RM35X0E _58 Vehicle Interior _079316 HEATING / AIR CONDITIONING _0386651 AIR CONDITIONING SYSTEM(for Automatic Air Conditioning System) J

HEATING / AIR CONDITIONING  AIR CONDITIONING SYSTEM(for Automatic Air Conditioning System)  Blower Motor Circuit  


DESCRIPTION

The blower with fan motor sub-assembly reads the signal from the air conditioning amplifier assembly and controls operation and speed changes of the blower motor.

If the blower air volume is weak, or there are any other blower malfunctions such as the temperature or air volume cannot be changed, the following causes are possible.

Malfunction Status Factor
·

Blower airflow volume is weak.

·

Blower airflow volume cannot be changed.


·

Air conditioning amplifier assembly malfunction

·

Blower with fan motor sub-assembly malfunction

·

Evaporator or heater core fin clogging

·

Clean air filter clogging



WIRING DIAGRAM

E316644E25
5.167,0.75 5.625,0.948 0.458,0.198 10 false BLW 4.885,0.75 5.344,0.948 0.458,0.198 10 false 21 5.177,1.521 5.635,1.719 0.458,0.198 10 false GND 4.896,1.406 5.354,1.604 0.458,0.198 10 false 17 6.073,0.875 6.531,1.073 0.458,0.198 10 false IC 2.438,0.615 3.135,0.813 0.698,0.198 10 false HTR FR 3.615,0.469 4.979,0.677 1.365,0.208 10 false from Battery 1.219,0.875 1.677,1.073 0.458,0.198 10 false IC 1.833,0.365 2.292,0.563 0.458,0.198 10 false +B 2.125,0.365 2.583,0.563 0.458,0.198 10 false 3 1.854,0.76 2.313,0.958 0.458,0.198 10 false SI 2.125,0.75 2.583,0.948 0.458,0.198 10 false 2 2.125,1.156 2.583,1.354 0.458,0.198 10 false 1 1.688,1.156 2.146,1.354 0.458,0.198 10 false GND 0.292,1.927 0.75,2.125 0.458,0.198 10 false N71 0.292,2.094 2.865,2.344 2.573,0.25 10 false Blower with Fan Motor Sub-assembly 4.667,1.958 5.125,2.156 0.458,0.198 10 false N42 4.667,2.104 7.042,2.323 2.375,0.219 10 false Air Conditioning Amplifier Assembly

CAUTION / NOTICE / HINT

NOTICE:

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


PROCEDURE

1.PERFORM ACTIVE TEST USING GTS (BLOWER MOTOR)
a.

Connect the GTS to the DLC3.


b.

Turn the ignition switch to ON.


c.

Turn the GTS on.


d.

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


e.

Perform the Active Test according to the display on the GTS.

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 		-
Body Electrical > Air Conditioner > Active Test
Tester Display
Blower Motor
50004 121 2

Result:
Result Proceed to
Blower with fan motor sub-assembly does not operate A
Blower with fan motor sub-assembly operates but does not change speed B



A

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

B

5.CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY
2.CHECK HARNESS AND CONNECTOR (BLOWER WITH FAN MOTOR SUB-ASSEMBLY - BATTERY AND BODY GROUND)
a.
E366620C04
0.333,1.083 0.833,1.333 0.5,0.25 2.083,1.167 2.333,0.833 2.333,0.833 2.583,0.833 true 1.333,1.167 1.083,0.833 1.083,0.833 0.833,0.833 true 0.083,0.063 0.396,0.26 0.313,0.198 10 false *a 0.635,0.74 0.948,0.938 0.313,0.198 10 false +B 2.646,0.75 3.031,0.958 0.385,0.208 10 false GND 0.458,1.125 0.771,1.323 0.313,0.198 10 false N71
*a Rear view of wire harness connector
(to Blower with Fan Motor Sub-assembly)


Disconnect the blower with fan motor sub-assembly connector.


b.

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

Standard Resistance:
Tester Connection Condition Specified Condition
N71-1 (GND) - Body ground Always Below 1 Ω



c.

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

Standard Voltage:
Tester Connection Condition Specified Condition
N71-3 (+B) - Body ground Always 11 to 14 V



Result:
Proceed to
OK
NG



OK

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

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER ASSEMBLY - BLOWER WITH FAN MOTOR SUB-ASSEMBLY)
a.

Disconnect the N42 air conditioning amplifier assembly connector.


b.

Disconnect the N71 blower with fan motor sub-assembly connector.


c.

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

Standard Resistance:
Tester Connection Condition Specified Condition
N42-21 (BLW) - N71-2 (SI) Always Below 1 Ω
N42-21 (BLW) or N71-2 (SI) - Other terminals and body ground Always 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

4.CHECK BLOWER WITH FAN MOTOR SUB-ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.CHECK BLOWER WITH FAN MOTOR SUB-ASSEMBLY
a.
E407119C03
0.25,0.917 0.75,1.167 0.5,0.25 1.563,1.302 1.396,1.802 1.396,1.802 1.146,1.802 true 0.365,0.958 0.823,1.156 0.458,0.198 10 false N42 0.823,1.74 1.208,1.906 0.385,0.167 10 false BLW 0.063,0.031 0.521,0.229 0.458,0.198 10 false *a
*a Front view of wire harness connector
(to Air Conditioning Amplifier Assembly)


Disconnect the air conditioning amplifier assembly connector.


b.

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

Standard Voltage:
Tester Connection Condition Specified Condition
N42-21 (BLW) - Body ground Always 4.75 to 5.25 V



Result:
Proceed to
OK
NG



OK

5.CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY

NG

REPLACE BLOWER WITH FAN MOTOR SUB-ASSEMBLY

Click hereVehicle Interior>HEATING / AIR CONDITIONING>FRONT BLOWER MOTOR>REMOVAL


5.CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY
a.
E349843C08
0.646,0.781 1.146,1.031 0.5,0.25 1.75,0.969 2,1.385 2,1.385 2.25,1.385 true 0.771,0.823 1.229,1.021 0.458,0.198 10 false N71 2.302,1.292 2.76,1.49 0.458,0.198 10 false SI 2.875,2.833 3.229,3.042 0.354,0.208 10 false GND 0.073,0.052 0.531,0.25 0.458,0.198 10 false *a
*a Component with harness connected
(Blower with Fan Motor Sub-assembly)


Using the oscilloscope, check for the waveform.

Item Content
Terminal No. N71-2 (SI) - Body ground
Tool Setting 1 V/DIV., 500 μs./DIV.
Vehicle Condition
·

Ignition switch ON

·

Blower switch: LO



HINT:

The waveform varies with the blower speed.


OK:

Waveform is similar to that shown in the illustration.



Result:
Proceed to
OK
NG



OK

REPLACE BLOWER WITH FAN MOTOR SUB-ASSEMBLY

Click hereVehicle Interior>HEATING / AIR CONDITIONING>FRONT BLOWER MOTOR>REMOVAL


NG

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

Click hereVehicle Interior>HEATING / AIR CONDITIONING>AIR CONDITIONING AMPLIFIER>REMOVAL