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

DTC Code DTC Name
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

E290773E02

CAUTION / NOTICE / HINT

Note:

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

PROCEDURE

  1. INSPECT RELAY (HTR)

    1. E185005

      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

    REPLACE RELAY (HTR)

  2. INSPECT BLOWER WITH FAN MOTOR SUB-ASSEMBLY

    1. E185008E03

      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

    REPLACE BLOWER WITH FAN MOTOR SUB-ASSEMBLY

    (Click here)

  3. INSPECT BLOWER RESISTOR

    1. E185643E01

      Remove the blower resistor (Click here).

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

      Standard Resistance

      Table 1. 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
      Table 2. 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
      Table 3. Text in Illustration

      *1

      for LHD

      *2

      for RHD

    REPLACE BLOWER RESISTOR

    (Click here)

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

    1. E185644E03

      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

    REPLACE HEATER CONTROL SUB-ASSEMBLY (BLOWER SWITCH)

    (Click here)

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

    1. U124052E02

      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
      Table 4. Text in Illustration

      *1

      Front view of wire harness connector

      (to Air Conditioning Amplifier Assembly)

    REPAIR OR REPLACE HARNESS OR CONNECTOR

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

    1. U123919E02

      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
      Table 5. Text in Illustration

      *1

      Front view of wire harness connector

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

    REPAIR OR REPLACE HARNESS OR CONNECTOR

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

    1. U123920E02

      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

      Table 6. 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
      Table 7. 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
      Table 8. 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

    REPAIR OR REPLACE HARNESS OR CONNECTOR

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

    1. Disconnect the H22 blower connector.

      E354530E01

    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

      Table 9. 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
      Table 10. 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
      Table 11. 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

    REPAIR OR REPLACE HARNESS OR CONNECTOR

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

    1. U123921E02

      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
      Table 12. Text in Illustration

      *1

      Front view of wire harness connector

      (to Blower with Fan Motor Sub-assembly)

    END

    REPAIR OR REPLACE HARNESS OR CONNECTOR