RM3660EC _58 Vehicle Interior _080733 HEATING / AIR CONDITIONING _0591216 AIR CONDITIONING SYSTEM(for Gasoline Model (NR Series) with Manual Air Conditioning System for Mechanical Control Type) J

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


DESCRIPTION

When the No. 2 heater control sub-assembly is operated, the HTR FR relay will turn on to allow current to flow to the blower motor and then the motor will start rotating. Operating the No. 2 heater control sub-assembly switches the current flow between the blower resistor and body ground, thus, shifting the rotation speed of the blower motor with fan sub-assembly.

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

Symptom Factor
·

Blower does not operate at all. (No air comes out.)

·

Blower airflow volume cannot be changed.

·

Blower airflow volume is continuously weak.

·

Blower airflow volume is sometimes weak.


·

HTR FR relay malfunction

·

Blower motor with fan sub-assembly malfunction

·

Blower resistor malfunction

·

No. 2 heater control sub-assembly malfunction

·

Air conditioning amplifier assembly malfunction

·

Harness or connector



WIRING DIAGRAM

E419674E01
0.26,0.469 1.896,0.677 1.635,0.208 10 false from IG1-NO. 1 Relay 0.823,1.063 2.458,1.271 1.635,0.208 10 false from Battery 2,0.635 3.021,0.833 1.021,0.198 10 false ECU-IG1 NO. 3 2.344,1.25 3.26,1.448 0.917,0.198 10 false HTR 3.177,1.552 4.25,1.781 1.073,0.229 10 false HTR FR Relay 6,0.5 6.917,0.698 0.917,0.198 10 false HR 6,1.052 6.917,1.25 0.917,0.198 10 false SBLW 5.49,1.323 6.406,1.521 0.917,0.198 10 false I162 5.49,1.479 7.125,1.917 1.635,0.438 10 false Air Conditioning Amplifier Assembly 3.531,2.115 4.448,2.313 0.917,0.198 10 false x1 3.531,2.292 4.729,2.76 1.198,0.469 10 false Blower Motor with Fan Sub-assembly 5.76,0.396 6.073,0.594 0.313,0.198 10 false 21 5.771,0.969 6.083,1.167 0.313,0.198 10 false 15 3.979,0.375 4.292,0.573 0.313,0.198 10 false 2 3.146,0.396 3.458,0.594 0.313,0.198 10 false 1 3.156,0.969 3.469,1.167 0.313,0.198 10 false 5 3.979,0.958 4.292,1.156 0.313,0.198 10 false 3 4.99,1.865 5.302,2.063 0.313,0.198 10 false 2 4.99,2.813 5.302,3.01 0.313,0.198 10 false 1 3.844,4.396 4.354,4.615 0.51,0.219 10 false E 4.427,4.396 4.938,4.615 0.51,0.219 10 false LO 5.052,4.396 5.563,4.615 0.51,0.219 10 false M1 5.688,4.396 6.198,4.615 0.51,0.219 10 false M2 6.354,4.396 6.865,4.615 0.51,0.219 10 false HI 3.271,5.979 3.781,6.198 0.51,0.219 10 false HI 3.24,5.583 3.75,5.802 0.51,0.219 10 false M2 3.24,5.188 3.75,5.406 0.51,0.219 10 false M1 3.26,4.792 3.771,5.01 0.51,0.219 10 false LO 3.219,4.594 3.729,4.813 0.51,0.219 10 false OFF 4.583,3.979 4.885,4.198 0.302,0.219 10 false 5 5.229,3.99 5.542,4.188 0.313,0.198 10 false 8 6.49,3.99 6.802,4.188 0.313,0.198 10 false 7 5.865,3.99 6.177,4.188 0.313,0.198 10 false 4 3.948,6.667 4.26,6.865 0.313,0.198 10 false 1 4.333,6.677 5.25,6.875 0.917,0.198 10 false I157 4.323,6.844 6.938,7.052 2.615,0.208 10 false No. 2 Heater Control Sub-assembly 1.927,4.646 2.656,4.844 0.729,0.198 10 false 2 1.438,3.531 2.167,3.729 0.729,0.198 10 false 4 1.458,6.01 2.188,6.208 0.729,0.198 10 false 1 1.938,5.219 2.667,5.417 0.729,0.198 10 false 3 1.448,3.75 1.958,3.969 0.51,0.219 10 false HI 1.635,5.219 2.146,5.438 0.51,0.219 10 false M1 1.646,4.646 2.156,4.865 0.51,0.219 10 false M2 1.469,5.771 1.979,5.99 0.51,0.219 10 false E 0.115,4.385 0.625,4.604 0.51,0.219 10 false I156 0.115,4.542 1.146,5.115 1.031,0.573 10 false Blower Resistor 3.156,1.208 3.469,1.406 0.313,0.198 10 false 4 4.99,2.094 5.302,2.292 0.313,0.198 10 false B 5,2.594 5.146,2.802 0.146,0.208 10 false L 4.625,6.208 5.76,6.427 1.135,0.219 10 false Blower Switch

CAUTION / NOTICE / HINT

NOTICE:

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


PROCEDURE

1.INSPECT HTR FR RELAY
a.

Inspect the HTR FR relay.

