RM38N0EC _58 Vehicle Interior _111841 HEATING / AIR CONDITIONING _0499788 AIR CONDITIONING SYSTEM(for Gasoline Model) J

HEATING / AIR CONDITIONING  AIR CONDITIONING SYSTEM(for Gasoline Model)  Blower Motor Circuit  


DESCRIPTION

The blower motor with fan sub-assembly is operated by signals from the air conditioning amplifier assembly.

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

E432291E08
5.125,0.875 5.583,1.073 0.458,0.198 10 false BLW 4.771,0.813 5.229,1.01 0.458,0.198 10 false 21 5.135,1.469 5.594,1.667 0.458,0.198 10 false GND 4.76,1.26 5.219,1.458 0.458,0.198 10 false 17 6.135,1 6.594,1.198 0.458,0.198 10 false IC 2.625,0.74 3.083,0.938 0.458,0.198 10 false HTR 3.677,0.438 4.531,0.896 0.854,0.458 10 false from INP STD NO. 1-2 Fuse 1.854,0.615 2.313,0.813 0.458,0.198 10 false +B 2.135,0.521 2.594,0.719 0.458,0.198 10 false 3 1.875,1.01 2.333,1.208 0.458,0.198 10 false SI 2.135,0.896 2.594,1.094 0.458,0.198 10 false 2 2.125,1.281 2.583,1.479 0.458,0.198 10 false 1 1.729,1.406 2.188,1.604 0.458,0.198 10 false GND 0.292,2 0.75,2.198 0.458,0.198 10 false E18 0.302,2.167 2.875,2.417 2.573,0.25 10 false Blower Motor with Fan Sub-assembly 4.729,1.469 5.188,1.667 0.458,0.198 10 false E44 4.74,2.01 7.115,2.229 2.375,0.219 10 false Air Conditioning Amplifier Assembly 4.719,1.01 5.177,1.208 0.458,0.198 10 false E44

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.

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 Level This test activates the Blower Motor to adjust the air volume High/Low.
(Blower motor with fan sub-assembly) 		0: Air Volume Low
31: Air Volume High 		Operate with ignition switch ON.
Body Electrical > Air Conditioner > Active Test
Tester Display
Blower Level
50004 450 1

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 - AUXILIARY BATTERY AND BODY GROUND)

B

5.CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY
2.CHECK HARNESS AND CONNECTOR (BLOWER MOTOR WITH FAN SUB-ASSEMBLY - AUXILIARY BATTERY AND BODY GROUND)
a.
E432377C03
1.479,0.188 1.979,0.438 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 0.615,0.75 0.927,0.948 0.313,0.198 10 false +B 2.646,0.75 3.031,0.958 0.385,0.208 10 false GND 1.604,0.229 1.917,0.427 0.313,0.198 10 false E18
*a Rear view of wire harness connector
(to Blower Motor with Fan Sub-assembly)


Disconnect the E18 blower motor with fan sub-assembly connector.


b.

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

Standard Resistance:
Tester Connection Condition Specified Condition

Click Location & Routing(E18)Location & Routing

Click Connector(E18)Instrument Panel>Instrument Panel Wire / Radio Wiring Sub-Assy / Telephone Computer Wire>Blower Motor with Fan Sub-Assembly

E18-1 (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

Click Location & Routing(E18)Location & Routing

Click Connector(E18)Instrument Panel>Instrument Panel Wire / Radio Wiring Sub-Assy / Telephone Computer Wire>Blower Motor with Fan Sub-Assembly

E18-3 (+B) - Body ground Ignition switch off 11 to 14 V



Result:
Proceed to
OK
NG



OK

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

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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

Disconnect the E44 air conditioning amplifier assembly connector.


b.

Disconnect the E18 blower motor with fan sub-assembly connector.


c.

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

Standard Resistance:
Tester Connection Condition Specified Condition

Click Location & Routing(E44,E18)Location & Routing

Click Connector(E44)Instrument Panel>Instrument Panel Wire / Radio Wiring Sub-Assy / Telephone Computer Wire>Air Conditioning Amplifier Assembly

Click Connector(E18)Instrument Panel>Instrument Panel Wire / Radio Wiring Sub-Assy / Telephone Computer Wire>Blower Motor with Fan Sub-Assembly

E44-21 (BLW) - E18-2 (SI) Always Below 1 Ω
E44-21 (BLW) or E18-2 (SI) - Other terminals and body ground Always 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

4.CHECK BLOWER MOTOR WITH FAN SUB-ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.CHECK BLOWER MOTOR WITH FAN SUB-ASSEMBLY
a.

Connect the E18 blower motor with fan sub-assembly connector.


b.

Disconnect the E44 air conditioning amplifier assembly connector.


c.

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

Standard Voltage:
Tester Connection Condition Specified Condition

Click Location & Routing(E44)Location & Routing

Click Connector(E44)Instrument Panel>Instrument Panel Wire / Radio Wiring Sub-Assy / Telephone Computer Wire>Air Conditioning Amplifier Assembly

E44-21 (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 MOTOR WITH FAN SUB-ASSEMBLY

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


5.CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY
a.

Connect the E44 air conditioning amplifier assembly connector.


b.

Using an oscilloscope, check the waveform.

w/o Seat Heater System:
E445220C01
3.719,0.115 4.135,0.375 0.417,0.26 4.323,1.771 4.104,1.188 true 3.188,1.771 3.375,1.063 true 3.813,0.177 4.271,0.375 0.458,0.198 10 false E44 3.26,0.063 3.573,0.26 0.313,0.198 10 false *a 4.677,2.979 5.135,3.177 0.458,0.198 10 false GND 4.229,1.813 4.688,2.01 0.458,0.198 10 false BLW 3.063,1.813 3.521,2.01 0.458,0.198 10 false GND
*a Component with harness connected
(Air Conditioning Amplifier Assembly) 		- -


w/ Seat Heater System:
E432379C02
5.146,0.135 5.563,0.396 0.417,0.26 5.854,1.969 5.521,1.208 true 4.969,1.969 4.802,1.063 true 5.25,0.198 5.708,0.396 0.458,0.198 10 false E44 4.635,0.156 4.948,0.354 0.313,0.198 10 false *a 4.677,2.979 5.135,3.177 0.458,0.198 10 false GND 5.75,2 6.208,2.198 0.458,0.198 10 false BLW 4.844,2.01 5.302,2.208 0.458,0.198 10 false GND
*a Component with harness connected
(Air Conditioning Amplifier Assembly) 		- -


Item Content
Terminal No. E44-21 (BLW) - E44-17 (GND)
Tool Setting 2 V/DIV., 1 ms./DIV.
Condition
·

Ignition switch ON

·

Blower speed: 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 MOTOR WITH FAN SUB-ASSEMBLY

Click hereVehicle Interior>HEATING / AIR CONDITIONING>BLOWER UNIT>DISASSEMBLY


NG

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

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