AIR CONDITIONING SYSTEM Blower Motor Circuit

DESCRIPTION

The blower motor is operated by signals from the A/C amplifier. Blower motor speed signals are transmitted in accordance with changes in the duty ratio.

WIRING DIAGRAM


  1. w/o Solar Ventilation System

    A01JAZ8E01

  2. w/ Solar Ventilation System

    A01J9VKE01

INSPECTION PROCEDURE

Note

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

PROCEDURE


  1. PERFORM ACTIVE TEST USING INTELLIGENT TESTER


    1. Connect the intelligent tester to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the intelligent tester on.

    4. Enter the following menus: Body / Air Conditioner / Active Test.

    5. Check the operation by referring to the table below.

      Air Conditioner
      Tester Display Test Part Control Range Diagnostic Note
      Blower Motor Blower motor Min.: 0, Max.: 31 -
      OK
      Blower motor operates and blower motor speed level changes.
      Result
      Result Proceed to
      OK A

      NG (Blower motor does not operate)

      (w/o Solar ventilation system)

      		 B

      NG (Blower motor does not operate)

      (w/ Solar ventilation system)

      		 C

      NG (Blower motor operates but does not change speed)

      (w/o Solar ventilation system)

      		 D

      NG (Blower motor operates but does not change speed)

      (w/ Solar ventilation system)

      		 E

    B

    CHECK HARNESS AND CONNECTOR (BLOWER MOTOR - BODY GROUND) Click here

    C

    INSPECT SOLAR VENTILATION RELAY Click here

    D

    INSPECT A/C AMPLIFIER Click here

    E

    CHECK HARNESS AND CONNECTOR (BLOWER MOTOR - A/C AMPLIFIER) Click here

    A

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

  2. CHECK HARNESS AND CONNECTOR (BLOWER MOTOR - BODY GROUND)


    1. A01JBE2E26
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Blower Motor)

      Disconnect the blower motor connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      L33-1 (GND) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK HARNESS AND CONNECTOR (BLOWER MOTOR - BATTERY)


    1. A01JBE2E27
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Blower Motor)

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      L33-3 (+B) - Body ground Power switch off 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK HARNESS AND CONNECTOR (BLOWER MOTOR - A/C AMPLIFIER)


    1. A01JAUIE66

      Disconnect the A/C amplifier connector.

    2. A01JBE2E28
      Text in Illustration
      *1

      Front view of wire harness connector

      (to A/C Amplifier)
      *2

      Front view of wire harness connector

      (to Blower Motor)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      L17-23 (BLW) - L33-2 (SI) Always Below 1 Ω
      L17-23 (BLW) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. INSPECT BLOWER MOTOR


    1. Reconnect the blower motor connector.

    2. A01JAUIE67
      Text in Illustration
      *1

      Front view of wire harness connector

      (to A/C Amplifier)

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      L17-23 (BLW) - Body ground Power switch off 4.5 to 5.5 V

    NG

    REPLACE BLOWER MOTOR Click here

    OK

  6. INSPECT A/C AMPLIFIER


    1. A01JAGTE20
      Text in Illustration
      *1

      Component with harness connected

      (A/C Amplifier)

      Remove the A/C amplifier.

    2. Reconnect the A/C amplifier connector.

    3. Turn the power switch on (IG).

    4. Set the blower speed to LO.

    5. Measure the waveform between terminal L17-23 (BLW) of the A/C amplifier and body ground.

      Item Content
      Tool setting 1 V/DIV., 500 μs/DIV.
      Vehicle condition

      Power switch on (IG)

      Blower set to LO
      OK
      Waveform is as shown in the illustration.

      Tech Tips

      The waveform varies with the blower speed.


    NG

    REPLACE A/C AMPLIFIER Click here

    OK

    REPLACE BLOWER MOTOR Click here

  7. INSPECT SOLAR VENTILATION RELAY


    1. A01JCL8

      Remove the solar ventilation relay from the relay block No. 2-1.

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

      Standard Resistance
      Tester Connection Specified Condition
      3 - 5 10 kΩ or higher
      3 - 4 Below 1 Ω
      3 - 5

      Below 1 Ω

      (when battery voltage is applied to terminals 1 and 2)
      3 - 4

      10 kΩ or higher

      (when battery voltage is applied to terminals 1 and 2)

    NG

    REPLACE SOLAR VENTILATION RELAY

    OK

  8. CHECK HARNESS AND CONNECTOR (RELAY BLOCK NO. 2-1 - BATTERY)


    1. A01J8XIE01
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Relay Block No. 2-1)

      Disconnect the relay block No. 2-1 connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      L104-1 - Body ground Power switch off or on (ACC) Below 1 V
      L104-1 - Body ground Power switch on (IG) 11 to 14 V
      L104-5 - Body ground Always 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  9. CHECK HARNESS AND CONNECTOR (RELAY BLOCK NO. 2-1 - BODY GROUND)


    1. A01J8XIE01
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Relay Block No. 2-1)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      L104-2 - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  10. CHECK HARNESS AND CONNECTOR (BLOWER MOTOR - BODY GROUND)


    1. A01JBE2E26
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Blower Motor)

      Disconnect the blower motor connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      L33-1 (GND) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  11. CHECK HARNESS AND CONNECTOR (BLOWER MOTOR - BATTERY)


    1. Reinstall the solar ventilation relay to the relay block No. 2-1.

    2. A01JBE2E27
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Blower Motor)

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      L33-3 (+B) - Body ground Power switch off or on (ACC) Below 1 V
      L33-3 (+B) - Body ground Power switch on (IG) 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (BLOWER MOTOR - RELAY BLOCK NO. 2-1)

    OK

  12. CHECK HARNESS AND CONNECTOR (BLOWER MOTOR - A/C AMPLIFIER)


    1. A01JAUIE66

      Disconnect the A/C amplifier connector.

    2. A01JBH2E10

      Disconnect the solar ventilation ECU connector.

    3. A01JBE2E28
      Text in Illustration
      *1

      Front view of wire harness connector

      (to A/C Amplifier)
      *2

      Front view of wire harness connector

      (to Solar Ventilation ECU)
      *3

      Front view of wire harness connector

      (to Blower Motor)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      L17-23 (BLW) - L33-2 (SI) Always Below 1 Ω
      L17-23 (BLW) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  13. INSPECT BLOWER MOTOR


    1. Reconnect the blower motor connector.

    2. A01JAUIE67
      Text in Illustration
      *1

      Front view of wire harness connector

      (to A/C Amplifier)

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      L17-23 (BLW) - Body ground Power switch off or on (ACC) Below 1 V
      L17-23 (BLW) - Body ground Power switch on (IG) 4.5 to 5.5 V

    NG

    REPLACE BLOWER MOTOR Click here

    OK

  14. INSPECT A/C AMPLIFIER


    1. A01JAGTE20
      Text in Illustration
      *1

      Component with harness connected

      (A/C Amplifier)

      Remove the A/C amplifier.

    2. Reconnect the A/C amplifier connector.

    3. Turn the power switch on (IG).

    4. Set the blower speed to LO.

    5. Measure the waveform between terminal L17-23 (BLW) of the A/C amplifier and body ground.

      Item Content
      Tool setting 1 V/DIV., 500 μs/DIV.
      Vehicle condition

      Power switch on (IG)

      Blower set to LO
      OK
      Waveform is as shown in the illustration.

      Tech Tips

      The waveform varies with the blower speed.


    NG

    REPLACE A/C AMPLIFIER Click here

    OK

    REPLACE BLOWER MOTOR Click here