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

Vehicle Interior. Land Cruiser. Urj200, 202 Grj200 Vdj200
Heating Air Conditioning. Land Cruiser. Urj200, 202 Grj200 Vdj200

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

PERFORM ACTIVE TEST USING GTS (REAR BLOWER MOTOR)

INSPECT REAR BLOWER WITH FAN MOTOR SUB-ASSEMBLY

CHECK HARNESS AND CONNECTOR (WIRING AIR CONDITIONING HARNESS SUB-ASSEMBLY - BATTERY AND BODY GROUND)

CHECK HARNESS AND CONNECTOR (WIRING AIR CONDITIONING HARNESS SUB-ASSEMBLY - AIR CONDITIONING AMPLIFIER ASSEMBLY)

CHECK WIRING AIR CONDITIONING HARNESS SUB-ASSEMBLY

CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY

CHECK BLOWER MOTOR CONTROL

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


DESCRIPTION

The rear blower with fan motor sub-assembly is operated by signals from the air conditioning amplifier assembly. The rear blower with fan motor sub-assembly speed signals are transmitted by changes in the duty ratio.
The rear blower motor controller controls the rear blower with fan motor sub-assembly speed.

WIRING DIAGRAM


Land Cruiser. Urj200, 202 Grj200 Vdj200.Heating Air Conditioning.Air Conditioning System (For Automatic Air Conditioning System).Air Conditioning System (For Automatic Air Conditioning System) Rear 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 GTS (REAR BLOWER MOTOR)

  1. Select the Active Test, use the GTS to generate a control command, and then check that the rear blower with fan motor sub-assembly operates (Click here).

    Air Conditioner
    Tester Display
    		Test Part
    		Control Range
    		Diagnostic Note
    Rear Blower Motor
    		Rear blower with fan motor sub-assembly
    		Min.: 0, Max.: 31
    		-
    OK:
    Rear blower with fan motor sub-assembly is operated normally using the GTS.


NG
Go to step 2
OK

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE (Click here)

2.INSPECT REAR BLOWER WITH FAN MOTOR SUB-ASSEMBLY

  1. Remove the rear blower with fan motor sub-assembly (Click here).

  1. Inspect the rear blower with fan motor sub-assembly (Click here).



NG
REPLACE REAR BLOWER WITH FAN MOTOR SUB-ASSEMBLY (Click here)
OK


3.CHECK HARNESS AND CONNECTOR (WIRING AIR CONDITIONING HARNESS SUB-ASSEMBLY - BATTERY AND BODY GROUND)


    Land Cruiser. Urj200, 202 Grj200 Vdj200

  1. Disconnect the wiring air conditioning harness sub-assembly connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    4 - Body ground
    		Always
    		Below 1 Ω

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

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    1 - Body ground
    		Always
    		11 to 14 V
Text in Illustration
*a
Front view of wire harness connector
(to Wiring Air Conditioning Harness Sub-assembly)


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


4.CHECK HARNESS AND CONNECTOR (WIRING AIR CONDITIONING HARNESS SUB-ASSEMBLY - AIR CONDITIONING AMPLIFIER ASSEMBLY)

  1. Disconnect the wiring air conditioning harness sub-assembly connector.

  1. Disconnect the E36 air conditioning amplifier assembly connector.

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

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    8 - E36-17 (BLWH)
    		Always
    		Below 1 Ω
    8 or E36-17 (BLWH) - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


5.CHECK WIRING AIR CONDITIONING HARNESS SUB-ASSEMBLY

  1. Replace the wiring air conditioning harness sub-assembly with a new or known good one and check that the condition returns to normal.

    OK:
    Same problem does not occur.


NG
Go to step 6
OK

END (WIRING AIR CONDITIONING HARNESS SUB-ASSEMBLY WAS DEFECTIVE)

6.CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY


    Land Cruiser. Urj200, 202 Grj200 Vdj200.Heating Air Conditioning.Air Conditioning System (For Automatic Air Conditioning System).Air Conditioning System (For Automatic Air Conditioning System) Rear Blower Motor Circuit

  1. Using an oscilloscope, check the waveform.

    Measurement Condition
    Item
    		Content
    Terminal No. (Symbol)
    		z51-3 (SI) - Body ground
    Tool Setting
    		2 V/DIV., 500 μs/DIV.
    Condition
    1. Ignition switch ON
    2. Blower switch LO
    OK:
    Waveform is as shown in the illustration.
    HINT:
    Waveform varies with the blower level.


NG
Go to step 7
OK

REPLACE BLOWER MOTOR CONTROL (Click here)

7.CHECK BLOWER MOTOR CONTROL

  1. Replace the blower motor control with a new or known good one and check that the condition returns to normal.

    OK:
    Same problem does not occur.


NG
REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY (Click here)
OK

END (BLOWER MOTOR CONTROL WAS DEFECTIVE)