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

DESCRIPTION

When the heater control sub-assembly is operated, the Heater relay will turn on to allow current to flow to the blower motor and then the motor will start rotating. Operating the heater control sub-assembly switches the current flow between the blower resistor and body ground, thus, shifting the operating speed of the blower motor.

WIRING DIAGRAM

A004KRWE02

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


    1. Remove the heater blower motor relay.

    2. Inspect the heater blower motor relay Click here.


    NG

    REPLACE HEATER BLOWER MOTOR RELAY

    OK

  2. INSPECT BLOWER MOTOR WITH FAN SUB-ASSEMBLY


    1. Disconnect the A31 blower motor with fan sub-assembly connector.

    2. 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 - BLOWER MOTOR WITH FAN SUB-ASSEMBLY)


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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A65-3 - A31-2 Always Below 1 Ω
      A65-3 - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. INSPECT HEATER CONTROL SUB-ASSEMBLY


    1. Remove the heater control sub-assembly Click here.

    2. Inspect the heater control sub-assembly Click here.


    NG

    REPLACE HEATER CONTROL SUB-ASSEMBLY Click here

    OK

  5. CHECK HARNESS AND CONNECTOR (HEATER BLOWER MOTOR RELAY - HEATER CONTROL SUB-ASSEMBLY)


    1. Disconnect the D23 heater control sub-assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A65-2 - D23-10 Always Below 1 Ω
      A65-2 - 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 CONTROL SUB-ASSEMBLY)


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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A31-1 - D23-1 Always Below 1 Ω
      A31-1 - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  7. CHECK HARNESS AND CONNECTOR (HEATER CONTROL SUB-ASSEMBLY - BODY GROUND)


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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D23-5(E) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  8. INSPECT BLOWER RESISTOR


    1. Remove the blower resister Click here.

    2. Inspect the blower resistor Click here.


    NG

    REPLACE BLOWER RESISTOR Click here

    OK

  9. CHECK HARNESS OR CONNECTOR (HEATER CONTROL SUB-ASSEMBLY - BLOWER RESISTOR)


    1. Disconnect the A26 blower resister connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D23-3(M&M1) - A26-2(M&M1) Always Below 1 Ω
      D23-6(M2) - A26-3(M2) Always Below 1 Ω
      D23-3(M&M1) - Body ground Always 10 kΩ or higher
      D23-6(M2) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  10. CHECK HARNESS OR CONNECTOR (BLOWER MOTOR WITH FAN SUB-ASSEMBLY - BLOWER RESISTOR)


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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A31-1 - A26-1(H) Always Below 1 Ω
      A31-1 - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  11. CHECK HARNESS AND CONNECTOR (BLOWER RESISTOR - BODY GROUND)


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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A26-4(L) - Body ground Always Below 1 Ω

    OK

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

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR