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

DESCRIPTION

The quick heater relays is controlled 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

A004AAGE02

CAUTION / NOTICE / HINT

Note

Inspect the fuses for circuits related to this system before performing the following inspection procedures.

PROCEDURE


  1. PERFORM ACTIVE TEST USING GTS (HEATER ACTIVE LEVEL)


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Enter the following menus: Body Electrical / Air Conditioner / Active Test.

    5. According to the display on the GTS, perform the Active Test.

      Air Conditioner
      Tester Display Test Part Control Range Diagnostic Note
      Heater Active Level Heater level Min.: 0, Max.: 3 -
      OK
      Heater Active Level changes normally.

    NG

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here

    OK

  2. INSPECT QUICK HEATER RELAY


    1. Remove the quick heater relay.

    2. Inspect the quick heater relay Click here.


    NG

    REPLACE QUICK HEATER RELAY

    OK

  3. INSPECT QUICK HEATER ASSEMBLY


    1. Remove the quick heater assembly Click here.

    2. Inspect the quick heater assembly Click here.


    NG

    REPLACE QUICK HEATER ASSEMBLY Click here

    OK

  4. CHECK HARNESS AND CONNECTOR (QUICK HEATER RELAY - BATTERY AND IG1 NO. 1 RELAY)

    A0047ZLE02
    Text in Illustration
    *1 No. 2 Engine Room Relay Block
    *2 PTC HTR NO. 1 Relay Holder
    *3 PTC HTR NO. 2 Relay Holder
    *4 PTC HTR NO. 3 Relay Holder

    1. Remove the quick heater relay.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      PTC HTR NO. 1-5 - Body ground Always 11 to 14 V
      PTC HTR NO. 1-2 - Body ground Ignition switch ON 11 to 14 V
      PTC HTR NO. 2-3 - Body ground Always 11 to 14 V
      PTC HTR NO. 2-1 - Body ground Ignition switch ON 11 to 14 V
      PTC HTR NO. 3-3 - Body ground Always 11 to 14 V
      PTC HTR NO. 3-2 - Body ground Ignition switch ON 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. CHECK HARNESS AND CONNECTOR (QUICK HEATER RELAY - AIR CONDITIONING AMPLIFIER ASSEMBLY)


    1. Remove the quick heater relay.

    2. Disconnect the F41 air conditioning amplifier assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      PTC HTR NO. 1-1 - 41-13 (PTC1) Always Below 1 Ω
      PTC HTR NO. 2-2 - F41-19 (PTC2) Always Below 1 Ω
      PTC HTR NO. 3-1 - F41-20 (PTC3) Always Below 1 Ω
      PTC HTR NO. 1-1 or F41-13 (PTC1) - Body ground Always 10 kΩ or higher
      PTC HTR NO. 2-2 or F41-19 (PTC2) - Body ground Always 10 kΩ or higher
      PTC HTR NO. 3-1 or F41-20 (PTC3) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. CHECK HARNESS AND CONNECTOR (QUICK HEATER RELAY - QUICK HEATER ASSEMBLY)


    1. Remove the quick heater relay.

    2. Disconnect the A44 quick heater assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      PTC HTR NO. 1-3 - A44-2 (B) Always Below 1 Ω
      PTC HTR NO. 2-5 - A44-3 (B) Always Below 1 Ω
      PTC HTR NO. 3-5 - A44-1 (B) Always Below 1 Ω
      PTC HTR NO. 1-3 or A44-2 (B) - Body ground Always 10 kΩ or higher
      PTC HTR NO. 2-5 or A44-3 (B) - Body ground Always 10 kΩ or higher
      PTC HTR NO. 3-5 or A44-1 (B) - Body ground Always 10 kΩ or higher

    OK

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR