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


DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

PERFORM ACTUATOR CHECK

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 AND BLOWER WITH FAN MOTOR - BATTERY)

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 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


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

NOTICE:
Inspect the relays for circuits related to this system before performing the following inspection procedure.
1.PERFORM ACTUATOR CHECK

  1. Enter actuator check mode (Toyota Fortuner RM000003R7I00HX.html).

  1. Place your hand in front of a vent and check that the air flow level changes according to the display code.

    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.
    HINT:
    The progression through the steps of the actuator check can be changed from automatic to manual by pressing the front DEF switch.


NG
Go to step 2
OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE (Toyota Fortuner RM0000045E300YX.html)

2.INSPECT BLOWER WITH FAN MOTOR SUB-ASSEMBLY


    Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50

  1. Remove the blower with fan motor sub-assembly (Toyota Fortuner RM000004RY6008X.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 (Toyota Fortuner RM000004RY6008X.html)
OK


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

  1. Disconnect the B6 blower motor control connector.

  1. Disconnect the A38 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
    B6-3 (SI) - A38-2 (BLW)
    		Always
    		Below 1 Ω
    B6-4 (GND) - Body ground
    B6-3 (SI) - Body ground
    		Always
    		10 kΩ or higher
    B6-2 (+B) - Body ground
    B6-1 (VM) - Body ground


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


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

  1. Disconnect the B6 blower motor control connector.

  1. Disconnect the B5 blower with fan motor sub-assembly connector.

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    B6-2 (+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
    B5-2 - 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
    B5-1 - Body ground
    		Always
    		10 kΩ or higher
    B5-2 - Body ground
    B6-1 (VM) - B5-1
    		Always
    		Below 1 Ω


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


5.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 assembly with its connectors still connected (Toyota Fortuner RM000001K3A018X.html).

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

    Measurement Condition
    Item
    		Content
    Tester Connection
    		A38-2 (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 (Toyota Fortuner RM000001K3A018X.html)
OK

REPLACE BLOWER MOTOR CONTROL (Toyota Fortuner RM000004RY6008X.html)