jm fatc guide

7/30/2019 Jm Fatc Guide

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TUCSON AIR CONDITIONER

1 Chonan Technical Service Training Center

Air conditioning System

Contents

INTRODUCTION 3 ACTUATORS

SPECIFICATION 5 - INTAKE DOOR ACTUATOR 19

PARTS LOCATION 6 - TEMP. DOOR ACTUATOR 20

INSTALL LAYOUT 6 - MODE DOOR ACTUATOR 21

REFRIGERANT CIRCUIT 7 SENSORS

PARTS IN ENGINE ROOM - FIN THERMO SENSOR 22

- CONDENSER 7 - INCAR SENSOR 23

- COMPRESSOR 8 - PHOTO SENSOR 24

- RECEIVER & DRIER 9 - AMBIENT SENSOR 25

- TRIPLE SWITCH 10 - AQS 26

PARTS IN CABIN - HUMIDITY SENSOR 27- HEATER UNIT 13 TEMPERATURE UNIT CHANGE 27

- EVAPORATOR UNIT 14 CONTROL LOGIC 28

- EXPANSION VALVE 15 SELF DIAGNOSIS

- AIR FILTER 15 - DTC LIST & FAILSAFE 32

- BLOWER MOTOR 16 PTC HEATER 33

- POWER TR 16

- HIGH SPEED BLOWER RELAY 18


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MEMO


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INTRODUCTION

Warning: Failure to follow procedures, or failure to adhere to warnings, cautions, and notices could

result in personal injury and/or unnecessary vehicle damage/repairs.

Cautions:

1. Before servicing any electrical components, disconnect the negative battery cable. Unless instructed

otherwise, the ignition switch must also be in the off or lock position.

2. This air conditioner system contains R-134a, which requires special handling to avoid personal injury. Always

follow the special handling instructions listed below:

a) Always wear eye protection and wrap a clean cloth around fittings, valves and connections when servicing

the refrigerant system.

b) Always work in a well-ventilated area and avoid breathing refrigerant fumes.

c) Do not weld or steam clean on or meat any air conditioner lines or components.

d) Do not allow refrigerant to come in direct contact with your skin. If R-134a cones into contact with any part

of the body, flush the exposed area with water and immediately seek medical attention.

e) When using R-134a cylinders, reinstall the heavy metal screw cap after each use.

f) Do not carry refrigerant containers in the passenger compartment of a vehicle when transporting R-134a

g) When filling a small R-134a cylinder from a large one, never fill the cylinder completely. Always allow space

above the liquid for expansion.3. Prior to disconnecting, removing, or replacing any air conditioner lines or components, all refrigerant must be

completely recovered using approved refrigerant recovery equipment.

4. R-12 is not compatible with R-134a. Using R-12 in this air conditioner system may cause system failure.

5. Do not remove caps from fitting until each component is ready for connection.

6. Do not release refrigerant into the atmosphere. Use your refrigerant recycling equipment whenever you need

to discharge the air conditioner system.

7. Keep refrigerant container temperature below 40C (104F).

8. Do not expose refrigerant or refrigerant containers to fire or flames


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Notices:

1. Reinstall fasteners in the same location from which they were removed.

2. Always use the correct part number fastener.

3. Always tighten fasteners and fittings to the correct torque value. Insufficient or excessive tightening can result

in leakage or damage to the air conditioner system.

4. Any time the air conditioner system has been opened to the atmosphere, it should be properly evacuated

before recharging with R-134a.

5. All parts should be at room temperature before uncapping to prevent condensation of moisture inside the

components.

6. O-rings and seals must be in perfect condition. A burr, or dirt, on a sealing surface may cause a refrigerant

leak.

7. When tightening O-ring fittings, the opposing fitting should be backed up with a wrench to prevent distortion of

the seal and allow for proper tightening.

8. Remember to reinstall the service valve caps after charging the air conditioner system.

9. Flexible hose lines should not be bent to a radius of more than four times the diameter of the hose.

10. Flexible hose lines should not be allowed to come within a distance of 2.5inches(64mm) of the exhaust

manifold.

11. Keep all tools and parts clean and dry.

12. Use protective covers to avoid damage to the body of the vehicle.13. When installing air conditioner lines or electrical harness, route them properly to avoid contact with moving

parts.


