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

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

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

INSPECT RELAY (HTR)

CHECK HARNESS AND CONNECTOR (A/C AMPLIFIER - BATTERY)

INSPECT BLOWER MOTOR

INSPECT BLOWER RESISTOR

INSPECT NO. 2 HEATER CONTROL (BLOWER SWITCH)

CHECK HARNESS AND CONNECTOR (A/C AMPLIFIER - BATTERY)

CHECK HARNESS AND CONNECTOR (NO. 2 HEATER CONTROL (BLOWER SWITCH) - BATTERY)

CHECK HARNESS AND CONNECTOR (BLOWER RESISTOR - NO. 2 HEATER CONTROL (BLOWER SWITCH))

CHECK HARNESS AND CONNECTOR (BLOWER MOTOR - BLOWER RESISTOR, NO. 2 HEATER CONTROL)

CHECK HARNESS AND CONNECTOR (BLOWER MOTOR - BATTERY, BODY GROUND)

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


DESCRIPTION

When the No. 2 heater control (blower switch) is operated, the HTR relay will turn on and send current to operate the blower motor. Operating the No. 2 heater control (blower switch) adjusts the flow of current between the blower resistor and body ground, thus, adjusting the speed of the blower motor.

WIRING DIAGRAM


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


Corolla. Zre142 Aze141.Heating Air Conditioning.Air Conditioning System (For Automatic Air Conditioning System).Air Conditioning System (For Manual 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.INSPECT RELAY (HTR)


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

  1. Remove the HTR relay from the instrument panel junction block.

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

    Standard Resistance:
    Tester Connection
    		Specified Condition
    3 - 4
    		Below 1 Ω
    3 - 4
    		10 kΩ or higher (When battery voltage is applied to terminals 1 and 2)
    3 - 5
    		10 kΩ or higher
    3 - 5
    		Below 1 Ω (When battery voltage is applied to terminals 1 and 2)


NG
REPLACE RELAY (HTR)
OK


2.CHECK HARNESS AND CONNECTOR (A/C AMPLIFIER - BATTERY)


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

  1. Disconnect the connector from the A/C amplifier.

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

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    E62-9 (SBLW) - Body ground*1
    		Ignition switch ON
    Blower switch: OFF
    		11 to 14 V
    E62-9 (SBLW) - Body ground*1
    		Ignition switch ON
    Blower switch: ON
    		Below 1 V
    E111-21 (SBLW) - Body ground*2
    		Ignition switch ON
    Blower switch: OFF
    		11 to 14 V
    E111-21 (SBLW) - Body ground*2
    		Ignition switch ON
    Blower switch: ON
    		Below 1 V
    1. *1: except TMC Made 2AZ-FE
    2. *2: for TMC Made and except TMC Made 2ZR-FE
    Text in Illustration
    *a
    		Front view of wire harness connector
    (to A/C Amplifier (except TMC Made 2AZ-FE))
    *b
    		Front view of wire harness connector
    (to A/C Amplifier (for TMC Made and except TMC Made 2ZR-FE))


NG
Go to step 3
OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE (COROLLA_ZRE142 RM000001M2W05PX.html)

3.INSPECT BLOWER MOTOR

  1. Remove the blower motor.



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

  1. Disconnect the connector from the blower motor.

  1. Connect a positive (+) lead from the battery to terminal 2 and a negative (-) lead from the battery to terminal 1, and check that the motor operates.

    OK:
    The blower motor operates smoothly.
    Text in Illustration
    *a
    		Component without harness connected
    (Blower Motor)


NG
REPLACE BLOWER MOTOR (COROLLA_ZRE142 RM000002XU901AX.html)
OK


4.INSPECT BLOWER RESISTOR

  1. Remove the blower resistor.



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

  1. Disconnect the connector from the blower resistor.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    E66-1 (HI) - E66-4 (E)
    		Always
    		3.12 to 3.60 Ω
    E66-1 (HI) - E66-2 (M1)
    		Always
    		1.45 to 1.67 Ω
    E66-1 (HI) - E66-3 (M2)
    		Always
    		0.52 to 0.60 Ω
    Text in Illustration
    *a
    		Component without harness connected
    (Blower Resister)


NG
REPLACE BLOWER RESISTOR (COROLLA_ZRE142 RM000002XU3019X.html)
OK


5.INSPECT NO. 2 HEATER CONTROL (BLOWER SWITCH)

