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

for Preparation Click here


DESCRIPTION

When the No. 2 heater control (blower switch) is set to position 1 or higher, the contact of the HTR relay is closed, current flows to the blower motor, and the blower motor operates. The blower motor speed can be changed by exchanging the ground and the blower resistor circuit with the No. 2 heater control (blower switch).

WIRING DIAGRAM


E177084E01


INSPECTION PROCEDURE

NOTICE:
Inspect the fuses for circuits related to this system before performing the following inspection procedures.

1.INSPECT HTR RELAY


    E115946E02

  1. Remove the HTR relay.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    3 - 5
    		Voltage is not applied between terminals 1 and 2
    		10 kΩ or higher
    3 - 5
    		Apply the battery voltage between terminals 1 and 2
    		Below 1 Ω

  1. Reinstall the HTR relay.



NG
REPLACE HTR RELAY (Click here)
OK


2.INSPECT BLOWER MOTOR


    E181503E01

  1. Remove the blower motor (Click here).

  1. Apply battery voltage to the terminals and check that the blower motor operates.

    OK:
    Measurement Condition
    		Specified Condition
    Positive battery - 2
    Negative battery - 1
    		The blower motor operates smoothly.

  1. Reinstall the blower motor.

Text in Illustration 
*1
Component without harness connected
(Blower Motor)
*2
for LHD
*3
for RHD


NG
REPLACE BLOWER MOTOR (Click here)
OK


3.CHECK HARNESS AND CONNECTOR (HTR FUSE - HTR RELAY)


    E177670E01

  1. Remove the HTR Relay.

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    1 - Body ground
    		Ignition switch ON
    		11 to 14 V
    5 - Body ground
    		Always
    		11 to 14 V

  1. Reinstall the HTR Relay.

Text in Illustration 
*1
Front view of wire harness connector
(to HTR Relay)


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


4.CHECK HARNESS AND CONNECTOR (HTR RELAY - NO. 2 HEATER CONTROL SUB-ASSEMBLY)


    E120224E09

  1. Disconnect the D6 No. 2 heater control sub-assembly (blower switch) connector.

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    D6-9 (LO) - Body ground
    		Ignition switch ON
    		11 to 14 V

  1. Reconnect the No. 2 heater control sub-assembly (blower switch) connector.

Text in Illustration 
*1
Front view of wire harness connector
(to No. 2 Heater Control Sub-Assembly (Blower Switch))


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


5.CHECK HARNESS AND CONNECTOR (HTR RELAY - BLOWER MOTOR)


    E119793E08

  1. Disconnect the D14 blower motor connector.

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    D14-2 - Body ground
    		Ignition switch ON
    Blower switch on
    		11 to 14 V

  1. Reconnect the blower motor connector.

Text in Illustration 
*1
Front view of wire harness connector
(to Blower Motor)


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


6.CHECK HARNESS AND CONNECTOR (BLOWER RESISTOR - BLOWER MOTOR)


    E177671E01

  1. Disconnect the D13 blower resistor connector.

  1. Disconnect the D14 blower motor connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    D13-2(HI) - D14-1
    		Always
    		Below 1 Ω

  1. Reconnect the blower resistor connector.

  1. Reconnect the blower motor connector.

Text in Illustration 
*1
Front view of wire harness connector
(to Blower Resistor)
*2
Front view of wire harness connector
(to Blower Motor)


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


7.INSPECT BLOWER RESISTOR


    E177672E01

  1. Remove the blower resistor (Click here).

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    3 (E) - 2 (HI)
    		Always
    		3.01 to 3.47 Ω
    6 (M2) - 2 (HI)
    		Always
    		0.44 to 0.50 Ω
    1 (M1) - 2 (HI)
    		Always
    		1.53 to 1.75 Ω

  1. Reinstall the blower resistor.

Text in Illustration 
*1
Component without harness connected
(Blower Resistor)


NG
REPLACE BLOWER RESISTOR (Click here)
OK


8.INSPECT NO. 2 HEATER CONTROL SUB-ASSEMBLY (BLOWER SWITCH)


    E177089E01

  1. Remove the No. 2 heater control sub-assembly (blower switch) (Click here).

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

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    ALL - 5 (E)
    		0
    		10 kΩ or higher
    5 (E) - 9 (LO)
    		1
    		Below 1 Ω
    5 (E) - 7 (M1) - 9 (LO)
    		1 - 2
    		Below 1 Ω
    5 (E) - 7 (M1) - 9 (LO)
    		2
    		Below 1 Ω
    5 (E) - 6 (M2) - 7 (M1) - 9 (LO)
    		2 -3
    		Below 1 Ω
    5 (E) - 6 (M2) - 9 (LO)
    		3
    		Below 1 Ω
    5 (E) - 6 (M2) - 9 (LO) - 10 (HI)
    		3 - 4
    		Below 1 Ω
    5 (E) - 9 (LO) - 10 (HI)
    		4
    		Below 1 Ω

  1. Reinstall the No. 2 heater control sub-assembly (blower switch).

Text in Illustration 
*1
Component without harness connected
(No. 2 Heater Control Sub-Assembly (Blower Switch))


NG
REPLACE NO. 2 HEATER CONTROL SUB-ASSEMBLY (Click here)
OK


9.CHECK HARNESS AND CONNECTOR (NO. 2 HEATER CONTROL SUB-ASSEMBLY - BLOWER RESISTOR)


    E177673E01

  1. Disconnect the D6 No. 2 heater control sub-assembly (blower switch) connector.

  1. Disconnect the D13 blower resistor connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    D6-5 (E) - D13-3 (E)
    		Always
    		Below 1 Ω
    D6-6 (M2) - D13-6 (M2)
    		Always
    		Below 1 Ω
    D6-7 (M1) - D13-1 (M1)
    		Always
    		Below 1 Ω
    D6-10 (HI) - D13-2 (HI)
    		Always
    		Below 1 Ω

  1. Reconnect the No. 2 heater control sub-assembly (blower switch) connector.

  1. Reconnect the blower resistor connector.

Text in Illustration 
*1
Front view of wire harness connector
(to No. 2 Heater Control Sub-Assembly (blower switch))
*2
Front view of wire harness connector
(to Blower Resistor)


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPAIR OR REPLACE HARNESS OR CONNECTOR (BLOWER RESISTOR - BODY GROUND)