Air Conditioning System (For Automatic Air Conditioning System) Ptc Heater Circuit

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

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

INSPECT PTC HEATER RELAY (PTC HTR1)

INSPECT PTC HEATER RELAY (PTC HTR2)

INSPECT PTC HEATER RELAY (PTC HTR3)

CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY

CHECK HARNESS AND CONNECTOR (PTC HEATER RELAY - QUICK HEATER)

INSPECT QUICK HEATER ASSEMBLY

CHECK HARNESS AND CONNECTOR (QUICK HEATER - BODY GROUND)

CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - PTC HTR RELAY)

AIR CONDITIONING SYSTEM (for Automatic Air Conditioning System) - PTC Heater Circuit


DESCRIPTION

PTC heater relays are closed in accordance with signals from the air conditioning amplifier assembly and power is supplied to the quick heater assembly installed on the radiator heater unit.

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) Ptc Heater Circuit


INSPECTION PROCEDURE

1.INSPECT PTC HEATER RELAY (PTC HTR1)
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) Ptc Heater Circuit

  1. Remove the PTC HTR1 relay 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
    3 - 5
    		Battery voltage not applied between terminals 1 and 2
    		10 kΩ or higher
    Battery voltage applied to terminals 1 and 2
    		Below 1 Ω


NG
REPLACE PTC HEATER RELAY
OK


2.INSPECT PTC HEATER RELAY (PTC HTR2)
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) Ptc Heater Circuit

  1. Remove the PTC HTR2 relay 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
    3 - 5
    		Battery voltage not applied between terminals 1 and 2
    		10 kΩ or higher
    Battery voltage applied to terminals 1 and 2
    		Below 1 Ω


NG
REPLACE PTC HEATER RELAY
OK


3.INSPECT PTC HEATER RELAY (PTC HTR3)
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) Ptc Heater Circuit

  1. Remove the PTC HTR3 relay 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
    3 - 5
    		Battery voltage not applied between terminals 1 and 2
    		10 kΩ or higher
    Battery voltage applied to terminals 1 and 2
    		Below 1 Ω


NG
REPLACE PTC HEATER RELAY
OK


4.CHECK AIR CONDITIONING AMPLIFIER 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) Ptc Heater Circuit

  1. w/ Rear Heater

    1. Remove the air conditioning amplifier assembly with its connectors still connected (Click here).

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

      Standard Voltage:
      Tester Connection
      		Condition
      		Specified Condition
      E36-27 (PTC1) - Body ground
      		Engine switch on (IG)
      Temperature setting: MAX, HOT
      MODE switch: FOOT
      Engine coolant temperature: 55°C (131°F) or less
      Blower switch: off
      		11 to 14 V
      E36-26 (PTC2) - Body ground
      E36-35 (PTC3) - 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) Ptc Heater Circuit

  1. w/o Rear Heater

    1. Remove the air conditioning amplifier assembly with its connectors still connected (Click here).

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

      Standard Voltage:
      Tester Connection
      		Condition
      		Specified Condition
      E81-3 (PTC1) - Body ground
      		Engine switch on (IG)
      Temperature setting: MAX, HOT
      MODE switch: FOOT
      Engine coolant temperature: 55°C (131°F) or less
      Blower switch: off
      		11 to 14 V
      E81-22 (PTC2) - Body ground
      E81-4 (PTC3) - Body ground


NG
Go to step 8
OK


5.CHECK HARNESS AND CONNECTOR (PTC HEATER RELAY - QUICK HEATER)
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) Ptc Heater Circuit

  1. Remove the quick heater relays from the engine room relay block.

  1. Disconnect the E33 quick heater assembly connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    PTC HTR2 terminal 3 - E33-1 (B)
    		Always
    		Below 1 Ω
    PTC HTR1 terminal 3 - E33-2 (B)
    PTC HTR3 terminal 3 - E33-3 (B)
    PTC HTR2 terminal 3 - Body ground
    		Always
    		10 kΩ or higher
    PTC HTR1 terminal 3 - Body ground
    PTC HTR3 terminal 3 - Body ground


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


6.INSPECT QUICK HEATER 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) Ptc Heater Circuit

  1. Disconnect the E33 and E34 quick heater connectors.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    E33-1 (B) - E34-1 (E)
    		Always
    		Below 1 Ω
    E33-2 (B) - E34-1 (E)
    E33-3 (B) - E34-2 (E)


NG
REPLACE QUICK HEATER RELAY (Click here)
OK


7.CHECK HARNESS AND CONNECTOR (QUICK HEATER - 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) Ptc Heater Circuit

  1. Disconnect the E34 quick heater assembly connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    E34-1 (E) - Body ground
    		Always
    		10 kΩ or higher
    E34-2 (E) - Body ground


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


8.CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - PTC HTR RELAY)
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) Ptc Heater Circuit

  1. w/ Rear Heater

    1. Disconnect the E36 amplifier connector.

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

      Standard Resistance:
      Tester Connection
      		Condition
      		Specified Condition
      E36-27 (PTC1) - Body ground
      		Always
      		Below 1 Ω
      E36-26 (PTC2) - Body ground
      E36-35 (PTC3) - 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) Ptc Heater Circuit

  1. w/o Rear Heater

    1. Disconnect the E81 amplifier connector.

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

      Standard Resistance:
      Tester Connection
      		Condition
      		Specified Condition
      E81-3 (PTC1) - Body ground
      		Always
      		Below 1 Ω
      E81-22 (PTC2) - Body ground
      E81-4 (PTC3) - Body ground
      Result
      Result
      		Proceed to
      OK (for LHD)
      		A
      OK (for RHD)
      		B
      NG
      		C


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY (Click here)