RM3660EC _58 Vehicle Interior _080733 HEATING / AIR CONDITIONING _0591215 AIR CONDITIONING SYSTEM(for Gasoline Model (NR Series) with Manual Air Conditioning System for Electrical Control Type) J

HEATING / AIR CONDITIONING  AIR CONDITIONING SYSTEM(for Gasoline Model (NR Series) with Manual Air Conditioning System for Electrical Control Type)  Blower Motor Circuit  


DESCRIPTION

The blower motor with fan sub-assembly is operated by signals from the air conditioning amplifier assembly. Blower motor speed signals are transmitted in accordance with changes in the duty ratio.

If the airflow volume is low or the blower speed cannot be changed, the following factors may be the cause.

Symptom Factor
Airflow volume cannot be changed
·

Air conditioning amplifier assembly malfunction

·

Blower motor with fan sub-assembly malfunction

·

Harness or connector



WIRING DIAGRAM

E332464E30
2.125,0.521 2.49,0.802 0.365,0.281 10 false 3 2.115,0.927 2.479,1.208 0.365,0.281 10 false 2 2.125,1.302 2.49,1.583 0.365,0.281 10 false 1 1.854,0.604 2.219,0.885 0.365,0.281 10 false +B 1.875,1 2.24,1.281 0.365,0.281 10 false SI 1.74,1.417 2.104,1.698 0.365,0.281 10 false GND 0.375,2.01 0.74,2.292 0.365,0.281 10 false A11 0.375,2.156 2.688,2.438 2.313,0.281 10 false Blower Motor with Fan Sub-assembly 4.677,1.875 5.042,2.156 0.365,0.281 10 false I49 4.667,2.021 7.063,2.313 2.396,0.292 10 false Air Conditioning Amplifier Assembly 4.896,1.302 5.26,1.583 0.365,0.281 10 false 17 4.896,0.896 5.26,1.177 0.365,0.281 10 false 21 5.115,0.917 5.719,1.156 0.604,0.24 10 false BLW 5.125,1.417 5.688,1.677 0.563,0.26 10 false GND 2.646,0.74 3.01,1.021 0.365,0.281 10 false HTR 3.688,0.594 5.073,0.802 1.385,0.208 10 false from Battery 6.135,0.99 6.74,1.229 0.604,0.24 10 false IC

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
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 motor with fan sub-assembly Min.: 0
Max.: 31 		-
Body Electrical > Air Conditioner > Active Test
Tester Display
Blower Motor
50004 121 2

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



A

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

B

5.INSPECT AIR CONDITIONING AMPLIFIER ASSEMBLY
2.CHECK HARNESS AND CONNECTOR (BLOWER MOTOR WITH FAN SUB-ASSEMBLY - POWER SOURCE AND BODY GROUND)
a.

Disconnect the A11 blower motor with fan sub-assembly connector.


b.

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

Standard Voltage:
Tester Connection Condition Specified Condition
A11-3 (+B) - Body ground Always 11 to 14 V


Standard Resistance:
Tester Connection Condition Specified Condition
A11-1 (GND) - Body ground Always Below 1 Ω



Result:
Proceed to
OK
NG



OK

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

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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

Disconnect the I49 air conditioning amplifier assembly connector.


b.

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

Standard Resistance:
Tester Connection Condition Specified Condition
A11-2 (SI) - I49-21 (BLW) Always Below 1 Ω
A11-2 (SI) or I49-21 (BLW) - Other terminals and body ground Always 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

4.INSPECT BLOWER MOTOR WITH FAN SUB-ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.INSPECT BLOWER MOTOR WITH FAN SUB-ASSEMBLY
E389752C01
1.5,0.333 1.948,0.594 0.448,0.26 1.146,2.885 1.5,2.26 true 1.625,0.385 2.083,0.583 0.458,0.198 10 false I49 0.958,2.938 1.417,3.135 0.458,0.198 10 false BLW 0.24,0.177 0.698,0.375 0.458,0.198 10 false *a
*a Front view of wire harness connector
(to Air Conditioning Amplifier Assembly)


a.

Connect the A11 blower motor with fan sub-assembly connector.


b.

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

Standard Voltage:
Tester Connection Condition Specified Condition
I49-21 (BLW) - Body ground Always 4.75 to 5.25 V



Result:
Proceed to
OK
NG



OK

5.INSPECT AIR CONDITIONING AMPLIFIER ASSEMBLY

NG

REPLACE BLOWER MOTOR WITH FAN SUB-ASSEMBLY

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


5.INSPECT AIR CONDITIONING AMPLIFIER ASSEMBLY
E389747C01
1.604,0.302 2.083,0.563 0.479,0.26 2.365,2.25 1.969,1.573 true 1.042,2.26 1.365,1.469 true 2.323,2.281 2.781,2.479 0.458,0.198 10 false BLW 0.885,2.302 1.344,2.5 0.458,0.198 10 false GND 1.74,0.365 2.198,0.563 0.458,0.198 10 false I49 2.823,3.74 3.281,3.938 0.458,0.198 10 false GND 0.156,0.135 0.615,0.333 0.458,0.198 10 false *a
*a Component with harness connected
(Air Conditioning Amplifier Assembly)


a.

Connect the I49 air conditioning amplifier assembly connector.


b.

Turn the ignition switch to ON.


c.

Set the blower speed to LO.


d.

Using an oscilloscope, check the waveform.

Item Content
Terminal No. I49-21 (BLW) - I49-17 (GND)
Tool Setting 2 V/DIV., 1 ms./DIV.
Condition
·

Ignition switch ON

·

Blower speed: LO



OK:

Waveform is similar to that shown in the illustration.


HINT:

The waveform varies with the blower speed.



Result:
Proceed to
OK
NG



OK

REPLACE BLOWER MOTOR WITH FAN 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