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, PTC HTR2, PTC HTR3)

CHECK HARNESS AND CONNECTOR (PTC HEATER RELAY - BATTERY)

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

CHECK HARNESS AND CONNECTOR (QUICK HEATER ASSEMBLY - PTC HEATER RELAY AND BODY GROUND)

INSPECT QUICK HEATER ASSEMBLY

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


DESCRIPTION

The air conditioning amplifier assembly sends operation signals to the PTC heater relays when quick heater assembly operation conditions are met. Based on the signals from the air conditioning amplifier assembly, the PTC heater relays turn on, and power is supplied to the quick heater assembly installed in the air conditioning radiator assembly.

Control ECU
Condition
Air Conditioning Amplifier Assembly
Start the engine
Combination switch assembly (ECO mode switch) off
Blower switch: LO or more
Temperature settings: MAX HOT
  1. Engine coolant temperature 65°C (149°F), or lower (3 PTC heater relays operating)
  2. Engine coolant temperature 70°C (158°F), or lower (2 PTC heater relays operating)
  3. Engine coolant temperature 75°C (167°F), or lower (A PTC heater relay operating)
Ambient temperature 10°C (50°F) or lower

WIRING DIAGRAM


w/ Rear 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


w/o Rear 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


INSPECTION PROCEDURE

NOTICE:
Inspect the fuses for circuits related to this system before performing the following inspection procedure.
1.INSPECT PTC HEATER RELAY (PTC HTR1, PTC HTR2, PTC HTR3)

  1. Remove the PTC heater relay from the No. 1 engine room relay block.

  1. Inspect the PTC heater relay (Click here).



NG
REPLACE PTC HEATER RELAY
OK


2.CHECK HARNESS AND CONNECTOR (PTC HEATER RELAY - BATTERY)

  1. Remove the PTC heater relays from the No. 1 engine room relay block.

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

    Standard Voltage:
    PTC HTR NO.1:
    Tester Connection
    		Condition
    		Specified Condition
    Relay block PTC HTR1 relay terminal 2 - Body ground
    		Ignition switch off
    		Below 1 V
    Relay block PTC HTR1 relay terminal 2 - Body ground
    		Ignition switch ON
    		11 to 14 V
    Relay block PTC HTR1 relay terminal 5 - Body ground
    		Always
    		11 to 14 V
    PTC HTR NO.2:
    Tester Connection
    		Condition
    		Specified Condition
    Relay block PTC HTR2 relay terminal 2 - Body ground
    		Ignition switch off
    		Below 1 V
    Relay block PTC HTR2 relay terminal 2 - Body ground
    		Ignition switch ON
    		11 to 14 V
    Relay block PTC HTR2 relay terminal 5 - Body ground
    		Always
    		11 to 14 V
    PTC HTR NO.3:
    Tester Connection
    		Condition
    		Specified Condition
    Relay block PTC HTR3 relay terminal 2 - Body ground
    		Ignition switch off
    		Below 1 V
    Relay block PTC HTR3 relay terminal 2 - Body ground
    		Ignition switch ON
    		11 to 14 V
    Relay block PTC HTR3 relay terminal 5 - Body ground
    		Always
    		11 to 14 V


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


3.CHECK HARNESS AND CONNECTOR (PTC HEATER RELAY - AIR CONDITIONING AMPLIFIER ASSEMBLY)

  1. w/ Rear Heater:

    1. Remove the PTC heater relays from the No. 1 engine room relay block.

    2. Disconnect the E36 air conditioning amplifier assembly connector.

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

      Standard Resistance:
      PTC HTR NO.1:
      Tester Connection
      		Condition
      		Specified Condition
      Relay block PTC HTR1 relay terminal 1 - E36-8 (PTC1)
      		Always
      		Below 1 Ω
      Relay block PTC HTR1 relay terminal 1 or E36-8 (PTC1) - Body ground
      		Always
      		10 kΩ or higher
      PTC HTR NO.2:
      Tester Connection
      		Condition
      		Specified Condition
      Relay block PTC HTR2 relay terminal 1 - E36-26 (PTC2)
      		Always
      		Below 1 Ω
      Relay block PTC HTR2 relay terminal 1 or E36-26 (PTC2) - Body ground
      		Always
      		10 kΩ or higher
      PTC HTR NO.3:
      Tester Connection
      		Condition
      		Specified Condition
      Relay block PTC HTR3 relay terminal 1 - E36-24 (PTC3)
      		Always
      		Below 1 Ω
      Relay block PTC HTR3 relay terminal 1 or E36-24 (PTC3) - Body ground
      		Always
      		10 kΩ or higher

  1. w/o Rear Heater:

    1. Remove the PTC heater relays from the No. 1 engine room relay block.

    2. Disconnect the E81 air conditioning amplifier assembly connector.

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

      Standard Resistance:
      PTC HTR NO.1:
      Tester Connection
      		Condition
      		Specified Condition
      Relay block PTC HTR1 relay terminal 1 - E81-40 (PTC1)
      		Always
      		Below 1 Ω
      Relay block PTC HTR1 relay terminal 1 or E81-40 (PTC1) - Body ground
      		Always
      		10 kΩ or higher
      PTC HTR NO.2:
      Tester Connection
      		Condition
      		Specified Condition
      Relay block PTC HTR2 relay terminal 1 - E81-3 (PTC2)
      		Always
      		Below 1 Ω
      Relay block PTC HTR2 relay terminal 1 or E81-3 (PTC2) - Body ground
      		Always
      		10 kΩ or higher
      PTC HTR NO.3:
      Tester Connection
      		Condition
      		Specified Condition
      Relay block PTC HTR3 relay terminal 1 - E81-36 (PTC3)
      		Always
      		Below 1 Ω
      Relay block PTC HTR3 relay terminal 1 or E81-36 (PTC3) - Body ground
      		Always
      		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


4.CHECK HARNESS AND CONNECTOR (QUICK HEATER ASSEMBLY - PTC HEATER RELAY AND BODY GROUND)

  1. for 600 W:

    1. Remove the PTC heater relays from the No. 1 engine room relay block.

    2. Disconnect the E33 and E34 quick heater assembly connectors.

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

      Standard Resistance:
      PTC HTR NO.1:
      Tester Connection
      		Condition
      		Specified Condition
      E33-2 (B) - Relay block PTC HTR1 relay terminal 3
      		Always
      		Below 1 Ω
      E34-1 (E) - Body ground
      		Always
      		Below 1 Ω
      E34-2 (E) - Body ground
      		Always
      		Below 1 Ω
      E33-2 (B) or Relay block PTC HTR1 relay terminal 3 - Body ground
      		Always
      		10 kΩ or higher
      PTC HTR NO.2:
      Tester Connection
      		Condition
      		Specified Condition
      E33-1 (B) - Relay block PTC HTR2 relay terminal 3
      		Always
      		Below 1 Ω
      E34-1 (E) - Body ground
      		Always
      		Below 1 Ω
      E33-1 (B) or Relay block PTC HTR2 relay terminal 3 - Body ground
      		Always
      		10 kΩ or higher
      PTC HTR NO.3:
      Tester Connection
      		Condition
      		Specified Condition
      E33-3 (B) - Relay block PTC HTR3 relay terminal 3
      		Always
      		Below 1 Ω
      E34-2 (E) - Body ground
      		Always
      		Below 1 Ω
      E33-3 (B) or Relay block PTC HTR3 relay terminal 3 - Body ground
      		Always
      		10 kΩ or higher

  1. for 840 W:

    1. Remove the PTC heater relays from the No. 1 engine room relay block.

    2. Disconnect the E33, E34 and E110 quick heater assembly connectors.

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

      Standard Resistance:
      PTC HTR NO.1:
      Tester Connection
      		Condition
      		Specified Condition
      E33-3 (B) - Relay block PTC HTR1 relay terminal 3
      		Always
      		Below 1 Ω
      E110-1 (E) - Body ground
      		Always
      		Below 1 Ω
      E34-1 (E) - Body ground
      		Always
      		Below 1 Ω
      E33-3 (B) or Relay block PTC HTR1 relay terminal 3 - Body ground
      		Always
      		10 kΩ or higher
      PTC HTR NO.2:
      Tester Connection
      		Condition
      		Specified Condition
      E33-2 (B) - Relay block PTC HTR2 relay terminal 3
      		Always
      		Below 1 Ω
      E110-1 (E) - Body ground
      		Always
      		Below 1 Ω
      E33-2 (B) or Relay block PTC HTR2 relay terminal 3 - Body ground
      		Always
      		10 kΩ or higher
      PTC HTR NO.3:
      Tester Connection
      		Condition
      		Specified Condition
      E33-1 (B) - Relay block PTC HTR3 relay terminal 3
      		Always
      		Below 1 Ω
      E34-1 (E) - Body ground
      		Always
      		Below 1 Ω
      E33-1 (B) or Relay block PTC HTR3 relay terminal 3 - Body ground
      		Always
      		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


5.INSPECT QUICK HEATER ASSEMBLY

  1. Remove the quick heater assembly (Click here).

  1. Inspect the quick heater assembly (Click here).



NG
REPLACE QUICK HEATER ASSEMBLY (Click here)
OK

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE (Click here)