Air Conditioning System (For Automatic Air Conditioning System) Cooling Box Control Switch 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 (PANEL, A/C IG, ECU-B1)

CHECK HARNESS AND CONNECTOR (NO. 1 COOLER WIRING HARNESS - BATTERY)

CHECK HARNESS AND CONNECTOR (NO. 1 COOLER WIRING HARNESS - BODY GROUND)

CHECK NO. 1 COOLER WIRING HARNESS SUB-ASSEMBLY (OPERATION)

INSPECT COOLER CONTROL SWITCH SUB-ASSEMBLY

AIR CONDITIONING SYSTEM (for Automatic Air Conditioning System) - Cooling Box Control Switch Circuit


DESCRIPTION

The cooler control switch is the activation switch for the cooling box. If the cooling box does not activate when the cooler control switch is pushed, there may be a malfunction in the circuit shown below.

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) Cooling Box Control Switch Circuit


INSPECTION PROCEDURE

1.INSPECT FUSE (PANEL, A/C IG, ECU-B1)

  1. Remove the PANEL and A/C IG fuses from the cowl side junction block LH.

  1. Remove the ECU-B1 fuse 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
    PANEL fuse
    		Always
    		Below 1 Ω
    ECU-B1 fuse
    		Always
    		Below 1 Ω
    A/C IG fuse
    		Always
    		Below 1 Ω


NG
REPLACE FUSE
OK


2.CHECK HARNESS AND CONNECTOR (NO. 1 COOLER WIRING HARNESS - 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) Cooling Box Control Switch Circuit

  1. Disconnect the No. 1 cooler wiring harness sub-assembly connector.

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

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    4 (+B) - Body ground
    		Always
    		11 to 14 V
    1 (B) - Body ground
    		Engine switch off
    		Below 1 V
    Engine switch on (IG)
    		11 to 14 V


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


3.CHECK HARNESS AND CONNECTOR (NO. 1 COOLER WIRING HARNESS - 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) Cooling Box Control Switch Circuit

  1. Disconnect the No. 1 cooler wiring harness sub-assembly connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    6 (L) - Body ground
    		Always
    		Below 1 Ω


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


4.CHECK NO. 1 COOLER WIRING HARNESS SUB-ASSEMBLY (OPERATION)

  1. Replace the No. 1 cooler wiring harness sub-assembly with a normal one and check that the condition returns to normal.

    OK:
    Same problem does not occur.


NG
Go to step 5
OK

REPLACE NO. 1 COOLER WIRING HARNESS SUB-ASSEMBLY

5.INSPECT COOLER CONTROL SWITCH SUB-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) Cooling Box Control Switch Circuit

  1. Remove the cooler control switch sub-assembly (Click here).

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

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    1 - 2
    		On
    		Below 1 Ω
    1 - 2
    		Off
    		10 kΩ or higher

  1. Apply battery voltage to the cooler control switch connector and check that the cooler control switch illuminates.

    OK:
    Measurement Condition
    		Specified Condition
    Battery positive (+) → Terminal 3
    Battery negative (-) → Terminal 4
    		LED illuminates
    Battery positive (+) → Terminal 5
    Battery negative (-) → Terminal 6
    		LED illuminates


NG
REPLACE COOLER CONTROL SWITCH SUB-ASSEMBLY (Click here)
OK

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY (for Cool Box) (Click here)