Air Conditioning System (For Automatic Air Conditioning System) Cooling Box Sensor Circuit

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

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

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

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

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

INSPECT NO. 3 COOLER THERMISTOR

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


DESCRIPTION

The No. 3 cooler thermistor is installed on the evaporator in the cooling box unit to detect the cooled air temperature that has passed through the evaporator and control the cooling box. It sends appropriate signals to the air conditioning amplifier assembly (for cool box). The resistance of the No. 3 cooler thermistor changes in accordance with the cooled air temperature that has passed through the evaporator. As the temperature decreases, the resistance increases. As the temperature increases, the resistance decreases.
The air conditioning amplifier assembly (for cool box) applies voltage (12 V) to the No. 3 cooler thermistor and reads voltage changes as the resistance of the No. 3 cooler thermistor changes.

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 Sensor Circuit


INSPECTION PROCEDURE

NOTICE:
Inspect the fuses for circuits related to this system before performing the following inspection procedure.
1.CHECK HARNESS AND CONNECTOR (NO. 1 COOLER WIRING HARNESS SUB-ASSEMBLY - 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 Sensor 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
    		Switch Condition
    		Specified Condition
    4 - Body ground
    		Always
    		11 to 14 V
    1 - Body ground
    		Engine switch off
    		Below 1 V
    1 - Body ground
    		Engine switch on (IG)
    		11 to 14 V
    Text in Illustration
    *a
    		Front view of wire harness connector
    (to No. 1 Cooler Wiring Harness Sub-assembly)


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


2.CHECK HARNESS AND CONNECTOR (NO. 1 COOLER WIRING HARNESS SUB-ASSEMBLY - 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 Sensor 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 - Body ground
    		Always
    		Below 1 Ω


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


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

  1. Replace the No. 1 cooler wiring harness sub-assembly with a new or known good one.

    OK:
    Same problem does not occur.


NG
Go to step 4
OK

END (NO. 1 COOLER WIRING HARNESS SUB-ASSEMBLY WAS DEFECTIVE)

4.INSPECT NO. 3 COOLER THERMISTOR

  1. Remove the No. 3 cooler thermistor (Click here).

  1. Inspect the No. 3 cooler thermistor (Click here).



NG
REPLACE NO. 3 COOLER THERMISTOR (Click here)
OK

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