AIR CONDITIONING SYSTEM(for Manual Air Conditioning System) Viscous Heater with Magnet Clutch Circuit

DESCRIPTION

When the idle up switch is pushed, the air conditioning amplifier assembly turns on the viscous heater relay and operates the viscous heater. If the viscous heater does not operate when the idle up switch is pushed, there may be a problem in the circuit shown below.

WIRING DIAGRAM

A01X4M6E01

PROCEDURE


  1. READ VALUE USING GTS (IDLE UP/PWR HEATER SWITCH)


    1. Use the Data List to check if the idle up switch is functioning properly Click here.

      Air Conditioner
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      IDLE UP/PWR HEAT Switch Idle up switch / ON or OFF

      ON: Idle up switch on

      OFF: Idle up switch off

      		 -
      OK
      The display is as specified in the normal condition column.

    NG

    CHECK HARNESS AND CONNECTOR (IDLE UP SWITCH - BATTERY AND BODY GROUND) Click here

    OK

  2. PERFORM GTS (VISCOUS HEATER)


    1. Select the Active Test, use the GTS to generate a control command, and then check that the viscous heater relay (VICS HTR) Click here.

      Tester Display Test Part Control Range Diagnostic Note
      Viscous Heater Viscous heater relay ON / OFF -
      OK
      Viscous heater relay operates using GTS.

    OK

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    NG

    INSPECT VISCOUS HEATER RELAY (VICS HTR RELAY) Click here

  3. CHECK HARNESS AND CONNECTOR (IDLE UP SWITCH - BATTERY AND BODY GROUND)


    1. A01X13RE01
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Idle Up Switch)

      Disconnect the idle up switch assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      E97-3 (E) - Body ground Always Below 1 Ω

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      E97-2 (IND+) - Body ground Ignition switch off Below 1 V
      E97-2 (IND+) - Body ground Ignition switch ON 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. INSPECT IDLE UP SWITCH


    1. Remove the idle up switch Click here.

    2. Inspect the idle up switch Click here.


    NG

    REPLACE IDLE UP SWITCH Click here

    OK

  5. CHECK HARNESS AND CONNECTOR (IDLE UP SWITCH - AIR CONDITIONING AMPLIFIER ASSEMBLY)


    1. Disconnect the E81 air conditioning amplifier assembly connector.

    2. Disconnect the E97 idle up switch connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      E81-4 (SW 1) - E97-6 (+S) Always Below 1 Ω
      E81-4 (SW 1) or E97-6 (+S) - Body ground Always 10 kΩ or higher

    OK

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    OK

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  6. INSPECT VISCOUS HEATER RELAY (VICS HTR RELAY)


    1. Remove the viscous heater relay (VICS HTR) from the No. 1 engine room relay block.

    2. Inspect the viscous heater relay (VICS HTR) Click here.


    NG

    REPLACE VISCOUS HEATER RELAY

    OK

  7. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER ASSEMBLY - BATTERY)


    1. A01XAENE01
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to Air Conditioning Amplifier Assembly)

      Disconnect the air conditioning amplifier assembly connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      E81-17 (MGCA) - Body ground Ignition switch off Below 1 V
      E81-17 (MGCA) - Body ground Ignition switch ON 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  8. CHECK HARNESS AND CONNECTOR (VISCOUS HEATER RELAY - VISCOUS WITH MAGNET CLUTCH HEATER ASSEMBLY AND BATTERY)


    • *1: for LHD

    • *2: for RHD


    1. Disconnect the 1Q, 1Y*1 or 1K*2 No. 1 engine room relay block connector.

    2. Disconnect the C98 viscous with magnet clutch heater assembly connector

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      1Q-2 - C98- (MG+) Always Below 1 Ω
      1Q-2 or C98- (MG+ - Body ground Always 10 kΩ or higher

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

        Standard Voltage
        for LHD
        Tester Connection Condition Specified Condition
        1Y-1 - Body ground Always 11 to 14 V
        1Q-3 - Body ground Ignition switch off Below 1 V
        1Q-3 - Body ground Ignition switch ON 11 to 14 V
        for RHD
        Tester Connection Condition Specified Condition
        1K-1 - Body ground Always 11 to 14 V
        1Q-3 - Body ground Ignition switch off Below 1 V
        1Q-3 - Body ground Ignition switch ON 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  9. CHECK VISCOUS WITH MAGNET CLUTCH HEATER ASSEMBLY


    1. Replace the viscous with magnet clutch heater assembly with a new or known good one Click here.

    2. Check that the air conditioning system is operated normally.

      OK
      Air conditioning system is operated normally.

    OK

    END (VISCOUS WITH MAGNET CLUTCH HEATER ASSEMBLY WAS DEFECTIVE)

    NG

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here