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 CLR RR RELAY

INSPECT REAR BLOWER WITH FAN MOTOR SUB-ASSEMBLY

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 SUB-ASSEMBLY)

CHECK HARNESS AND CONNECTOR (NO. 2 AIR CONDITIONING CONTROL ASSEMBLY - WIRING AIR CONDITIONING HARNESS SUB-ASSEMBLY)

CHECK HARNESS AND CONNECTOR (REAR BLOWER RESISTOR - REAR BLOWER WITH FAN MOTOR SUB-ASSEMBLY)

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

CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER ASSEMBLY - 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 CLR RR 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

NOTICE:
Inspect the fuses for circuits related to this system before performing the following inspection procedure.
1.INSPECT CLR RR RELAY

  1. Remove the CLR RR relay from the No.1 engine room relay block.

  1. Measure the CLR RR relay (Click here).



NG
REPLACE CLR RR RELAY
OK


2.INSPECT REAR BLOWER WITH FAN MOTOR SUB-ASSEMBLY

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

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



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


3.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


4.INSPECT REAR BLOWER RESISTOR

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

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



NG
REPLACE REAR BLOWER RESISTOR (Click here)
OK


5.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 6
OK

CHECK REAR COOLING UNIT EXPANSION VALVE (Click here)

6.CHECK HARNESS AND CONNECTOR (REAR BLOWER RESISTOR - WIRING AIR CONDITIONING HARNESS SUB-ASSEMBLY)

  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
    6 (M1) or z52-2 (M1) - Body ground
    		Always
    		10 kΩ or higher
    5 (M2) or z52-3 (M2) - Body ground
    		Always
    		10 kΩ or higher
    4 (HI) or z52-1 (HI) - Body ground
    		Always
    		10 kΩ or higher
    7 (LO) or z52-4 (LO) - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


7.CHECK HARNESS AND CONNECTOR (NO. 2 AIR CONDITIONING CONTROL ASSEMBLY - WIRING AIR CONDITIONING HARNESS SUB-ASSEMBLY)

  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
    E89-3 (M1) or 6 (M1) - Body ground
    		Always
    		10 kΩ or higher
    E89-4 (M2) or 5 (M2) - Body ground
    		Always
    		10 kΩ or higher
    E89-8 (HI) or 4 (HI) - Body ground
    		Always
    		10 kΩ or higher
    E89-5 (LO) or 7 (LO) - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


8.CHECK HARNESS AND CONNECTOR (REAR BLOWER RESISTOR - REAR BLOWER WITH FAN MOTOR SUB-ASSEMBLY)

  1. Disconnect the z52 rear blower resistor connector.

  1. Disconnect the z49 rear blower with fan motor sub-assembly 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
    z52-1 (HI) or z49-1 - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


9.CHECK HARNESS AND CONNECTOR (REAR BLOWER WITH FAN MOTOR SUB-ASSEMBLY - 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 rear blower with fan motor sub-assembly 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
    		Ignition switch ON
    Heater control (blower switch) HI
    		11 to 14 V
Text in Illustration
*a
Front view of wire harness connector
(to Rear Blower with Fan Motor Sub-assembly)


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


10.CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER ASSEMBLY - 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 air conditioning amplifier connector.

  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

  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
    1. Ignition switch ON
    2. Heater control (blower switch): OFF
    		11 to 14 V
    E81-18 (RCRL) - Body ground
    1. Ignition switch ON
    2. Heater control (blower switch): ON
    		Below 1 V
Text in Illustration
*a
Rear view of wire harness connector
(to Air Conditioning Amplifier Assembly)


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

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