AIR CONDITIONING SYSTEM Blower Motor Circuit

DTC Code DTC Name
Blower Motor Circuit

DESCRIPTION

E252330E01

The blower with fan motor sub-assembly operates according to signals from the air conditioning amplifier assembly. The blower with fan motor sub-assembly speed signals are transmitted by changes in the duty ratio.

Duty Ratio:

The duty ratio is the ratio of the blower with fan motor sub-assembly on time (T1) to the total of the blower with fan motor sub-assembly on and off time (T2).

The air conditioning amplifier assembly controls the blower with fan motor sub-assembly speed.

WIRING DIAGRAM

E198319E09

CAUTION / NOTICE / HINT

Note:

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

PROCEDURE

  1. PERFORM ACTIVE TEST USING INTELLIGENT TESTER (BLOWER WITH FAN MOTOR)

    1. Select the Active Test, use the intelligent tester to generate a control command, and then check that the blower with fan motor sub-assembly operates

      Click here

      Body Electrical > Air Conditioner > Active Test

      Tester Display

      Measurement Item

      Control Range

      Diagnostic Note

      Blower Motor

      Blower with fan motor sub-assembly

      Min.: 0, Max.: 31

      -

      OK

      Blower with fan motor sub-assembly operates and blower motor speed changes.

    Result

    Result

    OK

    NG
    OK

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

    Click here

    NG

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

    1. E167100C01

      *a

      Front view of wire harness connector

      (to Blower with Fan Motor Sub-assembly)

      Disconnect the G14 motor connector.

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

      Standard Voltage

      Tester Connection

      Condition

      Specified Condition

      G14-3 (+B) - Body ground

      Always

      11 to 14 V

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      G14-1 (GND) - Body ground

      Always

      Below 1 Ω

    Result

    Result

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - BLOWER WITH FAN MOTOR AND BODY GROUND)

    1. Disconnect the G13 amplifier connector.

    2. Disconnect the G14 motor connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      G13-23 (BLW) - G14-2 (SI)

      Always

      Below 1 Ω

      G13-23 (BLW) - Body ground

      Always

      10 kΩ or higher

      G13-14 (GND) - Body ground

      Always

      Below 1 Ω

    Result

    Result

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY (BLW SIGNAL)

    1. E166805C01

      *a

      Component with harness connected

      (Air Conditioning Amplifier Assembly)

      Remove the air conditioning amplifier assembly with its connectors still connected

      Click here

    2. Using an oscilloscope, check the waveform.

      Table 1. Measurement Condition

      Item

      Content

      Terminal No. (Symbol)

      G13-23 (BLW) - G13-14 (GND)

      Tool Setting

      1 V/DIV., 500 μs/DIV.

      Condition

      Engine switch on (IG)Blower switch LO

      OK

      Waveform is as shown in the illustration.

      Tip:

      Waveform varies with the blower level.

    Result

    Result

    OK

    NG
    NG

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

    Click here

    OK

  5. REPLACE BLOWER WITH FAN MOTOR SUB-ASSEMBLY

    1. Replace the blower with fan motor sub-assembly with a new or normally functioning one

      Click here

    2. Operate the blower with fan motor sub-assembly to check that it functions properly.

      OK

      Blower with fan motor sub-assembly operates normally.

    Result

    Result

    OK

    NG
    OK

    END (BLOWER WITH FAN MOTOR SUB-ASSEMBLY IS FAULTY)

    NG

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

    Click here