Air Conditioning System (For Automatic Air Conditioning System) Blower Motor Circuit

Vehicle Interior. Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25
Heating Air Conditioning. Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

INSPECT BLOWER WITH FAN MOTOR SUB-ASSEMBLY

CHECK HARNESS AND CONNECTOR (BLOWER MOTOR CONTROL - AIR CONDITIONING AMPLIFIER AND BODY GROUND)

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

CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY

AIR CONDITIONING SYSTEM (for Automatic Air Conditioning System) - Blower Motor Circuit


DESCRIPTION

Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25.Heating Air Conditioning.Air Conditioning System (For Automatic Air Conditioning System).Air Conditioning System (For Automatic Air Conditioning System) Blower Motor Circuit
The blower with fan motor sub-assembly is operated by signals from the air conditioning amplifier. Blower with fan motor sub-assembly speed signals are determined by changes in the duty ratio*.
The blower motor control controls the blower with fan motor sub-assembly speed. The blower motor control reads the signal from the air conditioning amplifier assembly and controls rotation and speed.
HINT:
*: The duty ratio is the ratio of the blower with fan motor sub-assembly on time (A) to the total of the blower with fan motor sub-assembly on and off time (A + B).

WIRING DIAGRAM


Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25.Heating Air Conditioning.Air Conditioning System (For Automatic Air Conditioning System).Air Conditioning System (For Automatic Air Conditioning System) Blower Motor Circuit


INSPECTION PROCEDURE

NOTICE:
Inspect the relays for circuits related to this system before performing the following inspection procedure.
1.INSPECT BLOWER WITH FAN MOTOR SUB-ASSEMBLY


    Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25

  1. Remove the blower with fan motor sub-assembly (HILUX_TGN26 RM0000012JK00XX.html).

  1. Apply battery voltage to the blower with fan motor sub-assembly and check the operation of the blower motor.

    OK:
    Measurement Condition
    		Specified Condition
    Battery positive (+) → Terminal 2
    Battery negative (-) → Terminal 1
    		The blower motor operates smoothly


NG
REPLACE BLOWER WITH FAN MOTOR SUB-ASSEMBLY (HILUX_TGN26 RM0000012JK00XX.html)
OK


2.CHECK HARNESS AND CONNECTOR (BLOWER MOTOR CONTROL - AIR CONDITIONING AMPLIFIER AND BODY GROUND)

  1. Disconnect the G78 blower motor control connector.

  1. Disconnect the G94 air conditioning amplifier assembly connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    G78-3 (SI) - G94-2 (BLW)
    		Always
    		Below 1 Ω
    G78-4 (GND) - Body ground
    G78-3 (SI) - Body ground
    		Always
    		10 kΩ or higher
    G78-2 (+B) - Body ground
    G78-1 (VM) - Body ground


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


3.CHECK HARNESS AND CONNECTOR (BLOWER MOTOR CONTROL - BLOWER WITH FAN MOTOR AND BATTERY)

  1. Disconnect the G78 blower motor control connector.

  1. Disconnect the G15 blower with fan motor sub-assembly connector.

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    G78-2 (+B) - Body ground
    1. Ignition switch ON
    2. Blower switch on (LO level)
    		11 to 14 V
    1. Ignition switch ON
    2. Blower switch off
    		Below 1 V
    G15-2 - Body ground
    1. Ignition switch ON
    2. Blower switch on (LO level)
    		11 to 14 V
    1. Ignition switch ON
    2. Blower switch off
    		Below 1 V

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    G15-1 - Body ground
    		Always
    		10 kΩ or higher
    G15-2 - Body ground
    G78-1 (VM) - G15-1
    		Always
    		Below 1 Ω


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


4.CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY


    Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25.Heating Air Conditioning.Air Conditioning System (For Automatic Air Conditioning System).Air Conditioning System (For Automatic Air Conditioning System) Blower Motor Circuit

  1. Remove the air conditioning amplifier assembly with its connectors still connected (HILUX_TGN26 RM000001K3A01QX.html).

  1. Using an oscilloscope, check the waveform of the amplifier.

    Measurement Condition
    Item
    		Content
    Tester Connection
    		G94-2 (BLW) - Body ground
    Tool Setting
    		1 V/DIV., 50 μsec./DIV.
    Condition
    		Ignition switch ON, Blower switch on (LO level)
    OK:
    Waveform is as shown in the illustration.
    HINT:
    Waveform varies depending on the blower switch setting.
    Text in Illustration
    *a
    		Component with harness connected
    (Air Conditioning Amplifier Assembly)


NG
REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY (HILUX_TGN26 RM000001K3A01QX.html)
OK

REPLACE BLOWER MOTOR CONTROL (HILUX_TGN26 RM0000012JL01EX.html)