Air Conditioning System (For Automatic Air Conditioning System) Rear Air Conditioning Relay Circuit

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

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

INSPECT FUSE (A/C IG, RR A/C NO.2)

INSPECT RR A/C RELAY

INSPECT REAR BLOWER MOTOR

INSPECT NO. 2 AIR CONDITIONING CONTROL ASSEMBLY (REAR BLOWER SWITCH)

INSPECT REAR BLOWER RESISTOR

CHECK REAR COOLING UNIT EXPANSION VALVE (OPERATION)

CHECK HARNESS AND CONNECTOR (REAR BLOWER RESISTOR - WIRING AIR CONDITIONING HARNESS)

CHECK HARNESS AND CONNECTOR (REAR BLOWER SWITCH - WIRING AIR CONDITIONING HARNESS)

CHECK HARNESS AND CONNECTOR (REAR BLOWER RESISTOR - REAR BLOWER MOTOR)

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

CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - BATTERY AND BODY GROUND)

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


DESCRIPTION

When the No. 2 air conditioning control assembly (rear blower switch) is set to position LO or higher, the contact of the RR A/C relay is closed, current flows to the rear blower motor, and the rear blower motor operates. The rear blower motor speed can be changed by exchanging the ground and the rear blower resistor circuit with the No. 2 air conditioning control assembly (rear blower switch).

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 Air Conditioning Relay Circuit


INSPECTION PROCEDURE

1.INSPECT FUSE (A/C IG, RR A/C NO.2)

  1. Remove the A/C IG and RR A/C NO. 2 fuses from the cowl side junction block LH.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    A/C IG fuse
    		Always
    		Below 1 Ω
    RR A/C NO. 2 fuse
    		Always
    		Below 1 Ω


NG
REPLACE FUSE
OK


2.INSPECT RR A/C RELAY
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 Air Conditioning Relay Circuit

  1. Remove the RR A/C relay from the engine room relay block.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    3 - 4
    		Battery voltage is not applied between terminals 1 and 2
    		Below 1 Ω
    3 - 5
    		Battery voltage is not applied between terminals 1 and 2
    		10 kΩ or higher
    3 - 4
    		Battery voltage is applied to terminals 1 and 2
    		10 kΩ or higher
    3 - 5
    		Battery voltage is applied to terminals 1 and 2
    		Below 1 Ω


NG
REPLACE RR A/C RELAY
OK


3.INSPECT REAR BLOWER MOTOR
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 Air Conditioning Relay Circuit

  1. Disconnect the z49 motor connector.

  1. Connect the battery's positive (+) lead to terminal 2 and the negative (-) lead to terminal 1, then check that the rear blower motor operates smoothly.

    OK:
    The rear blower motor operates smoothly.

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

    Standard Current:
    Tester Connection
    		Condition
    		Specified Condition
    z49-1 (-) - z49-2 (+)
    		Rear blower motor operates
    		1 to 3 A


NG
REPLACE REAR BLOWER MOTOR (Click here)
OK


4.INSPECT NO. 2 AIR CONDITIONING CONTROL ASSEMBLY (REAR BLOWER SWITCH)
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 Air Conditioning Relay Circuit

  1. Remove the No. 2 air conditioning control assembly (Click here).

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

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    ALL - E89-6 (E)
    		OFF
    		10 kΩ or higher
    E89-5 (LO) - E89-6 (E)
    		LO
    		Below 1 Ω
    E89-3 (M1) - E89-6 (E)
    		M1
    		Below 1 Ω
    E89-4 (M2) - E89-6 (E)
    		M2
    		Below 1 Ω
    E89-8 (HI) - E89-6 (E)
    		HI
    		Below 1 Ω


NG
REPLACE NO. 2 AIR CONDITIONING CONTROL ASSEMBLY (Click here)
OK


5.INSPECT REAR BLOWER RESISTOR
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 Air Conditioning Relay Circuit

  1. Remove the rear blower resistor (Click here).

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    z52-1 (HI) - z52-2 (M1)
    		Always
    		1.32 to 1.52 Ω
    z52-1 (HI) - z52-3 (M2)
    		Always
    		0.39 to 0.45 Ω
    z52-1 (HI) - z52-4 (LO)
    		Always
    		2.24 to 2.4 Ω


NG
REPLACE REAR BLOWER RESISTOR (Click here)
OK


6.CHECK REAR COOLING UNIT EXPANSION VALVE (OPERATION)

  1. Replace the rear cooling unit expansion valve (Click here).

    HINT:
    Since the rear cooling unit expansion valve cannot be inspected while it is removed from the vehicle, replace the rear cooling unit expansion valve with a normal one and check that the condition returns to normal.
    OK:
    Same problem does not occur.


NG
Go to step 7
OK

CHECK REAR COOLING UNIT EXPANSION VALVE (Click here)

7.CHECK HARNESS AND CONNECTOR (REAR BLOWER RESISTOR - WIRING AIR CONDITIONING HARNESS)
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 Air Conditioning Relay Circuit

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

  1. Disconnect the z52 rear blower resistor connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    6 (M1) - z52-2 (M1)
    		Always
    		Below 1 Ω
    5 (M2) - z52-3 (M2)
    		Always
    		Below 1 Ω
    4 (HI) - z52-1 (HI)
    		Always
    		Below 1 Ω
    7 (LO) - z52-4 (LO)
    		Always
    		Below 1 Ω


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


8.CHECK HARNESS AND CONNECTOR (REAR BLOWER SWITCH - WIRING AIR CONDITIONING HARNESS)
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 Air Conditioning Relay Circuit

  1. Disconnect the E89 No. 2 air conditioning control assembly connector.

  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
    E89-3 (M1) - 6 (M1)
    		Always
    		Below 1 Ω
    E89-4 (M2) - 5 (M2)
    		Always
    		Below 1 Ω
    E89-8 (HI) - 4 (HI)
    		Always
    		Below 1 Ω
    E89-5 (LO) - 7 (LO)
    		Always
    		Below 1 Ω
    E89-6 (E) - Body ground
    		Always
    		Below 1 Ω


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


9.CHECK HARNESS AND CONNECTOR (REAR BLOWER RESISTOR - REAR BLOWER MOTOR)
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 Air Conditioning Relay Circuit

  1. Disconnect the z52 rear blower resistor connector.

  1. Disconnect the z49 rear motor connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    z52-1 (HI) - z49-1
    		Always
    		Below 1 Ω


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


10.CHECK HARNESS AND CONNECTOR (REAR BLOWER MOTOR - BODY GROUND AND BATTERY)
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 Air Conditioning Relay Circuit

  1. Disconnect the z49 rear motor connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    z49-2 - Body ground
    		Always
    		Below 1 Ω

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    z49-2 - Body ground
    		Engine switch on (IG)
    Heater control (blower switch) HI
    		11 to 14 V


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


11.CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - BATTERY AND BODY GROUND)
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 Air Conditioning Relay Circuit

  1. Disconnect the E81air conditioning amplifier connector.

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    E81-18 (RCRL) - Body ground
    		Engine switch on (IG)
    Heater control (blower switch): OFF
    		11 to 14 V
    E81-18 (RCRL) - Body ground
    		Engine switch on (IG)
    Heater control (blower switch): ON
    		Below 1 V

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    E81-14 (GND) - Body ground
    		Always
    		Below 1 Ω


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

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