RM35X0E _58 Vehicle Interior _079316 HEATING / AIR CONDITIONING _0386651 AIR CONDITIONING SYSTEM(for Automatic Air Conditioning System) J

HEATING / AIR CONDITIONING  AIR CONDITIONING SYSTEM(for Automatic Air Conditioning System)  Viscous Heater with Magnet Clutch Circuit  


DESCRIPTION

When the heater switch assembly is pushed, the air conditioning amplifier assembly turns on the viscous heater relay and operates the viscous heater. If the viscous heater does not operate when the heater switch assembly is pushed, there may be a problem in the circuit shown below.

Malfunction Status Factor
Viscous with magnet clutch assembly does not operate when heater switch assembly is pushed while engine is cold. Viscous heater circuit malfunction

WIRING DIAGRAM

E414343E01
5.458,2.083 5.917,2.281 0.458,0.198 10 false MGCA 5.417,0.885 5.875,1.083 0.458,0.198 10 false SWVC 5,0.75 5.458,0.948 0.458,0.198 10 false 12 5.031,1.958 5.49,2.156 0.458,0.198 10 false 21 5.219,2.938 6.802,3.438 1.583,0.5 10 false Air Conditioning Amplifier Assembly 2.542,1.406 3,1.604 0.458,0.198 10 false N13 2.542,1.563 4.083,1.813 1.542,0.25 10 false Heater Switch Assembly 3.823,0.875 4.115,1.073 0.292,0.198 10 false +S 4.156,0.885 4.448,1.083 0.292,0.198 10 false 2 2.313,0.875 2.604,1.073 0.292,0.198 10 false 5 0.052,2.208 0.958,2.792 0.906,0.583 10 false from IG1 NO.1 Relay 1.375,2.354 2.281,2.552 0.906,0.198 10 false A/C-IG1 NO.2 3.021,2.948 3.896,3.198 0.875,0.25 10 false VISC HTR 3.906,2.083 4.365,2.281 0.458,0.198 10 false 1 3.917,2.5 4.375,2.698 0.458,0.198 10 false 3 2.719,2.083 3.177,2.281 0.458,0.198 10 false 2 2.719,2.5 3.177,2.698 0.458,0.198 10 false 5 2.521,4.521 4.156,4.771 1.635,0.25 10 false E98 2.531,4.667 4.281,5.083 1.75,0.417 10 false Viscous Heater with Magnet Clutch Assembly 4.5,3.542 4.958,3.74 0.458,0.198 10 false 1 2.542,0.885 2.833,1.083 0.292,0.198 10 false -S 4.969,1 5.427,1.198 0.458,0.198 10 false N42 4.979,2.208 5.438,2.406 0.458,0.198 10 false N43

CAUTION / NOTICE / HINT

HINT:

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


PROCEDURE

1.READ VALUE USING GTS (IDLE UP/PWR HEAT SWITCH)
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 / Data List.


e.

Check the value(s) by referring to the table below.

Body Electrical > Air Conditioner > Data List
Tester Display Measurement Item Range Normal Condition Diagnostic Note
IDLE UP/PWR HEAT Switch Heater switch assembly ON or OFF ON: Heater switch assembly on
OFF: Heater switch assembly off 		-
Body Electrical > Air Conditioner > Data List
Tester Display
IDLE UP/PWR HEAT Switch
50003 121 173
OK:

The display is as specified in the normal condition column.



Result:
Proceed to
OK
NG



OK

2.INSPECT VISCOUS HEATER RELAY (VISC HTR)

NG

7.INSPECT HEATER SWITCH ASSEMBLY
2.INSPECT VISCOUS HEATER RELAY (VISC HTR)
a.

Remove the viscous heater relay (VISC HTR) from the No. 2 engine room relay block assembly.


b.

Inspect the viscous heater relay (VISC HTR).

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


Result:
Proceed to
OK
NG



OK

3.INSPECT VISCOUS HEATER WITH MAGNET CLUTCH ASSEMBLY

NG

REPLACE VISCOUS HEATER RELAY

3.INSPECT VISCOUS HEATER WITH MAGNET CLUTCH ASSEMBLY
a.

Remove the viscous heater with magnet clutch assembly.

Click hereVehicle Interior>HEATING / AIR CONDITIONING>VISCOUS HEATER>REMOVAL


b.

Inspect the viscous heater with magnet clutch assembly.

