIPTION

An operation request signal is sent to the air conditioning amplifier assembly via LIN communication when the rear window defogger switch (air conditioning control assembly) is operated. When the air conditioning amplifier assembly receives the signal, it sends an operation request signal via CAN communication to the main body ECU (multiplex network body ECU).When the main body ECU (multiplex network body ECU) receives the signal, it sends an operation request signal via CPXI communication to the power distribution box assembly. After the operation request signal is received by the power distribution box assembly it outputs an operation signal and operates the window defogger.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • Inspect the fuses for circuits related to this system before performing the following procedure.
  • With the negative (-) battery terminal connected, disconnect/do not connect the connector of the power distribution box assembly.
  • When replacing the power distribution box assembly, the system may not operate normally if the same part number is not used.
  • The window defogger system uses the CAN communication system, LIN communication system and CXPI communication system. Inspect the communication function by following How to Proceed with Troubleshooting.

    Troubleshoot the window defogger system after confirming that the communication system is functioning properly.

    Click here

PROCEDURE

1.

READ VALUE USING GTS (REAR DEFOGGER INPUT SIGNAL)

(a) Using the GTS, read the Data List.

Body Electrical > Power Distribution Box > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Rear Defogger Input Signal

Window defogger switch signal input condition

ON or OFF

ON: Rear window defogger switch is on

OFF: Rear window defogger switch is off

-

Body Electrical > Power Distribution Box > Data List

Tester Display

Rear Defogger Input Signal

OK:

The Data List value displays "ON" with the rear window defogger switch set to ON.

NG

GO TO STEP 5

OK

2.

READ VALUE USING GTS (REAR DEFOGGER OUTPUT SIGNAL)

(a) Using the GTS, read the Data List.

Body Electrical > Power Distribution Box > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Rear Defogger Output Signal

Window defogger output condition

ON or OFF

ON: Window defogger operates

OFF: Window defogger does not operate

-

Body Electrical > Power Distribution Box > Data List

Tester Display

Rear Defogger Output Signal

OK:

When the rear window defogger switch is ON, the data monitor standard value is "ON".

NG

REPLACE POWER DISTRIBUTION BOX ASSEMBLY

OK

3.

CHECK HARNESS AND CONNECTOR (POWER DISTRIBUTION BOX ASSEMBLY - REAR WINDOW DEFOGGER WIRE [BACK DOOR GLASS])

(a) Disconnect the 4E power distribution box assembly connector.

(b) Disconnect the X1 rear window defogger wire (back door glass) connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

4E-43 - X1-1 (B)

Always

Below 1 Ω

4E-43 or X1-1 (B) - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

4.

CHECK HARNESS AND CONNECTOR (REAR WINDOW DEFOGGER WIRE [BACK DOOR GLASS] - BODY GROUND)

(a) Disconnect the Y6 rear window defogger wire (back door glass) connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

Y6-1 (E) - Body ground

Always

Below 1 Ω

OK

REPAIR REAR WINDOW DEFOGGER WIRE (BACK DOOR GLASS)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

5.

CHECK AIR CONDITIONING SYSTEM

(a) Check the air conditioning system.

Click here

HINT:

Both the window defogger system operation signal and air conditioning system operation signal are transmitted to the air conditioning amplifier assembly via the same communication line.

OK:

The air conditioning system operates normally.

NG

GO TO AIR CONDITIONING SYSTEM

OK

6.

CHECK AIR CONDITIONING CONTROL ASSEMBLY

(a) Check that the defogger indicator illuminates when the window defogger switch is on.

OK:

Defogger indicator illuminates.

NG

REPLACE AIR CONDITIONING CONTROL ASSEMBLY

OK

7.

PERFORM ACTIVE TEST USING GTS

(a) Using the GTS, perform the Active Test.

Body Electrical > Air Conditioner > Active Test

Tester Display

Measurement Item

Control Range

Diagnostic Note

Rear Defogger Relay

Rear window defogger wire (Back door glass)

OFF or ON

-

Body Electrical > Air Conditioner > Active Test

Tester Display

Rear Defogger Relay

OK:

Rear window defogger wire (back door glass) warms up.

OK

REPLACE AIR CONDITIONING CONTROL ASSEMBLY

NG

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

    Data List / Active Test

    DATA LIST / ACTIVE TEST DATA LIST (a) Perform the Active Test according to the display on the GTS. Body Electrical > Power Distribution Box > Data List Tester Display Measurement Item Range Normal Condition Diagnostic Note Rear Defogger Input Signal Window defogger switch signal input condition ON or OFF ON: Window defogger switch is on OFF: Window defogger switch is off - Rear Defogger Output Signal Window defogger output condition ON or OFF ON: Window defogger operates OFF: Window defogger does not operate - Rear Defogger Output Current Window defogger current Min...

    Window Defogger Wire

    On-vehicle InspectionON-VEHICLE INSPECTION PROCEDURE 1. INSPECT DEFOGGER WIRE (BACK DOOR GLASS) NOTICE: When cleaning the glass, wipe the glass along the wire using a soft, dry cloth...

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