Toyota CH-R Service Manual: Blower Motor Circuit

Toyota CH-R Service Manual / Heating / Air Conditioning / Air Conditioning System(for Automatic Air Conditioning System With Side-mounted Air Conditioner Pressure Sensor) / 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.

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 TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / Air Conditioner / Active Test.

(e) Perform the Active Test according to the display on the Techstream.

Body Electrical > Air Conditioner > Active Test

Tester Display

Measurement Item

Control Range

Diagnostic Note

Blower Motor

Blower motor with fan sub-assembly

Min.: 0, Max.: 31

-
Body Electrical > Air Conditioner > Active Test

Tester Display

Blower Motor

Result

Proceed to

OK

A

NG (Blower motor with fan sub-assembly does not operate)

B

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

C
A

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

C

GO TO STEP 6

B

2.

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

(a) Disconnect the A85 blower motor with fan sub-assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A85-1 (GND) - Body ground

Always

Below 1 Ω
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

3.

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

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

A85-3 (+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

4.

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

(a) Disconnect the F139 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

F139-6 (BLW) - A85-2 (SI)

Always

Below 1 Ω

F139-6 (BLW) or A85-2 (SI) - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

5.

INSPECT BLOWER MOTOR WITH FAN SUB-ASSEMBLY

(a) Reconnect the A85 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

F139-6 (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) Reconnect the F139 air conditioning amplifier assembly connector.

(b) Turn the ignition switch ON.

(c) Turn the blower switch on (LO).

(d) Connect an oscilloscope to terminals F139-6 (BLW) and F139-4 (GND) of the air conditioning amplifier assembly and check the waveform.

OK:

Waveform is similar to that shown in the illustration.

HINT:

The waveform varies with the blower speed.

Item

Content

Tool Setting

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

Vehicle Condition
  • Ignition switch ON
  • Blower switch: Lo

*a

Component with harness connected

(Air Conditioning Amplifier Assembly)
OK

REPLACE BLOWER MOTOR WITH FAN SUB-ASSEMBLY

NG

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

    Ambient Temperature Sensor Circuit (B1412)
    DESCRIPTION The thermistor assembly is installed in front of the cooler condenser assembly to detect the ambient temperature, which is used to control the air conditioning system. This sensor is ...

    PTC Heater Circuit
    DESCRIPTION The air conditioning amplifier assembly sends operation signals to the PTC heater relays when quick heater assembly operation conditions are met. Based on the signals from the air con ...

    Other materials:

    Toyota CH-R Owners Manual > Dynamic radar cruise control with full-speed range: Setting the vehicle speed (vehicle-to-vehicle distance control mode)
    1. Press the "ON-OFF" button to activate the cruise control. Radar cruise control indicator will come on and a message will be displayed on the multi-information display. Press the button again to deactivate the cruise control. If the "ON-OFF" button is pressed and held for ...

    Toyota CH-R Owners Manual > Adjusting the steering wheel and mirrors: Inside rear view mirror
    The rear view mirror's position can be adjusted to enable sufficient confirmation of the rear view. Adjusting the height of rear view mirror The height of the rear view mirror can be adjusted to suit your driving posture. Adjust the height of the rear view mirror by moving it up and down. ...

    Toyota C-HR (AX20) 2023-2026 Owner's Manual

    Toyota CH-R Owners Manual

    Toyota CH-R Service Manual

    © 2017-2026 Copyright www.tochr.net
    0.0068