Air Conditioning System (For Automatic Air Conditioning System) Blower Motor Circuit

Vehicle Interior. Corolla. Zre142 Aze141
Heating Air Conditioning. Corolla. Zre142 Aze141

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

PERFORM ACTIVE TEST USING TECHSTREAM

CHECK HARNESS AND CONNECTOR (BLOWER MOTOR - BODY GROUND)

CHECK HARNESS AND CONNECTOR (BLOWER MOTOR - BATTERY)

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

INSPECT BLOWER MOTOR

INSPECT AIR CONDITIONING AMPLIFIER

AIR CONDITIONING SYSTEM (for Automatic 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


Corolla. Zre142 Aze141.Heating Air Conditioning.Air Conditioning System (For Automatic Air Conditioning System).Air Conditioning System (For Automatic Air Conditioning System) Blower Motor Circuit


INSPECTION PROCEDURE

NOTICE:
Inspect the fuses for circuits related to this system before performing the following inspection procedure.
1.PERFORM ACTIVE TEST USING TECHSTREAM

  1. Connect the Techstream to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the Techstream on.

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

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


Air Conditioner
Tester Display
Test Part
Control Range
Diagnostic Note
Blower Motor
(Blower Motor)
Blower motor
Min.: 0, Max.: 31
-

Result:

Result
Proceed to
OK
A
NG (blower motor does not operate)
B
NG (blower motor operates but does not change speed)
C


B
Go to step 2

C
Go to step 6
A

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE (COROLLA_ZRE142 RM000001M2W05OX.html)

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


    Corolla. Zre142 Aze141.Heating Air Conditioning.Air Conditioning System (For Automatic Air Conditioning System).Air Conditioning System (For Automatic Air Conditioning System) Blower Motor Circuit

  1. Disconnect the blower motor connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    E23-1 (GND) - Body ground
    		Always
    		Below 1 Ω
    Text in Illustration
    *a
    		Front view of wire harness connector
    (to Blower Motor)


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


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


    Corolla. Zre142 Aze141.Heating Air Conditioning.Air Conditioning System (For Automatic Air Conditioning System).Air Conditioning System (For Automatic Air Conditioning System) Blower Motor Circuit

  1. Disconnect the blower motor connector.

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

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    E23-3 (+B) - Body ground
    		Always
    		11 to 14 V
    Text in Illustration
    *a
    		Front view of wire harness connector
    (to Blower Motor)


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


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

  1. Disconnect the A/C amplifier connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    E23-2 (SI) - E30-23 (BLW)
    		Always
    		Below 1 Ω
    E23-2 (SI) - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


5.INSPECT BLOWER MOTOR

  1. Reconnect the connector to the blower motor.



    Corolla. Zre142 Aze141.Heating Air Conditioning.Air Conditioning System (For Automatic Air Conditioning System).Air Conditioning System (For Automatic Air Conditioning System) Blower Motor Circuit

  1. Measure the voltage on the A/C amplifier connector side according to the value(s) in the table below.

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    E30-23 (BLW) - Body ground
    		Ignition switch ON
    		4.5 to 5.5 V
    Text in Illustration
    *a
    		Front view of wire harness connector
    (to A/C Amplifier)


NG
REPLACE BLOWER MOTOR (COROLLA_ZRE142 RM000002XU901AX.html)
OK


6.INSPECT AIR CONDITIONING AMPLIFIER

  1. Remove the A/C amplifier.



    Corolla. Zre142 Aze141.Heating Air Conditioning.Air Conditioning System (For Automatic Air Conditioning System).Air Conditioning System (For Automatic Air Conditioning System) Blower Motor Circuit

  1. Reconnect the connector to the A/C amplifier.



    Corolla. Zre142 Aze141.Heating Air Conditioning.Air Conditioning System (For Automatic Air Conditioning System).Air Conditioning System (For Automatic Air Conditioning System) Blower Motor Circuit

  1. Turn the ignition switch to ON.

  1. Turn the blower switch on.

  1. Measure the waveform between terminal E30-23 (BLW) of the A/C amplifier and body ground.

    Item
    		Content
    Tool setting
    		1 V/DIV., 500 μs./DIV.
    Vehicle condition
    		Ignition switch ON
    Blower switch: ON
    OK:
    Waveform is as shown in the illustration.
    HINT:
    Waveform varies with the blower level.
    Text in Illustration
    *a
    		Component with harness connected
    (A/C Amplifier)


NG
REPLACE AIR CONDITIONING AMPLIFIER (COROLLA_ZRE142 RM000002XMC01VX.html)
OK

REPLACE BLOWER MOTOR (COROLLA_ZRE142 RM000002XU901AX.html)