AIR CONDITIONING SYSTEM(for Manual Air Conditioning System) Blower Motor Circuit

DESCRIPTION

When the No. 2 heater control sub-assembly (blower switch) is set to position 1 or higher, the contact of the heater blower motor relay assembly (HTR relay) relay is closed, current flows to the blower motor, and the blower motor operates. The blower motor speed can be changed by exchanging the ground and the blower resistor circuit with the No. 2 heater control sub-assembly (blower switch).

WIRING DIAGRAM

A01VF3NE04

CAUTION / NOTICE / HINT

Note

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

PROCEDURE


  1. INSPECT HEATER BLOWER MOTOR RELAY ASSEMBLY (HTR RELAY)


    1. Inspect the heater blower motor relay assembly (HTR relay) Click here.


    NG

    REPLACE HEATER BLOWER MOTOR RELAY ASSEMBLY (HTR RELAY)

    OK

  2. INSPECT BLOWER MOTOR WITH FAN SUB-ASSEMBLY


    1. Inspect the blower motor with fan sub-assembly Click here.


    NG

    REPLACE BLOWER MOTOR WITH FAN SUB-ASSEMBLY Click here

    OK

  3. CHECK HARNESS AND CONNECTOR (HEATER BLOWER MOTOR RELAY ASSEMBLY (HTR RELAY) - BATTERY, IG1 NO. 1 RELAY AND BODY GROUND)


    1. A01VGEWE01
      Text in Illustration
      *1 Heater Blower Motor Relay Assembly (HTR Relay) Holder

      Remove the heater blower motor relay assembly (HTR relay).

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      HTR-5 - Body ground Always 11 to 14 V
      HTR-1 - Body ground Ignition switch ON 11 to 14 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      HTR-4 - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK HARNESS AND CONNECTOR (HEATER BLOWER MOTOR RELAY ASSEMBLY (HTR RELAY) - AIR CONDITIONING AMPLIFIER ASSEMBLY)


    1. Remove the heater blower motor relay assembly (HTR 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
      HTR-2 - F41-14 (HR) Always Below 1 Ω
      HTR-2 - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. CHECK HARNESS AND CONNECTOR (NO. 2 HEATER CONTROL SUB-ASSEMBLY (BLOWER SWITCH) - AIR CONDITIONING AMPLIFIER ASSEMBLY)


    1. Disconnect the F39 No. 2 heater control sub-assembly (blower switch) connector.

    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
      F39-9 (LO) - F41-17 (SBLW) Always Below 1 Ω
      F39-9 (LO) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. CHECK HARNESS AND CONNECTOR (BLOWER MOTOR WITH FAN SUB-ASSEMBLY - HEATER BLOWER MOTOR RELAY ASSEMBLY (HTR RELAY))

    A01VJ79E02
    Text in Illustration
    *a

    Front view of wire harness connector

    (to Blower Motor with Fan Sub-Assembly)

    1. Disconnect the F35 blower motor with fan sub-assembly connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      F35-2 - Body ground

      Ignition switch ON

      Blower switch ON

      		 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  7. CHECK HARNESS AND CONNECTOR (BLOWER MOTOR WITH FAN SUB-ASSEMBLY - BLOWER RESISTOR)


    1. Disconnect the F35 blower motor with fan sub-assembly connector.

    2. Disconnect the F34 blower resistor connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F35-1 - F34-4 (HI) Always Below 1 Ω
      F35-1 - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  8. INSPECT BLOWER RESISTOR


    1. Inspect the blower resistor Click here.


    NG

    REPLACE BLOWER RESISTOR Click here

    OK

  9. INSPECT NO. 2 HEATER CONTROL SUB-ASSEMBLY (BLOWER SWITCH)


    1. Inspect the No. 2 heater control sub-assembly (blower switch) Click here.


    NG

    REPLACE NO. 2 HEATER CONTROL SUB-ASSEMBLY (BLOWER SWITCH) Click here

    OK

  10. CHECK HARNESS AND CONNECTOR (NO. 2 HEATER CONTROL SUB-ASSEMBLY (BLOWER SWITCH) - BLOWER RESISTOR AND BODY GROUND)


    1. Disconnect the F39 No. 2 heater control sub-assembly (blower switch) connector.

    2. Disconnect the F34 blower resistor connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F39-5 (E) - F34-1 (E) Always Below 1 Ω
      F39-6 (M2) - F34-2 (M2) Always Below 1 Ω
      F39-7 (M1) - F34-3 (M1) Always Below 1 Ω
      F39-10 (HI) - F34-4 (HI) Always Below 1 Ω
      F39-5 (E) - Body ground Always Below 1 Ω
      F39-6 (M2) - Body ground Always 10 kΩ or higher
      F39-7 (M1) - Body ground Always 10 kΩ or higher
      F39-10 (HI) - Body ground Always 10 kΩ or higher

    OK

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

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR