Air Conditioning System (For Automatic Air Conditioning System) - Cooling Box Control Switch Circuit

Land Cruiser URJ200 URJ202 GRJ200 VDJ200 - HEATING / AIR CONDITIONING

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

Air Conditioning System (For Automatic Air Conditioning System) - Cooling Box Control Switch Circuit. HEATING / AIR CONDITIONING. Land Cruiser URJ200 URJ202 GRJ200 VDJ200

INSPECTION PROCEDURE

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

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

Remove the ECU-B1 fuse from the engine room relay block.

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

  • Standard Resistance:
  • Tester ConnectionConditionSpecified Condition
    PANEL fuseAlwaysBelow 1 Ω
    ECU-B1 fuseAlwaysBelow 1 Ω
    A/C IG fuseAlwaysBelow 1 Ω
NG
REPLACE FUSE
OK
2.CHECK HARNESS AND CONNECTOR (NO. 1 COOLER WIRING HARNESS - BATTERY)
Air Conditioning System (For Automatic Air Conditioning System) - Cooling Box Control Switch Circuit. HEATING / AIR CONDITIONING. Land Cruiser URJ200 URJ202 GRJ200 VDJ200

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

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

  • Standard Voltage:
  • Tester ConnectionConditionSpecified Condition
    4 (+B) - Body groundAlways11 to 14 V
    1 (B) - Body groundEngine switch offBelow 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)
Air Conditioning System (For Automatic Air Conditioning System) - Cooling Box Control Switch Circuit. HEATING / AIR CONDITIONING. Land Cruiser URJ200 URJ202 GRJ200 VDJ200

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

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

  • Standard Resistance:
  • Tester ConnectionConditionSpecified Condition
    6 (L) - Body groundAlwaysBelow 1 Ω
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
4.CHECK NO. 1 COOLER WIRING HARNESS SUB-ASSEMBLY (OPERATION)

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
Air Conditioning System (For Automatic Air Conditioning System) - Cooling Box Control Switch Circuit. HEATING / AIR CONDITIONING. Land Cruiser URJ200 URJ202 GRJ200 VDJ200

Remove the cooler control switch sub-assembly ().

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

  • Standard Resistance:
  • Tester ConnectionSwitch ConditionSpecified Condition
    1 - 2OnBelow 1 Ω
    1 - 2Off10 kΩ or higher

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

  • OK:
  • Measurement ConditionSpecified 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 ()
OK
REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY (for Cool Box) ()