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DESCRIPTION

The A/C-Heater system combines heating, cooling, ventilation, dehumidifying. The heating system can be

made simply as is utilized the heat generated by the engine. In the other hand the cooling system requires more

complicated equipment to create cool air. When air is cooled, the moisture in the air condenses and forms water

droplets that separate from the air. The airflow is controlled by manual type and automatic type.

Full Automatic Temperature Control (FATC) features completely automatic control of discharge air

temperature. FATC also controls the circulation and humidity of the air inside the vehicle.

With FATC, the driver selects the temperature and the FATC functions to maintain that temperature,

regardless of outside temperature changes. A FATC control module controls air conditioning, ventilating, heating,

and defrosting systems. These electronic control systems automatically adjust doors, blower speeds, and

compressor cycling.

SPECIFICATION

2.0 2.7, DSL 2.0

Type HS-18 10PA-15C 10PA-17C

Oil FD46 XG 150g ND OIL8 120cc ND OIL8 200cc

Capacity 170cc/rev 155cc/rev 177cc/rev

Thermal fuse 184Off - -

R-134a, 600g

H/P

M/P

L/P

H/P: High Pressure, M/P: Middle Pressure, L/P: Low Pressure

Compressor

Refrigerant and quantity R-134a, 510g

Triple switch

(Kg/ G)

ON : 26.0 0.2 OFF : 32.0 2.0

ON : 18.0 0.8 OFF : 14.0 1.2

ON : 2.3 0.25 OFF : 2.0 0.2

Parts

Specification

JM (TUCSON)SM (SANTA FE)

Parts M anual Autom atic

C ontroller type Rotary Push button

Evaporator Tem p. control Duct-sensor

A/C O N/O FF O FF:0.5, ON:2.5

Blower speed control Reistor Power TR & High speed relay

M ode control Actuator

Tem p. select control Actuator


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PARTS LOCATIONS

INSTALL LAYOUT

A : A/C Relay

B : AQS Sensor

C : AMB. Sensor

D : Photo Sensor

E : FIN Thermo Sensor

F : In-car Sensor

G : FATC Controller

H : High Blower Relay

I : Power TR

J : Humidity Sensor

K: Blower Relay

AB

C

E

G

HD I K

J ,F

1

2

3

5

6

4

NO Parts Name

1 Heater Complete Assembly

2 Seal Assembly-Evaporator Pipe

3 Hose Assembly-Suc/Dis

4 Condenser

5 Compressor

6 Fan Motor Assembly-Cond.


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REFRIGERANT CIRCUIT

PARTS IN ENGINE ROOM

CONDENSERThe condenser in the air conditioning system is a device used to change high-pressure refrigerant vapor to a

liquid. It does this by providing a means for emitting heat from the hot refrigerant to the cooler atmosphere.

Parallel Flow type condenser improved the refrigerating efficiency and minimized than the Corrugated Type.

R-134a, parallel flow type

Blower Motor

Evaporator

Expansion Valve

Heat absorbed

CompressorCondenser

Heat removed

Receiver Drier


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COMPRESSOR (SWASH PLATE TYPE)The compressor is the power unit of the A/C system. It pumps out refrigerant vapor under high-pressure and

high heat on the discharge side (high side of system) and sucks in low-pressure vapor on the intake side (low

side).

NO Parts Nam e

1 Bolt

2 Hub. M/Clutch

3 Washer

4 Snap Ring

5 Rotor. M/Clutch

6 Snap Ring

7 Stator. M/Clutch

8 Screw

9 Conn. Brak't

10 Flange Bolt

11 Relief Valve

12 O-ring

13 Flange

14 Cpmp. Sub Ass'y

15 O-ring

16 S-cap

17 Cap Bolt

18 D-cap

2.0 2.7, DSL 2.0

Type 10PA-15C 10PA-17C

Oil ND OIL8 120cc ND OIL8 200cc

Capacity 155cc/rev 177cc/rev

Cylinder No. 10 10

Thermal fuse - -

SpecificationParts

Compressor

BETA 2.0Compressor DELTA 2.7, DIESEL 2.0Compressor


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SAFETY VALVE (Pressure Relief Valve)

: Release the high-pressurized refrigerant and oil - Operating pressure: 35.3~42.2kg/

RECEIVER AND DRIERReceiver Drier Function

TRIPLE SWITCH

Desiccant

Filter

InletOutlet

1. Refrigerant purification

2. Refrigerant storage

3. Vapor bubble separation

The receiver-drier is the storage tank forliquid refrigerant, and it also contains a

fiber and a desiccant (drying agent) to

remove foreign particles and moisture from

the circulating refrigerant.

The receiver-drier receives the high-

pressure liquid refrigerant from the

condenser and delivers it to the expansion

valve.


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There are 3 values of the set pressure, and it carries out the functions of dual switch, middle-pressure

switch. It senses the pressure of the refrigerant and if the pressure is raised, close the switch and turns the

cooling fan to the high-speed.

Low & high switch: Compressor control

Middle switch:Condenser fan control

High

Middle

Low

ECM

Middle (3)Middle (4)

Low & high (1) Low & high (2)

Low Hi h

Middle

1 3 4 2

Electric diagram


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1. Compressor & condenser fan control table

2. Switch on & off range

Low & high switch (kg/cm2)

Middle switch (kg/cm2)

2.00.2

Low switch

2.30.25 262.0

ON

OFF322.0

(High switch)

ON

OFF

14.01.2

18.0 0.8

Middle switch

Pressure (Kg/cm2) Compressor Conderser fan Remarks

2.3 ~ 15.5 ON OFF Pressure increasing

18 ~ ON ON Pressure increasing

32 OFF ON Excessive pressure

26.0 ~ 14.0 ON ON Pressure decreasing

14.0 ~ 2.0 ON OFF Pressure decreasing


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When the ignition switch is in the ON position, battery voltage is applied to the coil on the control side of the

A/C relay. Whth the A/C switch ON, voltage passes through the normally closed contacts of the triple switch,

and enters the ECM. Operating parameters permitting, when the ECM receives the A/C ON signal, it will apply a

ground to the control side of the A/C relay, allowing the relay contacts to close. The allows battery voltage,

which is always present at the load side of the A/C relay, to pass through its contacts to the coil in the A/C

compressor magnetic clutch. When this happen, the A/C compressor begins to operate.

M

A/CCOMP.

MID

High

Low

A/C out ut

B B

A/C ON

input

A/C pressure switch

input

FIN sensor

A/Crelay

RADI.

FAN

CON.

FAN

A/C relay control

EECCMM

FFAATTCC CCOONNTTRROOLL MMOODDUULLEE

M


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PARTS IN CABIN

HEATER UNITWhen engine coolant is allowed to flow through the heater core, heat from the coolant is transferred to the

cooler air flowing through the fins of the heater core and into the passenger compartment.


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EVAPORATOR UNIT1. Function

The evaporator is another heat exchanger in the air conditioning system. It has coils and fins like the

condenser, but functions in reverse. The evaporator receives the cold, low-pressure atomize liquid refrigerant

from the expansion valve. As this cold refrigerant passes through the coils of the evaporator, which vaporizes

and absorbs heat from the passenger compartment.

2. Operation

The state of the refrigerant immediately after the receiver drier is 100% liquid. As soon as the liquid pressuredrop, it starts boil, and by doing so, absorbs heat. This heat is removed from the air passing over the cooling

fins of the evaporator and causes the air to cool.

Refrigerant properly entered into the evaporator should allow for 100% liquid just after passing over the

receiver drier and 100% gas at the outlet.

(Normal operation) (Evaporator frizzing)


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EXPANSION VALVEThe purpose of the expansion valve is to allow high-pressure liquid to expand as it enters the evaporator. It

also controls, or meters the system to prevent the evaporator from flooding and freezing up. Expansion valve is

inner equaling pressure type (Block type). Diaphragm is installed at the upper part of expansion valve. And,

diaphragm upper chamber is connected to the sensing bulb.

AIR FILTER

1. DescriptionEmploying combination filter, dust and odor in the air is effectively

removed

2. Life time

Filter replacement period is 5,000~12,000km. But this can be shortening if

the road condition is bad causing more dust and black smoke in the air.

3. How to replace

* Remove the glove box.* Pull the locking part of the air filter cover

Caution!!

Make sure that mark on the filter.

BLOWER MOTOR ASSEMBLYIts purpose is to draw in passenger compartment air and send it through

the evaporator core and the heater core, if desire. It consists of a 12V

electronic motor and a squirrel cage style fan blade.

Air filter cover


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Motor : magnet motor

1. Rated voltage : 12V2. Without load

- speed : 3300 rpm (min)

- current : 3.0A (max)

3. Temperature range in use: -30C ~ 80 C

POWER TRBlower speed is controlled by the fan control switch and power TR. Changing the fan switch from positions 1

through 7, allowing the fan to run faster.

1. Power TR inspection method 1

Base

Collector Emitter


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2. Power TR inspection method 2

HIGH SPEED BLOWER RELAYWhen the blower switch is positioned at 8

thspeed, the FATC controller will apply a ground to the control side

of the high-speed blower relay. This allows battery voltage, to pass through its contacts to the coil in the high-

speed blower relay. When it happens, the blower motor operates at high-speed.

StepBLOWER

DISPLAYVoltage(V)

1 3.80.5

2 4.920.5

3 6.030.5

4 7.150.5

5 8.270.5

6 9.380.5

7 10.50.5

8 BAT+


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ACTUACTORS

INTAKE DOOR ACTUATORThe intake door actuator (fresh/recirculation actuator) is a 12V electric motor, located side the blower motor

assembly, and operated by the intake control switch.


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It allows an occupant to choose between fresh (outside) air or recirculated inside air by moving the intake

(fresh/recirculation) door to the desired position. When the door has reached the desired position, the actuator

stops.

TEMP DOOR ACTUATORTEMP DOOR ACTUATOR is located side of the heater unit. The actuator controls the position of the

temperature blend door based on the voltage signal from the FATC module. Potentiometer inside actuator

sends a feedback signal to the controller and controller cuts off the voltage signal coming from the controller

when the required door position is achieved.


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MODE DOOR ACTUACTOR

MODE DOOR ACTUATOR is located side of the heater unit.


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SENSORS

FIN THERMO SENSOR

1. DescriptionFin sensor is installed in the evaporator in order to detect the temperature of evaporator. It

prevents evaporator from freezing.

2. Location

: Inserted into the evaporator pin


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2-1 Characteristics

2-2. On/off temperatures:

0 ~ 0.5C : OFF

3.5 ~ 4C : ON

INCAR SENSORThe in-car sensor is located on the lower crash pad as shown in the picture. It contains a thermister, which

measures the temperature of the air inside the passenger compartment. It senses the passenger compartment

temperature, changes the resistance value, and enters the corresponding voltage into the automatic

temperature control module (FATC).

Temp.

(C)

Resistance

()

Output

voltage(v)

Temp.

(C)

Resistance

()

Output

voltage(v)

-5 10.37 2.82 12 4.43 1.78

-2 8.87 2.63 20 3.06 1.38

0 8 2.5 25 2.45 1.17

2 7.23 2.37 30 1.98 0.99

5 6.22 2.19 35 1.6 0.83

10 4.88 1.89 40 1.31 0.7


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Inspection Negative type thermistor, that resistance will rise with lower temperature, and reduce with higher

temperature.

PHOTO SENSORThe photo sensor is located by the driver side defrost nozzle. In response

to photo intensity level in vehicle, the sensor will send signal to control module

to control the blower level and discharge temperature.

It contains a photovoltaic (sensitive to sunlight) diode.

[Characteristics]

(Over 0.45V )

10 ~ 15cm


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AMBIENT SENSOR

The ambient temperature sensor is located at the front of the condenser fan shroud. This sensor detects thetemperature of outside air and sends voltage signals to the controller.

The sensor output will be used for discharge air temperature, sensor fail-safe, temperature door control,

blower motor level control, mix mode control and in-car humidity control.

It is a negative type thermistor; resistance will increase with lower temperature, and decrease with higher

temperatures

[Characteristics]

* Resistance between a& b]


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9 ~ 16V DC

12V DC

-30 ~ 105

Gasoline

engine gasCXHY, CO

Diesel

engine gasNOX, SO2

less 1 sec

Detectable

gas

Reaction time

Specification

Operating voltage

Rated voltage

Operating temperature

.

AQS (Air Quality System) Most drivers generally select the recirculation or fresh air mode

manually to intercept the inflow of harmful exhaust gas, in spite ofinconvenience and danger, while driving. These harmful gases can be causes

of tiredness, drowsiness or cough while driving.

Although they detect the exhaust gas and manually close the inlet of the

vehicles trapping the fumes inside, it is far too late to protect their health

because they already inhaled the exhaust gas. Inversely, if driving with the

inlet of the car closed completely, the shortage of air and the accumulation of

carbon dioxide (CO2) will be occurred. This causes fatigue, headache,

enervation, and drowsiness.

AQS gives a perfect solution to these problems. The Air Quality System

detects exhaust gas of neighboring vehicles and intercepts automatically. AQS

controls the inlet of car automatically and can be easily installed to the existing

vehicle. Manual operation is also available.

1. Location

The AQS is located at the front of the engine radiator.

Temperature ( ) Resistance ( )

-10 13.77

-5 10.50 8.09

5 6.29

10 4.93

20 3.12

30 2.02

40 1.35


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2. AQS switch

HUMIDITY SENSORHumidity sensor detects the relative humidity of the cars cabin. This

sensor converts it into the frequency signal (Hz) and sends the signal to the

FATC controller. If ambient air temperature or in-car humidity is outside

certain range, it will turn on A/C to control in-car humidity preventing in-car

fogging.

Air conditioner operation depending on ambient temperature and humidity

1. Sensor characteristics

TEMPERATURE UNIT CHANGE

User may chose the temperature indication between C and F.

Press the temp down button for 3 seconds during pressing auto button

* Setting unit: C (Battery disconnection)

%RH ref SPECIFICATION(Hz)

10 7060

20 6950

30 6855

40 6750

50 6645

60 6540

70 6410

80 6275

90 6100


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CONTROL LOGIC

1. In-car temperature correctionWhen the in-car sensor detects a sudden steep temperature change,

controller corrects the temperature differences slowly.

- 1C up / 4sec delay

- 1C down / 4sec delay

2. Ambient temperature correctionWhen the ambient sensor detects a sudden steep temperature change,

controller corrects the temperature differences slowly.

- 1C up / 3 min delay (ex. Underground, tunnel)

- 1C down / 4sec delay

3. Heat radiation correctionWhen the photo sensor detects a sudden steep solar radiation change,

controller compensates it slowly.

- 350 1000 (W/m2) / 1 min delay

- 350 1000 (W/m2) / 5 min delay

4. Temp. door controlTemperature door angle (0% ~ 100%) is automatically controlled according to the

selected temperature and other sensor signals.

: Available selected temperature range

- MAX COOL: 17C

- MAX HOT: 32C

- 17C 32C, 0.5C step (62F 90F, 1F step)

5. Blower speed control- AUTO mode: linear control

- MANUAL mode: 8 step control6. Mode control - AUTO: Mode changes automatically according to the

selected temperature and other sensor signals.

- Manual: Mode changes when the mode switch is selected.

VENTB/L FLOORMIX VENT

Keep pressing

Press for 3 seconds

or more


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7. Intake door mode

- The FRE/REC door state can be changed at AUTO mode according to the input data combination.

8. Compressor on/off control (AUTO mode)

- Fin sensor: lower 0.5C Compressor OFF

over 3C Compressor ON

9. Max hot function (When 32C is selected at AUTO mode)

- Temp door: MAX HOT side

- Mode door: Floor mode

- Intake door: FRE mod

- Compressor: OFF

- Blower speed: MAX high

10. Max cool function (When 17C is selected at AUTO mode)

- Temp door: MAX COOL side

- Mode door: VENT mode

- Intake door: REC mode

- Compressor: ON

- Blower speed: MAX HIGH

11. Warm air prevention function (Initial A/C operation)12. CELO (Cold Engine Lock Out)

functionOperating conditions A1. Mode auto

2. Selecting Mode: Bi-level, Floor, Mix

3. Water temperature sensor under 68

4. Blower auto

5. Setting temperature: 3 higher than indoor temperatureOperation release

- When the occupant operates blower switch, bower speed will be release.- When the occupants operates

mode switch, mode will be change. But blower motor runs low speed at remains time.- When the occupants

select Max. cool(17 ).

FATC- AUTO MODE

- A/C ON

- FIN sensor > 30

CCOONNDDIITTIIOONN OOUUTTPPUUTT

- BLOWER SPEED:

AUTO low: 12 seconds

AUTO low AUTO high:

30 seconds

CCOONNTTRROOLL


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- When the detected temperature by WTS exceeds 58 .

Operating conditions B

1. Ambient temp. 5

2. Indoor temp. Ambient temp. 15 3. Mode auto

4. Blower autoFunction Prohibition

- When the occupant operates Blower switch. - Indoor temp. Ambient temp. > 15 - When the occupants

select Max. cool(17 ).

Compressor controlA. Compressor control for evaporator temperature.

1.Function: Protect compressor during winter season.

2.Control pattern: B. Compressor control for ambient temperature.

1.Function: Protect compressor during winter season.

2.Control pattern:

DIAGNOSIS

The FATC module self diagnosis test feature will detect electrical malfunction and provide error codes for

system components with suspected failures.

6 sec.

IG ON

Auto On

Blower Off

Auto Low

Auto High

ModeDEF

Mode AutoMIX(D/F)

35 68

40

1 3 Comp. Off

Comp. On

2 4 Comp. Off

Comp. On

Ignition switch : OFFON

Press the OFF switch more than 4 times within 2 seconds

during pressing the Auto switch

After VFD display blinks 3times per 0.5 seconds, start self-

diagnosis.

Self-diagnosis (Continuous operation)

Press AUTOPress AUTO


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DTC list & failsafe

To use the vehicles battery power, to be ignited in heater assembly, heating the air. It is a kind ofsupplementary vehicle heater.

B. PTC Heater operation condition

* Engine rpm: Over 700 RPM

* Ambient temperature : Below 5

Return to original condition

Press OFF

Press OFF

DTC

CodeDescription Failsafe

00 Normal -

11 Open In-car sensor circuit

12 Short In-car sensor circuit

13 Open Ambient sensor circuit

14 Short Ambient sensor circuit15 Open W ater temp. sensor circuit

16 Short Water temp. sensor circuit

17 Open Fin sensor circuit

18 Short Fin sensor circuit

19 Open or shorted Temp. door potentiometer

20 Defective Temp. door potentiometer

21 Open or shorted Mode door potentiometer

22 Defective Mode door potentiometer

23 Open Humidity sensor circuit

24 Short Humidity sensor circuit

Vent mode : Vent mode Fixed

Other mode : Def mode Fixed

-

23 C Fixed

20 C Fixed

- 2 C Fixed

Setting temp. 17~24.5 C : MAX

Cool

-

Self-diagnosis (Step operation)


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* Battery voltage : 8.9V -OFF, 12.5V -ON

* Engine coolant temperature : Below 70

* Blower motor: ON * Operating time: 60 minutes

* Engine rpm * Battery voltage

D. PTC Heater control

PTC 1(15 seconds) PTC 1 + 2(15 seconds) PTC 1 + 2 + 3

E. Block diagram

PTC Heater operation conditions are satisfaction, Engine ECM operates relay 1, heater/air conditioner

controller receives relay 1 operation signal, it will apply a ground to the control side of relay 2 and 3, allowing the

relay contacts to close. When this happen, the PTC Heater begins to operate.

F. PTC Control logic

1. Entering condition

Blower motor: On

PTC select signal: On (Operation condition satisfaction)

2. PTC Relay control

When the controller received the PTC on signal, the controller checks the battery voltage every 15

seconds.

PTC ON

PTC OFF

600 r m 700 r m

PTC ON

PTC OFF

8.9 V 12.49 V

Engine

ECMHeater/ Air

conditioner

Controller

Relay

# 1

Relay

# 2

Relay

# 3

Relay operationBlower motor

o eratin si nal

Relay operation signal

Operation

condition

Satisfaction


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Battery voltage: Over 11.5 V (Normal), Below 11.5V(Abnormal)

PTC Relay operation order

PTC 1(15 seconds) PTC 1 + 2(15 seconds) PTC 1 + 2 + 3

PTC 1 + 2 + 3(15 seconds) PTC 1 + 2(15 seconds) PTC 1

3. PTC Off condition

Blower motor: Off

PTC select signal: Off

There is no delay time to PTC off when the blower motor off and PTC select signal off.

G. PTC Heater operation check

1. Method

Mode: Vent, Bi-level or Floor

Temperature: Full warm (HI)

Blower motor: Off (Press Off button)

Air intake switch: Press the intake switch for 5 seconds.

2. Control

A/C: Off

Air intake mode: Recirculation mode

LCD display blinks 30seconds per 0.5seconds.

Blower switch: Press the blower switch.

PTC Heater relay 2 and 3 operates for 30seconds.

3. Operation release

When the occupants operates A/C or Intake switch.

After PTC Heater operation for 30 seconds, it will turns off automatically.

When the occupant operates Ignition switch off.

It will go to initial condition (A/C off, Fresh mode), when PTC Heater operation checks release.

There is no PTC Heater check logic from Temperature or Mode switch operation.

BAT+ normal BAT+ normal

BAT+ abnormal BAT+ abnormal

jm fatc guide

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