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)  Heater Control Switch Circuit  


DESCRIPTION

The No. 3 heater control sub-assembly is powered through the ECU-IG1 No. 4 fuse. The No. 3 heater control sub-assembly transmits operational signals of each switch to the air conditioning amplifier assembly.

Symptom Factor
·

A/C switch indicator is abnormal

·

Hot air does not come out even though temperature control switch set to MAX HOT

·

Idle up not performed even though temperature control switch set to MAX COOL


·

No. 3 heater control sub-assembly malfunction

·

Air conditioning amplifier assembly malfunction

·

Harness or connector



WIRING DIAGRAM

E419746E08
2.99,1.802 3.75,2 0.76,0.198 10 false A/C Switch 2.646,3.375 3.729,3.583 1.083,0.208 10 false MAX HOT Switch 2.542,4.927 3.76,5.146 1.219,0.219 10 false MAX COOL Switch 4.927,6.073 7.115,6.292 2.188,0.219 10 false Air Conditioning Amplifier Assembly 4.927,5.917 5.26,6.115 0.333,0.198 10 false I162 4.417,5.552 4.854,5.75 0.438,0.198 10 false AIND 4.354,5.208 4.792,5.406 0.438,0.198 10 false MAXC 4.344,3.635 4.781,3.833 0.438,0.198 10 false MAXH 5.667,2.177 5.958,2.375 0.292,0.198 10 false A/C 1.771,6.188 4,6.417 2.229,0.229 10 false No. 3 Heater Control Sub-assembly 1.781,6.021 2.115,6.219 0.333,0.198 10 false I159 0.885,2.073 1.24,2.271 0.354,0.198 10 false IG+ 0.677,2.073 0.875,2.25 0.198,0.177 10 false 1 0.74,0.479 1.76,0.677 1.021,0.198 10 false ECU-IG1 NO. 4 2.115,0.323 3.563,0.542 1.448,0.219 10 false from IG1- NO. 1 Relay 4.521,2.083 4.865,2.281 0.344,0.198 10 false A/C 5.667,3.729 6.083,3.917 0.417,0.188 10 false HEAT 5.656,5.292 6.073,5.479 0.417,0.188 10 false COOL 5.406,5.208 5.625,5.406 0.219,0.198 10 false 31 4.865,5.208 5.083,5.406 0.219,0.198 10 false 7 4.865,5.563 5.083,5.76 0.219,0.198 10 false 4 5.479,5.563 5.698,5.76 0.219,0.198 10 false 4 4.865,3.635 5.094,3.833 0.229,0.198 10 false 2 5.417,3.646 5.635,3.844 0.219,0.198 10 false 30 5.417,2.083 5.635,2.281 0.219,0.198 10 false 32 4.854,2.083 5.073,2.281 0.219,0.198 10 false 8 5.667,5.656 6.083,5.844 0.417,0.188 10 false LED 3.115,1.333 3.458,1.531 0.344,0.198 10 false OFF 3.167,1.573 3.51,1.771 0.344,0.198 10 false ON 3.646,1.094 3.99,1.292 0.344,0.198 10 false IG+ 4.104,1.094 4.448,1.292 0.344,0.198 10 false A/C 3.146,2.896 3.49,3.094 0.344,0.198 10 false OFF 3.156,3.135 3.5,3.333 0.344,0.198 10 false ON 3.635,2.656 3.979,2.854 0.344,0.198 10 false IG+ 4.042,2.667 4.521,2.865 0.479,0.198 10 false MAXH 4.031,4.219 4.51,4.417 0.479,0.198 10 false MAXC 3.646,4.219 3.99,4.417 0.344,0.198 10 false IG+ 3.135,4.458 3.479,4.656 0.344,0.198 10 false OFF 3.146,4.698 3.49,4.896 0.344,0.198 10 false ON

CAUTION / NOTICE / HINT

NOTICE:

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


PROCEDURE

1.INSPECT NO. 3 HEATER CONTROL SUB-ASSEMBLY
a.

Remove the No. 3 heater control sub-assembly.

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


b.

Inspect the No. 3 heater control sub-assembly.

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


Result:
Proceed to
OK
NG



OK

2.CHECK HARNESS AND CONNECTOR (NO. 3 HEATER CONTROL SUB-ASSEMBLY - IG POWER SOURCE)

NG

REPLACE NO. 3 HEATER CONTROL SUB-ASSEMBLY

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


2.CHECK HARNESS AND CONNECTOR (NO. 3 HEATER CONTROL SUB-ASSEMBLY - IG POWER SOURCE)
a.

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

Standard Voltage:
Tester Connection Condition Specified Condition
I159-1 (IG+) - Body ground Ignition switch on (IG) 11 to 14 V
I159-1 (IG+) - Body ground Ignition switch off Below 1 V



Result:
Proceed to
OK
NG



OK

3.CONFIRM SYMPTOM

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.CONFIRM SYMPTOM
a.

Choose the problem to be inspected.


Result:
Result Proceed to
A/C switch indicator is abnormal A
Hot air does not come out even though temperature control switch set to MAX HOT B
Idle up not performed even though temperature control switch set to MAX COOL C



A

4.CHECK HARNESS AND CONNECTOR (NO. 3 HEATER CONTROL SUB-ASSEMBLY - AIR CONDITIONING AMPLIFIER ASSEMBLY)

B

5.CHECK HARNESS AND CONNECTOR (NO. 3 HEATER CONTROL SUB-ASSEMBLY - AIR CONDITIONING AMPLIFIER ASSEMBLY)

C

6.CHECK HARNESS AND CONNECTOR (NO. 3 HEATER CONTROL SUB-ASSEMBLY - AIR CONDITIONING AMPLIFIER ASSEMBLY)
4.CHECK HARNESS AND CONNECTOR (NO. 3 HEATER CONTROL SUB-ASSEMBLY - AIR CONDITIONING AMPLIFIER ASSEMBLY)
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
I159-8 (A/C) - I162-32 (A/C) Always Below 1 Ω
I159-4 (AIND) - I162-4 (LED) Always Below 1 Ω
I159-8 (A/C) or I162-32 (A/C) - Other terminals and body ground Always 10 kΩ or higher
I159-4 (AIND) or I162-4 (LED) - 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

5.CHECK HARNESS AND CONNECTOR (NO. 3 HEATER CONTROL SUB-ASSEMBLY - AIR CONDITIONING AMPLIFIER ASSEMBLY)
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
I159-2 (MAXH) - I162-30 (HEAT) Always Below 1 Ω
I159-2 (MAXH) or I162-30 (HEAT) - 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

6.CHECK HARNESS AND CONNECTOR (NO. 3 HEATER CONTROL SUB-ASSEMBLY - AIR CONDITIONING AMPLIFIER ASSEMBLY)
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
I159-7 (MAXC) - I162-31 (COOL) Always Below 1 Ω
I159-7 (MAXC) or I162-31 (COOL) - 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