Click hereVehicle Interior>HEATING / AIR CONDITIONING>RELAY>ON-VEHICLE INSPECTION


Result:
Proceed to
OK
NG



OK

2.INSPECT BLOWER MOTOR WITH FAN SUB-ASSEMBLY

NG

REPLACE HTR FR RELAY

2.INSPECT BLOWER MOTOR WITH FAN SUB-ASSEMBLY
a.

Remove the blower motor with fan sub-assembly.

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


b.

Inspect the blower motor with fan sub-assembly.

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


Result:
Proceed to
OK
NG



OK

3.INSPECT BLOWER RESISTOR

NG

REPLACE BLOWER MOTOR WITH FAN SUB-ASSEMBLY

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


4.INSPECT NO. 2 HEATER CONTROL SUB-ASSEMBLY
a.

Remove the No. 2 heater control sub-assembly.

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


b.

Inspect the No. 2 heater control sub-assembly.

Click hereVehicle Interior>HEATING / AIR CONDITIONING>AIR CONDITIONING PANEL>INSPECTION


Result:
Proceed to
OK
NG



OK

5.CHECK HARNESS AND CONNECTOR (HTR FR RELAY - BATTERY AND BODY GROUND)

NG

REPLACE NO. 2 HEATER CONTROL SUB-ASSEMBLY

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


5.CHECK HARNESS AND CONNECTOR (HTR FR RELAY - BATTERY AND BODY GROUND)
a.

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

Standard Voltage:
Tester Connection Condition Specified Condition
5 (HTR FR relay) - Body ground Always 11 to 14 V
1 (HTR FR relay) - Body ground Ignition switch off Below 1 V
1 (HTR FR relay) - Body ground Ignition switch ON 11 to 14 V



b.

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

Standard Resistance:
Tester Connection Condition Specified Condition
4 (HTR FR relay) - Body ground Always Below 1 Ω



Result:
Proceed to
OK
NG



OK

6.CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER ASSEMBLY - HTR FR RELAY)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

6.CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER ASSEMBLY - HTR FR RELAY)
a.

Disconnect the I162 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
2 (HTR FR relay) - I162-21 (HR) Always Below 1 Ω
2 (HTR FR relay) or I162-21 (HR) - Other terminals and body ground Always 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

7.CHECK HARNESS AND CONNECTOR (NO. 2 HEATER CONTROL SUB-ASSEMBLY - AIR CONDITIONING AMPLIFIER ASSEMBLY)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

7.CHECK HARNESS AND CONNECTOR (NO. 2 HEATER CONTROL SUB-ASSEMBLY - AIR CONDITIONING AMPLIFIER ASSEMBLY)
a.

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

Standard Resistance:
Tester Connection Condition Specified Condition
I162-15 (SBLW) - I157-5 (LO) Always Below 1 Ω
I162-15 (SBLW) or I157-5 (LO) - Other terminals and body ground Always 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

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

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

8.CHECK HARNESS AND CONNECTOR (BLOWER RESISTOR - NO. 2 HEATER CONTROL SUB-ASSEMBLY AND BODY GROUND)
a.

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

Standard Resistance:
Tester Connection Condition Specified Condition
I156-4 (HI) - I157-7 (HI) Always Below 1 Ω
I156-2 (M2) - I157-4 (M2) Always Below 1 Ω
I156-3 (M1) - I157-8 (M1) Always Below 1 Ω
I156-1 (E) - Body ground Always Below 1 Ω
I156-4 (HI) or I157-7 (HI) - Other terminals and body ground Always 10 kΩ or higher
I156-2 (M2) or I157-4 (M2) - Other terminals and body ground Always 10 kΩ or higher
I156-3 (M1) or I157-8 (M1) - Other terminals and body ground Always 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

9.CHECK HARNESS AND CONNECTOR (NO. 2 HEATER CONTROL SUB-ASSEMBLY - BODY GROUND)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

9.CHECK HARNESS AND CONNECTOR (NO. 2 HEATER CONTROL SUB-ASSEMBLY - BODY GROUND)
a.

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

Standard Resistance:
Tester Connection Condition Specified Condition
I157-1 (E) - Body ground Always Below 1 Ω



Result:
Proceed to
OK
NG



OK

10.CHECK HARNESS AND CONNECTOR (BLOWER MOTOR WITH FAN SUB-ASSEMBLY - NO. 2 HEATER CONTROL SUB-ASSEMBLY)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

10.CHECK HARNESS AND CONNECTOR (BLOWER MOTOR WITH FAN SUB-ASSEMBLY - NO. 2 HEATER CONTROL SUB-ASSEMBLY)
a.

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

Standard Resistance:
Tester Connection Condition Specified Condition
x1-1 (L) - I157-7 (HI) Always Below 1 Ω
x1-1 (L) or I157-7 (HI) - Other terminals and body ground Always 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

11.CHECK HARNESS AND CONNECTOR (BLOWER MOTOR WITH FAN SUB-ASSEMBLY - HTR FR RELAY)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

11.CHECK HARNESS AND CONNECTOR (BLOWER MOTOR WITH FAN SUB-ASSEMBLY - HTR FR RELAY)
a.

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

Standard Resistance:
Tester Connection Condition Specified Condition
3 (HTR FR relay) - x1-2 (B) Always Below 1 Ω
3 (HTR FR relay) or x1-2 (B) - Other terminals and body ground Always 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

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


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR