Toyota Yaris: Air Conditioning System / Blower Motor Circuit

Toyota Yaris XP210 (2020-2024) Reapir and Service Manual / Vehicle Interior / Heating / Air Conditioning / Air Conditioning System / Blower Motor Circuit

DESCRIPTION

The blower motor with fan sub-assembly is operated by signals from the air conditioning amplifier assembly. Blower motor speed signals are transmitted in accordance with changes in the duty ratio.

If the airflow volume is low or the blower speed cannot be changed, the following factors may be the cause.

Symptom

Factor

Airflow volume cannot be changed

  • Air conditioning amplifier assembly malfunction
  • Blower motor with fan sub-assembly malfunction
  • Harness or connector

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses for circuits related to this system before performing the following procedure.

PROCEDURE

1.

PERFORM ACTIVE TEST USING GTS (BLOWER LEVEL)

(a) Perform the Active Test according to the display on the GTS.

Body Electrical > Air Conditioner > Active Test

Tester Display

Measurement Item

Control Range

Diagnostic Note

Blower Level

Blower motor with fan sub-assembly

Min.: 0

Max.: 31

-

Body Electrical > Air Conditioner > Active Test

Tester Display

Blower Level

Result

Proceed to

Blower motor with fan sub-assembly does not operate

A

Blower motor with fan sub-assembly operates but does not change speed

B

B

GO TO STEP 7

A

2.

CHECK HARNESS AND CONNECTOR (BLOWER MOTOR WITH FAN SUB-ASSEMBLY - POWER SOURCE)

(a) Disconnect the blower motor with fan sub-assembly connector.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

H28-3 (+B) - Body ground

Always

11 to 14 V

*a

Front view of wire harness connector

(to Blower Motor with Fan Sub-assembly)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

3.

CHECK HARNESS AND CONNECTOR (BLOWER MOTOR WITH FAN SUB-ASSEMBLY - BODY GROUND)

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

H28-1 (GND) - Body ground

Always

Below 1 Ω

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

4.

CHECK HARNESS AND CONNECTOR (BLOWER MOTOR WITH FAN SUB-ASSEMBLY - AIR CONDITIONING AMPLIFIER ASSEMBLY)

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

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

H28-2 (SI) - H24-21 (BLW)

Always

Below 1 Ω

H28-2 (SI) or H24-21 (BLW) - Other terminals and body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

5.

INSPECT BLOWER MOTOR WITH FAN SUB-ASSEMBLY

(a) Connect the H28 blower motor with fan sub-assembly connector.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

H24-21 (BLW) - Body ground

Always

4.75 to 5.25 V

*a

Front view of wire harness connector

(to Air Conditioning Amplifier Assembly)

NG

REPLACE BLOWER MOTOR WITH FAN SUB-ASSEMBLY

OK

6.

INSPECT AIR CONDITIONING AMPLIFIER ASSEMBLY

*a

Component with harness connected

(Air Conditioning Amplifier Assembly)

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

(b) Using an oscilloscope, check the waveform.

Item

Content

Terminal No.

H24-21 (BLW) - H24-17 (GND)

Tool Setting

2 V/DIV., 1 ms./DIV.

Condition

  • Ignition switch ON
  • Blower speed: LO

OK:

Waveform is similar to that shown in the illustration.

HINT:

The waveform varies with the blower speed.

OK

REPLACE BLOWER MOTOR WITH FAN SUB-ASSEMBLY

NG

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

7.

INSPECT AIR CONDITIONING AMPLIFIER ASSEMBLY

*a

Component with harness connected

(Air Conditioning Amplifier Assembly)

(a) Using an oscilloscope, check the waveform.

Item

Content

Terminal No.

H24-21 (BLW) - H24-17 (GND)

Tool Setting

2 V/DIV., 1 ms./DIV.

Condition

  • Ignition switch ON
  • Blower speed: LO

OK:

Waveform is similar to that shown in the illustration.

HINT:

The waveform varies with the blower speed.

OK

REPLACE BLOWER MOTOR WITH FAN SUB-ASSEMBLY

NG

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

    Lost Communication with ECM/PCM "A" Missing Message (U010087,U013187,U014087,U015587,U016387)

    DESCRIPTION These DTCs are stored when the CAN communication system is malfunctioning. DTC No. Detection Item DTC Detection Condition Trouble Area Memory U010087 Lost Communication with ECM/PCM "A" Missing Message Diagnosis Condition: IG voltage 8...

    Ambient Temperature Display System

    DESCRIPTION The thermistor assembly is installed in front of the cooler condenser assembly to detect the ambient temperature, which is used to control the automatic air conditioning system...

    Other information:

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


    INSTALLATION CAUTION / NOTICE / HINT NOTICE: This procedure includes the installation of small-head bolts. Refer to Small-Head Bolts of Basic Repair Hint to identify the small-head bolts. Click here PROCEDURE 1. INSTALL CYLINDER HEAD GASKET (a) Clean the cylinder block sub-assembly and cylinder head sub-assembly with solvent...

    Toyota Yaris XP210 (2020-2024) Reapir and Service Manual: SRS Warning Light Remains ON


    DESCRIPTION The SRS warning light is located in the combination meter assembly. When the SRS is normal, the SRS warning light comes on for approximately 6 seconds after the ignition switch is turned from off to ON, and then turns off automatically. If there is a malfunction in the SRS, the SRS warning light comes on to inform the driver of a problem...

    Categories

    Liftgate/Trunk Lid

    WARNING

    Never allow a person to ride in the luggage compartment/trunk

    Allowing a person to ride in the luggage compartment/trunk is dangerous. The person in the luggage compartment/trunk could be seriously injured or killed during sudden braking or a collision.

    Do not drive with the liftgate/trunk lid open

    read more

     
    Copyright © 2024 www.toyaris4.com