Click hereVehicle Interior>HEATING / AIR CONDITIONING>VISCOUS HEATER>INSPECTION


Result:
Proceed to
OK
NG



OK

4.CHECK HARNESS AND CONNECTOR (VISCOUS HEATER RELAY (VISC HTR) - VISCOUS HEATER WITH MAGNET CLUTCH ASSEMBLY AND BATTERY)

NG

REPLACE VISCOUS HEATER WITH MAGNET CLUTCH ASSEMBLY

Click hereVehicle Interior>HEATING / AIR CONDITIONING>VISCOUS HEATER>REMOVAL


4.CHECK HARNESS AND CONNECTOR (VISCOUS HEATER RELAY (VISC HTR) - VISCOUS HEATER WITH MAGNET CLUTCH ASSEMBLY AND BATTERY)
a.

Remove the viscous heater relay (VISC HTR) from the No. 2 engine room relay block assembly.


b.

Disconnect the E98 viscous heater with magnet clutch assembly connector.


c.

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

Standard Resistance:
Tester Connection Condition Specified Condition
Terminal 3 - E98-1 Always Below 1 Ω
Terminal 3 or E98-1 - Body ground Always 10 kΩ or higher



d.

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

Standard Voltage:
Tester Connection Switch Condition Specified Condition
Terminal 2 - Body ground Ignition switch off Below 1 V
Terminal 2 - Body ground Ignition switch ON 11 to 14 V
Terminal 5 - Body ground Ignition switch off Below 1 V
Terminal 5 - Body ground Ignition switch ON 11 to 14 V



Result:
Proceed to
OK
NG



OK

5.CHECK HARNESS AND CONNECTOR (VISCOUS HEATER RELAY (VISC HTR) - AIR CONDITIONING AMPLIFIER ASSEMBLY)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

5.CHECK HARNESS AND CONNECTOR (VISCOUS HEATER RELAY (VISC HTR) - AIR CONDITIONING AMPLIFIER ASSEMBLY)
a.

Remove the viscous heater relay (VISC HTR) from the No. 2 engine room relay block assembly.


b.

Disconnect the N43 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
Terminal 1 - N43-21 (MGCA) Always Below 1 Ω
Terminal 1 or N43-21 (MGCA) - Body ground Always 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

6.CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

6.CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY
a.
E407115C11
0.063,0.375 0.563,0.625 0.5,0.25 0.948,1.188 0.854,1.75 0.854,1.75 0.521,1.75 true 0.073,1.677 0.531,1.875 0.458,0.198 10 false MGCA 0.188,0.417 0.646,0.615 0.458,0.198 10 false N43 0.063,0.063 0.521,0.26 0.458,0.198 10 false *a
*a Component with harness connected
(Air Conditioning Amplifier Assembly)


Remove the air conditioning amplifier assembly with its connectors still connected.

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


b.

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

Standard Voltage:
Tester Connection Condition Specified Condition
N43-21 (MGCA) - Body ground
·

Engine running

·

Blower switch: LO

·

Heater switch: On (magnet clutch on)


Below 1 V
N43-21 (MGCA) - Body ground
·

Engine running

·

Blower switch: LO

·

Heater switch: Off or on (magnet clutch off)


11 to 14 V



Result:
Proceed to
OK
NG



OK

REPLACE VISCOUS HEATER WITH MAGNET CLUTCH ASSEMBLY

Click hereVehicle Interior>HEATING / AIR CONDITIONING>VISCOUS HEATER>REMOVAL


NG

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

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


7.INSPECT HEATER SWITCH ASSEMBLY
a.

Remove the heater switch assembly.

Click hereVehicle Interior>HEATING / AIR CONDITIONING>HEATER SWITCH>REMOVAL


b.

Inspect the heater switch assembly.

Click hereVehicle Interior>HEATING / AIR CONDITIONING>HEATER SWITCH>INSPECTION


Result:
Proceed to
OK
NG



OK

8.CHECK HARNESS AND CONNECTOR (HEATER SWITCH ASSEMBLY - AIR CONDITIONING AMPLIFIER ASSEMBLY AND BODY GROUND)

NG

REPLACE HEATER SWITCH ASSEMBLY

Click hereVehicle Interior>HEATING / AIR CONDITIONING>HEATER SWITCH>REMOVAL


8.CHECK HARNESS AND CONNECTOR (HEATER SWITCH ASSEMBLY - AIR CONDITIONING AMPLIFIER ASSEMBLY AND BODY GROUND)
a.

Disconnect the N13 heater switch assembly connector


b.

Disconnect the N42 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
N13-2 (+S) - N42-12 (SWVC) Always Below 1 Ω
N13-5 (-S) - Body ground Always Below 1 Ω
N13-2 (+S) or N42-12 (SWVC) - 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