Air Conditioning System (For Automatic Air Conditioning System) - Rear Magnetic Valve Circuit

Land Cruiser URJ200 URJ202 GRJ200 VDJ200 - HEATING / AIR CONDITIONING

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

PERFORM ACTIVE TEST USING INTELLIGENT TESTER (REAR A/C MAG VALVE)

INSPECT FUSE (A/C IG)

CHECK HARNESS AND CONNECTOR (WIRING AIR CONDITIONING HARNESS - BATTERY)

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

CHECK REAR COOLING UNIT EXPANSION VALVE (OPERATION)

CHECK WIRING AIR CONDITIONING HARNESS SUB-ASSEMBLY (OPERATION)

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

DESCRIPTION

The rear cooling unit expansion valve (rear magnetic valve) is controlled by the air conditioning amplifier assembly.


WIRING DIAGRAM

Air Conditioning System (For Automatic Air Conditioning System) - Rear Magnetic Valve Circuit. HEATING / AIR CONDITIONING. Land Cruiser URJ200 URJ202 GRJ200 VDJ200

INSPECTION PROCEDURE

1.PERFORM ACTIVE TEST USING INTELLIGENT TESTER (REAR A/C MAG VALVE)

Select the Active Test, use the intelligent tester to generate a control command, and then check that the rear cooling unit expansion valve operates.

  • OK:
  • Rear cooling unit expansion valve operates normally.
Air Conditioner
Tester DisplayTest PartControl RangeDiagnostic Note
Rear A/C Mag ValvRear cooling unit expansion valveOFF or ON-
NG
Go to step 2
OK
REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY ()
2.INSPECT FUSE (A/C IG)

Remove the A/C IG fuse from the cowl side junction block LH.

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

  • Standard Resistance:
  • Tester ConnectionConditionSpecified Condition
    A/C IG fuseAlwaysBelow 1 Ω
NG
REPLACE FUSE
OK
3.CHECK HARNESS AND CONNECTOR (WIRING AIR CONDITIONING HARNESS - BATTERY)
Air Conditioning System (For Automatic Air Conditioning System) - Rear Magnetic Valve Circuit. HEATING / AIR CONDITIONING. Land Cruiser URJ200 URJ202 GRJ200 VDJ200

Disconnect the wiring air conditioning harness sub-assembly connector.

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

  • Standard Voltage:
  • Tester ConnectionConditionSpecified Condition
    2 (+S) - Body groundEngine switch offBelow 1 V
    Engine switch on (IG)11 to 14 V
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
4.CHECK HARNESS AND CONNECTOR (WIRING AIR CONDITIONING HARNESS - AIR CONDITIONING AMPLIFIER)
Air Conditioning System (For Automatic Air Conditioning System) - Rear Magnetic Valve Circuit. HEATING / AIR CONDITIONING. Land Cruiser URJ200 URJ202 GRJ200 VDJ200

Disconnect the wiring air conditioning harness sub-assembly connector.

Disconnect the E36 amplifier connector.

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

  • Standard Resistance:
  • Tester ConnectionConditionSpecified Condition
    3 (RMGV) - E36-19 (RMGV)AlwaysBelow 1 Ω
    3 (RMGV) - Body groundAlways10 kΩ or higher
    E36-19 (RMGV) - Body ground
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
5.CHECK REAR COOLING UNIT EXPANSION VALVE (OPERATION)

Replace the rear cooling unit expansion valve ().

  • 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
REPLACE REAR COOLING UNIT EXPANSION VALVE ()
6.CHECK WIRING AIR CONDITIONING HARNESS SUB-ASSEMBLY (OPERATION)

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

  • OK:
  • Same problem does not occur.
NG
REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY ()
OK
REPLACE WIRING AIR CONDITIONING HARNESS SUB-ASSEMBLY