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

DESCRIPTION

When the No. 2 heater control (blower switch) is set to position 1 or higher, the contact of the HTR 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 (blower switch).

WIRING DIAGRAM

A0118X0E01

INSPECTION PROCEDURE

Note

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

PROCEDURE


  1. INSPECT HTR RELAY


    1. A01195NE02

      Remove the HTR relay.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      3 - 5 Voltage is not applied between terminals 1 and 2 10 kΩ or higher
      3 - 5 Apply the battery voltage between terminals 1 and 2 Below 1 Ω

    3. Reinstall the HTR relay.


    NG

    REPLACE HTR RELAY Click here

    OK

  2. INSPECT BLOWER MOTOR


    1. A011AD2E01
      Text in Illustration
      *1

      Component without harness connected

      (Blower Motor)
      *2 for LHD
      *3 for RHD

      Remove the blower motor Click here.

    2. Apply battery voltage to the terminals and check that the blower motor operates.

      OK
      Measurement Condition Specified Condition

      Positive battery - 2

      Negative battery - 1

      		 The blower motor operates smoothly.

    3. Reinstall the blower motor.


    NG

    REPLACE BLOWER MOTOR Click here

    OK

  3. CHECK HARNESS AND CONNECTOR (HTR FUSE - HTR RELAY)


    1. A0117NZE01
      Text in Illustration
      *1

      Front view of wire harness connector

      (to HTR Relay)

      Remove the HTR Relay.

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

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

    3. Reinstall the HTR Relay.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK HARNESS AND CONNECTOR (HTR RELAY - NO. 2 HEATER CONTROL SUB-ASSEMBLY)


    1. A0117ZQE09
      Text in Illustration
      *1

      Front view of wire harness connector

      (to No. 2 Heater Control Sub-Assembly (Blower Switch))

      Disconnect the D6 No. 2 heater control sub-assembly (blower switch) connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      D6-9 (LO) - Body ground Ignition switch ON 11 to 14 V

    3. Reconnect the No. 2 heater control sub-assembly (blower switch) connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. CHECK HARNESS AND CONNECTOR (HTR RELAY - BLOWER MOTOR)


    1. A01196XE08
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Blower Motor)

      Disconnect the D14 blower motor connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      D14-2 - Body ground

      Ignition switch ON

      Blower switch on

      		 11 to 14 V

    3. Reconnect the blower motor connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. CHECK HARNESS AND CONNECTOR (BLOWER RESISTOR - BLOWER MOTOR)


    1. A011813E01
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Blower Resistor)
      *2

      Front view of wire harness connector

      (to Blower Motor)

      Disconnect the D13 blower resistor connector.

    2. Disconnect the D14 blower motor connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D13-2(HI) - D14-1 Always Below 1 Ω

    4. Reconnect the blower resistor connector.

    5. Reconnect the blower motor connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  7. INSPECT BLOWER RESISTOR


    1. A0118JIE01
      Text in Illustration
      *1

      Component without harness connected

      (Blower Resistor)

      Remove the blower resistor Click here.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      3 (E) - 2 (HI) Always 3.01 to 3.47 Ω
      6 (M2) - 2 (HI) Always 0.44 to 0.50 Ω
      1 (M1) - 2 (HI) Always 1.53 to 1.75 Ω

    3. Reinstall the blower resistor.


    NG

    REPLACE BLOWER RESISTOR Click here

    OK

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


    1. A011ASIE01
      Text in Illustration
      *1

      Component without harness connected

      (No. 2 Heater Control Sub-Assembly (Blower Switch))

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

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      ALL - 5 (E) 0 10 kΩ or higher
      5 (E) - 9 (LO) 1 Below 1 Ω
      5 (E) - 7 (M1) - 9 (LO) 1 - 2 Below 1 Ω
      5 (E) - 7 (M1) - 9 (LO) 2 Below 1 Ω
      5 (E) - 6 (M2) - 7 (M1) - 9 (LO) 2 -3 Below 1 Ω
      5 (E) - 6 (M2) - 9 (LO) 3 Below 1 Ω
      5 (E) - 6 (M2) - 9 (LO) - 10 (HI) 3 - 4 Below 1 Ω
      5 (E) - 9 (LO) - 10 (HI) 4 Below 1 Ω

    3. Reinstall the No. 2 heater control sub-assembly (blower switch).


    NG

    REPLACE NO. 2 HEATER CONTROL SUB-ASSEMBLY Click here

    OK

  9. CHECK HARNESS AND CONNECTOR (NO. 2 HEATER CONTROL SUB-ASSEMBLY - BLOWER RESISTOR)


    1. A0119HTE01
      Text in Illustration
      *1

      Front view of wire harness connector

      (to No. 2 Heater Control Sub-Assembly (blower switch))
      *2

      Front view of wire harness connector

      (to Blower Resistor)

      Disconnect the D6 No. 2 heater control sub-assembly (blower switch) connector.

    2. Disconnect the D13 blower resistor connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D6-5 (E) - D13-3 (E) Always Below 1 Ω
      D6-6 (M2) - D13-6 (M2) Always Below 1 Ω
      D6-7 (M1) - D13-1 (M1) Always Below 1 Ω
      D6-10 (HI) - D13-2 (HI) Always Below 1 Ω

    4. Reconnect the No. 2 heater control sub-assembly (blower switch) connector.

    5. Reconnect the blower resistor connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPAIR OR REPLACE HARNESS OR CONNECTOR (BLOWER RESISTOR - BODY GROUND)