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


DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

ACTUATOR CHECK

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

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

INSPECT BLOWER WITH FAN MOTOR SUB-ASSEMBLY

CHECK HARNESS AND CONNECTOR (BLOWER MOTOR CONTROL - BLOWER WITH FAN MOTOR AND DRIVER SIDE JUNCTION BLOCK)

CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY

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


DESCRIPTION

Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.Air Conditioning.Air Conditioning System (For Automatic Air Conditioning System).Air Conditioning System (For Automatic Air Conditioning System) Blower Motor Circuit
The blower motor is operated by signals from the air conditioning amplifier. Blower motor speed signals are determined by changes in the duty ratio*.
The blower motor control controls the blower motor speed. The blower motor control reads the signal from the air conditioning amplifier and controls rotation and speed.
HINT:
*: The duty ratio is the ratio of the blower motor ON time (A) to the total of the blower motor ON and OFF time (A + B).

WIRING DIAGRAM


Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.Air Conditioning.Air Conditioning System (For Automatic Air Conditioning System).Air Conditioning System (For Automatic Air Conditioning System) Blower Motor Circuit


INSPECTION PROCEDURE

1.ACTUATOR CHECK

  1. Enter actuator check mode (Toyota Fortuner RM000003PQ3001X.html).

  1. Press the front DEF switch to change to the step operation (Toyota Fortuner RM000003PQ1001X.html).

  1. Check the air flow level by hand.

    Display Code
    		Blower Level
    0
    		0
    1
    		1
    2
    		16
    3
    		16
    4
    		16
    5
    		16
    6
    		16
    7
    		16
    8
    		16
    9
    		31
    OK:
    Blower level changes in accordance with each display code.


NG
Go to step 2
OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE (Toyota Fortuner RM000003S6F002X.html)

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


    Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.Air Conditioning.Air Conditioning System (For Automatic Air Conditioning System).Air Conditioning System (For Automatic Air Conditioning System) Blower Motor Circuit

  1. Disconnect the B6 control connector.

  1. Disconnect the A16 amplifier connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    B6-3 (SI) - A16-2 (BLW)
    		Always
    		Below 1 Ω
    B6-3 (SI) - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


3.CHECK HARNESS AND CONNECTOR (BLOWER MOTOR CONTROL - BODY GROUND)


    Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.Air Conditioning.Air Conditioning System (For Automatic Air Conditioning System).Air Conditioning System (For Automatic Air Conditioning System) Blower Motor Circuit

  1. Disconnect the B6 control connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    B6-4 (GND) - Body ground
    		Always
    		Below 1 Ω


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


4.INSPECT BLOWER WITH FAN MOTOR SUB-ASSEMBLY


    Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.Air Conditioning.Air Conditioning System (For Automatic Air Conditioning System).Air Conditioning System (For Automatic Air Conditioning System) Blower Motor Circuit

  1. Remove the motor.

  1. Apply battery voltage to the motor and check that the motor rotates smoothly.

    OK:
    Measurement Condition
    		Specified Condition
    Battery positive (+) → Terminal 2
    Battery negative (-) → Terminal 1
    		Motor rotates counterclockwise


NG
REPLACE BLOWER WITH FAN MOTOR SUB-ASSEMBLY (Toyota Fortuner RM0000012JL002X.html)
OK


5.CHECK HARNESS AND CONNECTOR (BLOWER MOTOR CONTROL - BLOWER WITH FAN MOTOR AND DRIVER SIDE JUNCTION BLOCK)


    Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.Air Conditioning.Air Conditioning System (For Automatic Air Conditioning System).Air Conditioning System (For Automatic Air Conditioning System) Blower Motor Circuit

  1. Disconnect the B6 control connector.

  1. Disconnect the B5 motor connector.

  1. Disconnect the 2A junction block connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    B6-1 (VM) - B5-1
    		Always
    		Below 1 Ω
    B6-2 (+B) - 2A-3
    B5-2 - 2A-5
    B6-2 (+B) - Body ground
    		Always
    		10 kΩ or higher
    B5-1 - Body ground
    B5-2 - Body ground


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


6.CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY


    Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.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 with its connectors still connected.

  1. Turn the ignition switch to ON.

  1. Turn the blower switch ON (LO).

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

    Measurement Condition
    Item
    		Content
    Tester Connection
    		A16-2 (BLW) - A16-1 (GND)
    Tool Setting
    		1 V/DIV., 50 μsec./DIV.
    Condition
    		Blower switch ON (LO)
    OK:
    Waveform is as shown in the illustration.
    HINT:
    Waveform varies depending on the blower switch setting.


NG
REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY (Toyota Fortuner RM0000012KH002X.html)
OK

REPLACE BLOWER MOTOR CONTROL (Toyota Fortuner RM0000012JL002X.html)