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

DESCRIPTION

When the heater control sub-assembly (blower switch) is operated, the HTR relay will turn on to allow current to flow to the blower with fan motor sub-assembly and then the motor will start rotating. Operating the heater control sub-assembly (blower switch) changes the current flow between the blower resistor and body ground, which changes the rotation speed of the blower with fan motor sub-assembly.

WIRING DIAGRAM

A01INS4E02

INSPECTION PROCEDURE

Note

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

PROCEDURE


  1. INSPECT RELAY (HTR)


    1. A01IU0L

      Remove the HTR relay from the instrument panel junction block.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      3 - 4 Battery voltage is not applied to terminals 1 and 2 Below 1 Ω
      3 - 4 Battery voltage is applied to terminals 1 and 2 10 kΩ or higher
      3 - 5 Battery voltage is not applied to terminals 1 and 2 10 kΩ or higher
      3 - 5 Battery voltage is applied to terminals 1 and 2 Below 1 Ω

    NG

    REPLACE RELAY (HTR)

    OK

  2. INSPECT BLOWER WITH FAN MOTOR SUB-ASSEMBLY


    1. A01IT2IE01

      Remove the blower with fan motor sub-assembly Click here.

    2. Apply battery voltage to the blower with fan motor sub-assembly and check the operation of the blower with fan motor sub-assembly.

      OK
      Measurement Condition Specified Condition

      Battery positive (+) → Terminal 2

      Battery negative (-) → Terminal 1

      		 Blower with fan motor sub-assembly operation is normal

    NG

    REPLACE BLOWER WITH FAN MOTOR SUB-ASSEMBLY Click here

    OK

  3. INSPECT BLOWER RESISTOR


    1. A01INURE01
      Text in Illustration
      *1 for LHD
      *2 for RHD

      Remove the blower resistor Click here.

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      1 (HI) - 4 (E) Always 3.12 to 3.60 Ω
      3 (M2) - 1 (HI) Always 0.52 to 0.60 Ω
      2 (M1) - 1 (HI) Always 1.45 to 1.67 Ω
      for RHD
      Tester Connection Condition Specified Condition
      4 (HI) - 1 (E) Always 3.12 to 3.60 Ω
      2 (M2) - 4 (HI) Always 0.52 to 0.60 Ω
      3 (M1) - 4 (HI) Always 1.45 to 1.67 Ω

    NG

    REPLACE BLOWER RESISTOR Click here

    OK

  4. INSPECT HEATER CONTROL SUB-ASSEMBLY (BLOWER SWITCH)


    1. A01IQ8UE01

      Remove the 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
      4 (LO), 6 (HI), 9 (M1) or 10 (M2) - 5 (E) Blower switch OFF 10 kΩ or higher
      4 (LO) - 5 (E) Blower switch LO Below 1 Ω
      4 (LO) or 9 (M1) - 5 (E) Blower switch M1 Below 1 Ω
      4 (LO) or 10 (M2) - 5 (E) Blower switch M2 Below 1 Ω
      4 (LO) or 6 (HI) - 5 (E) Blower switch HI Below 1 Ω

    NG

    REPLACE HEATER CONTROL SUB-ASSEMBLY (BLOWER SWITCH) Click here

    OK

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


    1. A01ITOPE02
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Air Conditioning Amplifier Assembly)

      Disconnect the H118 amplifier connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      H118-14 (HR) - Body ground

      Ignition switch ON

      Blower switch LO

      		 Below 1 V
      H118-14 (HR) - Body ground

      Ignition switch ON

      Blower switch OFF

      		 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. CHECK HARNESS AND CONNECTOR (HEATER CONTROL [BLOWER SWITCH] - BATTERY)


    1. A01IMZHE01
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Heater Control Sub-assembly [Blower Switch])

      Disconnect the H65 heater control connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      H65-4 (LO) - Body ground Ignition switch ON 11 to 14 V
      H65-4 (LO) - Body ground Ignition switch off Below 1 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  7. CHECK HARNESS AND CONNECTOR (BLOWER RESISTOR - HEATER CONTROL [BLOWER SWITCH])


    1. A01IPTTE01
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Blower Resistor)
      *2

      Front view of wire harness connector

      (to Heater Control Sub-assembly [Blower Switch])
      *3 for LHD
      *4 for RHD

      Disconnect the H24 resistor connector.

    2. Disconnect the H65 heater control connector.

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      H24-1 (HI) - H65-6 (HI) Always Below 1 Ω
      H24-3 (M2) - H65-10 (M2) Always Below 1 Ω
      H24-2 (M1) - H65-9 (M1) Always Below 1 Ω
      H24-4 (E) - Body ground Always Below 1 Ω
      H65-5 (E) - Body ground Always Below 1 Ω
      H24-1 (HI) - Body ground Always 10 kΩ or higher
      H24-3 (M2) - Body ground Always 10 kΩ or higher
      H24-2 (M1) - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      H24-4 (HI) - H65-6 (HI) Always Below 1 Ω
      H24-2 (M2) - H65-10 (M2) Always Below 1 Ω
      H24-3 (M1) - H65-9 (M1) Always Below 1 Ω
      H24-1 (E) - Body ground Always Below 1 Ω
      H65-5 (E) - Body ground Always Below 1 Ω
      H24-4 (HI) - Body ground Always 10 kΩ or higher
      H24-2 (M2) - Body ground Always 10 kΩ or higher
      H24-3 (M1) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  8. CHECK HARNESS AND CONNECTOR (BLOWER WITH FAN MOTOR - BLOWER RESISTOR AND HEATER CONTROL [BLOWER SWITCH])


    1. A01IT4HE16
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Blower with Fan Motor Sub-assembly)
      *2

      Front view of wire harness connector

      (to Blower Resistor)
      *3

      Front view of wire harness connector

      (to Heater Control Sub-assembly [Blower Switch])
      *4 for LHD
      *5 for RHD

      Disconnect the H22 blower connector.

    2. Disconnect the H24 resistor connector.

    3. Disconnect the H65 heater control connector.

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      H22-1 - H24-1 (HI) Always Below 1 Ω
      H22-1 - H65-6 (HI) Always Below 1 Ω
      H22-1 - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      H22-1 - H24-4 (HI) Always Below 1 Ω
      H22-1 - H65-6 (HI) Always Below 1 Ω
      H22-1 - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  9. CHECK HARNESS AND CONNECTOR (BLOWER WITH FAN MOTOR - BATTERY)


    1. A01IR3EE01
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Blower with Fan Motor Sub-assembly)

      Disconnect the H22 blower connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      H22-2 - Body ground

      Ignition switch ON

      Blower switch off

      		 Below 1 V
      H22-2 - Body ground

      Ignition switch ON

      Blower switch on

      		 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    END