  1. Remove the No. 2 heater control (blower switch).



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

  1. Disconnect the connector from the No. 2 heater control (blower switch).

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

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    E70-4 (LO), E70-6 (HI), E70-9 (M1), E70-10 (M2) - E70-5 (E)
    		Blower switch: OFF
    		10 kΩ or higher
    E70-4 (LO) - E70-5 (E)
    		Blower switch: LO
    		Below 1 Ω
    E70-4 (LO), E70-9 (M1) - E70-5 (E)
    		Blower switch: M1
    		Below 1 Ω
    E70-4 (LO), E70-10 (M2) - E70-5 (E)
    		Blower switch: M2
    		Below 1 Ω
    E70-4 (LO), E70-6 (HI) - E70-5 (E)
    		Blower switch: HI
    		Below 1 Ω
    Text in Illustration
    *a
    		Component without harness connected
    (No. 2 Heater Control (Blower Switch))


NG
REPLACE NO. 2 HEATER CONTROL (BLOWER SWITCH) (COROLLA_ZRE142 RM000002XM300XX.html)
OK


6.CHECK HARNESS AND CONNECTOR (A/C AMPLIFIER - BATTERY)


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

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    E62-9 (SBLW) - Body ground*1
    		Ignition switch ON
    		11 to 14 V
    E62-9 (SBLW) - Body ground*1
    		Ignition switch off
    		Below 1 V
    E111-21 (SBLW) - Body ground*2
    		Ignition switch ON
    		11 to 14 V
    E111-21 (SBLW) - Body ground*2
    		Ignition switch off
    		Below 1 V
    1. *1: except TMC Made 2AZ-FE
    2. *2: for TMC Made and except TMC Made 2ZR-FE
    Text in Illustration
    *a
    		Front view of wire harness connector
    (to A/C Amplifier (except TMC Made 2AZ-FE))
    *b
    		Front view of wire harness connector
    (to A/C Amplifier (for TMC Made and except TMC Made 2ZR-FE))


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


7.CHECK HARNESS AND CONNECTOR (NO. 2 HEATER CONTROL (BLOWER SWITCH) - BATTERY)


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

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    E70-4 (LO) - Body ground
    		Ignition switch ON
    		11 to 14 V
    E70-4 (LO) - Body ground
    		Ignition switch off
    		Below 1 V
    Text in Illustration
    *a
    		Front view of wire harness connector
    (to No. 2 Heater Control (Blower Switch))


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


8.CHECK HARNESS AND CONNECTOR (BLOWER RESISTOR - NO. 2 HEATER CONTROL (BLOWER SWITCH))

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    E66-1 (HI) - E70-6 (HI)
    		Always
    		Below 1 Ω
    E66-3 (M2) - E70-10 (M2)
    		Always
    		Below 1 Ω
    E66-2 (M1) - E70-9 (M1)
    		Always
    		Below 1 Ω
    E66-4 (E) - Body ground
    		Always
    		Below 1 Ω
    E70-5 (E) - Body ground
    		Always
    		Below 1 Ω
    E66-1 (HI) - Body ground
    		Always
    		10 kΩ or higher
    E66-3 (M2) - Body ground
    		Always
    		10 kΩ or higher
    E66-2 (M1) - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


9.CHECK HARNESS AND CONNECTOR (BLOWER MOTOR - BLOWER RESISTOR, NO. 2 HEATER CONTROL)

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    E64-1 - E66-1 (HI)
    		Always
    		Below 1 Ω
    E64-1 - E70-6 (HI)
    		Always
    		Below 1 Ω
    E64-1 - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


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

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

  1. Reconnect the connector to the blower resistor.

  1. Reconnect the connector to the No. 2 heater control (blower switch).



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

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    E64-2 - Body ground
    		Ignition switch ON
    Blower switch: OFF
    		Below 1 V
    E64-2 - Body ground
    		Ignition switch ON
    Blower switch: ON
    		11 to 14 V

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

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    E64-2 - Body ground
    		Ignition switch off
    Blower switch: OFF
    		Below 1 Ω
    Text in Illustration
    *a
    		Front view of wire harness connector
    (to Blower Motor)


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE AIR CONDITIONING AMPLIFIER (COROLLA_ZRE142 RM000002XMC01VX.html)