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


DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

PERFORM ACTIVE TEST USING INTELLIGENT TESTER (BLOWER WITH FAN MOTOR)

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

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

CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY (BLW SIGNAL)

CHECK BLOWER WITH FAN MOTOR SUB-ASSEMBLY

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


DESCRIPTION

Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Heating Air Conditioning.Air Conditioning System (For Automatic Air Conditioning System).Air Conditioning System (For Manual Air Conditioning System) Blower Motor Circuit
The blower with fan motor sub-assembly operates according to signals from the air conditioning amplifier assembly. The blower with fan motor sub-assembly speed signals are transmitted by changes in the duty ratio.
Duty Ratio:
The duty ratio is the ratio of the blower with fan motor sub-assembly on time (T1) to the total of the blower with fan motor sub-assembly on and off time (T2).
The air conditioning amplifier assembly controls the blower with fan motor sub-assembly speed.

WIRING DIAGRAM


Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Heating Air Conditioning.Air Conditioning System (For Automatic Air Conditioning System).Air Conditioning System (For Manual Air Conditioning System) Blower Motor Circuit


INSPECTION PROCEDURE

NOTICE:
Inspect the fuses for circuits related to this system before performing the following inspection procedure.
1.PERFORM ACTIVE TEST USING INTELLIGENT TESTER (BLOWER WITH FAN MOTOR)

  1. Select the Active Test, use the intelligent tester to generate a control command, and then check that the blower with fan motor sub-assembly operates (LandCruiser RM000002LIV041X.html).

    Air Conditioner
    Tester Display
    		Test Part
    		Control Range
    		Diagnostic Note
    Blower Motor
    		Blower with fan motor sub-assembly
    		Min.: 0, Max.: 31
    		-
    OK:
    Blower with fan motor sub-assembly operates and blower motor speed changes.


NG
Go to step 2
OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE (LandCruiser RM0000045EC00TX.html)

2.CHECK HARNESS AND CONNECTOR (BLOWER WITH FAN MOTOR - BATTERY AND BODY GROUND)


    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Heating Air Conditioning.Air Conditioning System (For Automatic Air Conditioning System).Air Conditioning System (For Manual Air Conditioning System) Blower Motor Circuit

  1. Disconnect the G26 motor connector.

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

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    G26-3 - Body ground
    		Always
    		11 to 14 V

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    G26-1 - Body ground
    		Always
    		Below 1 Ω
Text in Illustration
*a
Front view of wire harness connector
(to Blower with Fan Motor Sub-assembly)


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


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

  1. Disconnect the G25 amplifier connector.

  1. Disconnect the G26 motor connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    G25-23 (BLW) - G26-2
    		Always
    		Below 1 Ω
    G25-23 (BLW) - Body ground
    		Always
    		10 kΩ or higher
    G25-14 (GND) - Body ground
    		Always
    		Below 1 Ω


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


4.CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY (BLW SIGNAL)


    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Heating Air Conditioning.Air Conditioning System (For Automatic Air Conditioning System).Air Conditioning System (For Manual Air Conditioning System) Blower Motor Circuit

  1. Remove the air conditioning amplifier assembly with its connectors still connected (LandCruiser RM0000039R5028X.html).

  1. Using an oscilloscope, check the waveform.

    Measurement Condition
    Item
    		Content
    Terminal No. (Symbol)
    		G25-23 (BLW) - G25-14 (GND)
    Tool Setting
    		1 V/DIV., 500 μs/DIV.
    Condition
    		Ignition switch ON
    Blower switch LO
    OK:
    Waveform is as shown in the illustration.
    Text in Illustration
    *a
    		Component with harness connected
    (Air Conditioning Amplifier Assembly)
    HINT:
    Waveform varies with the blower level.


NG
REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY (LandCruiser RM0000039R5028X.html)
OK


5.CHECK BLOWER WITH FAN MOTOR SUB-ASSEMBLY

  1. Replace the blower with fan motor sub-assembly with a new or normally functioning one (LandCruiser RM000002PKP02KX.html).

  1. Operate the blower with fan motor sub-assembly to check that it functions properly.

    OK:
    Blower with fan motor sub-assembly operates normally.


NG
REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY (LandCruiser RM0000039R5028X.html)
OK

END (BLOWER WITH FAN MOTOR SUB-ASSEMBLY IS FAULTY)