RM3090E _58 Vehicle Interior _008789 HEATING / AIR CONDITIONING _0049189 AIR CONDITIONING SYSTEM(for Manual Air Conditioning System) J

HEATING / AIR CONDITIONING  AIR CONDITIONING SYSTEM(for Manual Air Conditioning System)  Heater Control Switch Circuit  


DESCRIPTION

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

WIRING DIAGRAM

E273612E01
2.354,0.677 3.25,0.885 0.896,0.208 10 false A/C Switch 0.615,1.125 1.802,1.344 1.188,0.219 10 false Max Hot Position 2.188,1.042 2.594,1.24 0.406,0.198 10 false Free 2.198,1.302 2.604,1.5 0.406,0.198 10 false Lock 0.729,1.521 1.135,1.719 0.406,0.198 10 false Off 0.729,1.76 1.135,1.958 0.406,0.198 10 false On 3.469,1.792 3.635,1.979 0.167,0.188 10 false B 3.677,1.594 3.844,1.781 0.167,0.188 10 false 2 3.333,2.229 3.698,2.417 0.365,0.188 10 false A/C 3.677,2 3.844,2.188 0.167,0.188 10 false 3 3.26,3.979 3.667,4.156 0.406,0.177 10 false AIND 3.688,3.74 3.854,3.927 0.167,0.188 10 false 4 3.469,4.406 3.635,4.594 0.167,0.188 10 false B 3.479,4.813 3.646,5 0.167,0.188 10 false E 3.688,4.177 3.854,4.365 0.167,0.188 10 false 7 3.688,4.583 3.854,4.771 0.167,0.188 10 false 8 0.99,5.354 3.396,5.583 2.406,0.229 10 false No. 3 Heater Control Sub-assembly 0.979,5.156 1.385,5.333 0.406,0.177 10 false G23 5.635,2 5.802,2.188 0.167,0.188 10 false 2 5.854,2.115 6.229,2.313 0.375,0.198 10 false A/C 4.333,1.365 4.833,1.563 0.5,0.198 10 false HTR-IG 5.354,1.188 6.865,1.406 1.51,0.219 10 false from IG1 NO.1 Relay 5.865,3.865 6.271,4.073 0.406,0.208 10 false LED 5.573,3.74 5.792,3.948 0.219,0.208 10 false 12 5.875,4.698 6.354,4.917 0.479,0.219 10 false HEAT 5.656,4.583 5.875,4.792 0.219,0.208 10 false 3 5.719,5.198 6.198,5.417 0.479,0.219 10 false G80 5.719,5.417 7.063,5.854 1.344,0.438 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.INSPECT NO. 3 HEATER CONTROL SUB-ASSEMBLY
a.
E269933C01
2.115,1.229 2.25,0.635 2.25,0.635 2.5,0.635 true 1.958,1.344 2.01,1.74 2.01,1.74 2.26,1.74 true 1.792,1.344 1.615,1.74 1.615,1.74 1.448,1.74 true 1.781,3.146 2.313,2.333 2.313,2.333 2.563,2.333 true 1.302,1.219 1.438,0.625 1.438,0.625 1.688,0.625 true 1.146,1.344 0.865,1.604 0.865,1.604 0.698,1.604 true 1.99,3.469 2.542,3.656 2.542,3.656 2.792,3.656 true 1.406,3.479 0.948,3.885 0.948,3.885 0.656,3.885 true 1.063,1.656 1.469,1.844 0.406,0.188 10 AIND 2.344,1.656 2.75,1.844 0.406,0.188 10 A/C 2.573,0.563 2.979,0.75 0.406,0.188 10 B 2.604,2.24 3.01,2.427 0.406,0.188 10 *1 1.74,0.563 2.146,0.75 0.406,0.188 10 B 0.531,1.51 0.938,1.698 0.406,0.188 10 E 2.833,3.552 3.24,3.74 0.406,0.188 10 *a 0.469,3.792 0.875,3.979 0.406,0.188 10 *b
*1 A/C Switch
*a Max hot position
*b Max cold position


Measure the resistance.

i.

Remove the No. 3 heater control sub-assembly.

Click hereVehicle Interior>HEATING / AIR CONDITIONING>AIR CONDITIONING PANEL(for Manual Air Conditioning System)>DISASSEMBLY


ii.

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

Standard Resistance:
Tester Connection Switch Condition Specified Condition
2 (B) - 3 (A/C) A/C switch on Below 1 Ω
2 (B) - 3 (A/C) A/C switch off 10 kΩ or higher
7 (B) - 8 (E) Max hot position Below 1 Ω
7 (B) - 8 (E) Other than max hot position 10 kΩ or higher




b.

Check that the indicator light comes on.

i.

Turn the A/C switch on.


ii.

Connect a positive (+) lead from the battery to terminal 2 (B) and negative (-) lead to terminal 4 (AIND), and check that the indicator light comes on.

OK:

The indicator light comes on.




Result:
Proceed to
OK
NG



OK

2.CHECK HARNESS AND CONNECTOR (NO. 3 HEATER CONTROL SUB-ASSEMBLY - BATTERY)

NG

REPLACE NO. 3 HEATER CONTROL SUB-ASSEMBLY

Click hereVehicle Interior>HEATING / AIR CONDITIONING>AIR CONDITIONING PANEL(for Manual Air Conditioning System)>DISASSEMBLY


2.CHECK HARNESS AND CONNECTOR (NO. 3 HEATER CONTROL SUB-ASSEMBLY - BATTERY)
a.
E269926C03
1.5,0.333 1.906,0.604 0.406,0.271 0.875,1.854 1.115,1.854 1.115,1.854 1.344,1.469 true 2.396,1.885 2.25,1.885 2.25,1.885 2.104,1.479 true 1.573,0.396 2.031,0.594 0.458,0.198 10 G23 0.052,0.052 0.51,0.25 0.458,0.198 10 *a 0.708,1.771 0.896,1.958 0.188,0.188 10 B 2.438,1.813 2.792,2 0.354,0.188 10 B
*a Front view of wire harness connector
(to No. 3 Heater Control Sub-assembly)


Disconnect the No. 3 heater control sub-assembly connector.


b.

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

Standard Voltage:
Tester Connection Switch Condition Specified Condition
G23-2 (B) - Body ground Ignition switch ON 11 to 14 V
G23-2 (B) - Body ground Ignition switch off Below 1 V
G23-7 (B) - Body ground Ignition switch ON 11 to 14 V
G23-7 (B) - Body ground Ignition switch off Below 1 V



Result:
Proceed to
OK
NG



OK

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

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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

Disconnect the G23 No. 3 heater control sub-assembly connector.


b.

Disconnect the G80 air conditioning amplifier assembly connector.


c.

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

Standard Resistance:
Tester Connection Condition Specified Condition
G23-3 (A/C) - G80-2 (A/C) Always Below 1 Ω
G23-4 (AIND) - G80-12 (LED) Always Below 1 Ω
G23-8 (E) - G80-3 (HEAT) Always Below 1 Ω
G23-3 (A/C) - Body ground Always 10 kΩ or higher
G23-4 (AIND) - Body ground Always 10 kΩ or higher
G23-8 (E) - Body ground Always 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

Click hereVehicle Interior>HEATING / AIR CONDITIONING>AIR CONDITIONING SYSTEM(for Manual Air Conditioning System)>PROBLEM SYMPTOMS TABLE


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR