Hyundai Accent (HC): Heating, Ventilation and Air Conditioning / Controller

Hyundai Accent (HC) (2017 - 2022) Service Manual / Heating, Ventilation and Air Conditioning / Controller

Contents:

Heater & A/C Control Unit (Manual)
Heater & A/C Control Unit (FATC)

Heater & A/C Control Unit (Manual)

- Components

Connector	Pin NO	Function	Connector	Pin NO	Function
B	1	Battery (+)	B	17	IGN2
	2	-		18	ILL+ (TAIL)
	3	IGN1		19	-
	4	-		20	Sensor ground REF (+5V)
	5	Intake actuator (Fresh)		21	HTD (Rear defog indicator)
	6	Intake actuator (Recirculation)		22	Hazard signal
	7	Intake actuator (Feedback)		23	Rear defog swich
	8	Evaporator Temperature Sensor (+)		24	-
	9	Ambient Temperature Sensor (+)		25	-
	10	Blower on signal common		26	-
	11	Max blower on signal		27
	12	-		28	ECV+
	13	C_CAN High		29	ECV- (Ground)
	14	C_CAN Low		30	ILL- (RHEO)
	15	-		31	Sensor ground
	16	Ground		32	Ground

- Replacement

1.Disconnect the negative (-) battery terminal.

2.Remove the crash pad lower panel.(Refer to Body - "Crash Pad Lower Panel")

3.Remove the audio unit.(Refer to Body Electrical System - "Audio Unit")

4.Remove the glove box.(Refer to Crash Pad - "Glove Box Upper Cover Housing")

5.Remove the driver's side shower duct (A) after loosening the screw.

6.Disconnect the mode control cable (A).

7.Remove the passenger's side shower duct (A) after loosening the screw.

8.Disconnect the temperature control cable (A).

9.After loosening the mounting screws, remove the A/C & heater controller unit (A).

10.Disconnect the A/C & heater controller connectors (A).

11.To install, reverse the removal procedure.

Heater & A/C Control Unit (FATC)

- Components

Connector	Pin NO	Function	Connector	Pin NO	Function
A	1	Battery (+)	A	21	IGN2
	2	ADS Sensor (PWM)		22	IGN1
	3	ILL+ (TAIL)		23	HTD (Rear defog indicator)
	4	C_CAN High		24	PAB off signal
	5	C_CAN Low		25	PAB IGN1
	6	Defrost actuator (Open)		26	Sensor ground REF (+5V)
	7	Defrost actuator (Close)		27	Detent out (-)
	8	Mode control actuator (Vent)		28	Ambient Temperature Sensor (+)
	9	Mode control actuator (Def)		29	Evaporator Temperature Sensor (+)
	10	Temperature control actuator (Cool)		30	Photo sensor (-)
	11	Temperature control actuator (Warm)		31	-
	12	Intake actuator (Fresh)		32	-
	13	Intake actuator (Recirculation)		33	Hazard signal
	14	Mode control actuator (Feedback)		34	Rear defog swich
	15	Tmperature control actuator (Feedback)		35	-
	16	Intake actuator (Feedback)		36	Blower motor (+)
	17	Defrost actuator (Feedback)		37	Fet (Drain feedback)
	18	ECV+		38	Fet (Gate)
	19	ECV- (Ground)		39	Sensor ground
	20	ILL- (RHEO)		40	Ground

- Self Diagnosis

1.Self-diagnosis process.

• When operating the self-diagnostics, the below fault (self-diagnostics code) will blink at 0.5 seconds interval on the temperature display settings (driver's side only) and the remaining symbols are OFF .

2.Fault code display

(1)Continuance operation : DTC code.

(2)Continuance operation : DTC code.

(3)STEP operation.A. Nomal or one fault code is same as a continuance operation. B. DTC code.

3.If fault codes are displayed during the check, Inspect malfunction causes by referring to fault codes.

Display	Fail description	Note
0	Normal
11	Incar sensor OPEN
12	Incar sensor SHORT
13	Ambient sensor OPEN
14	Ambient sensor SHORT
17	Evaporator sensor OPEN
18	Evaporator sensor SHORT
19	Driver temp door potentionmeter OPEN or SHORT
20	Driver temp door potentionmeter Error
21	Mode door potentionmeter OPEN or SHORT
22	Mode door potentionmeter Error
23	Auto defog sensor OPEN
24	Auto defog sensor SHORT
25	Intake door potentionmeter OPEN or SHORT
26	Intake door potentionmeter Error
43	Defog door potentiometer OPEN or SHORT
44	Defog door potentiometer Error
45	APT CAN Signal Error
47	RPM CAN Signal Error
48	Vehicle speed CAN Signal Error
49	Engine coolant temprature CAN Signal Error
50	Cluster ionizer fault
71	ECV Fault (OPEN)
85	Blower motor Error	North America Type ONLY

4.Fail safe

NO	Item	Fault	Fail Safe
1	Amblent sensor	Open or Short	Control with the value of 20°C(67°F)
2	Incar sensor	Open or Short	Control with the value of 25°C(77.0°F)
3	Evaporator sensor	Open or Short	Control with the value of -2°C(28.4°F)
4	Temperature control actuator	Open or Short	If temperature setting 17°C(62.6°F) - 24.5°C(76.1°F), fix at maximum cooling position. If temperature setting 25°C(77°F) - 32°C(89.6°F), fix at maximum heating position.
5	Mode control actuator	Open or Short	Fix vent position, while selecting vent mode. Fix recirculation position, while selecting recirculation mode.
6	Intake control actuator	Open or Short	Fix fresh position, while selecting fresh mode. Fix recirculation position, while selecting recirculation mode.
7	Defogging door potentiometer	Open or Short	In the VENT, Bi-Level mode, DEF Door Potention Meter is fixed in CLOSE position. In the mode other VENT, Bi-Level mode, DEF Door Potention Meter is fixed in OPEN position.
8	Auto defogging sensor	Open or Short	Control with the value of 0%
9	ECV	Open	CF_Fatc_EcvFlt = 01H (fault) ECV OFF, A/C Output OFF, 0Nm
10	VS (Vehicle Speed)	FFh or NO reception	VS-TCU (From TCU2)
11	VS TCU (Vehicle Speed Calculated by TCU)	FFh or NO reception	VS-TCU (From TCU2)
12	N (Engine speed)	NO reception	Control with the value of 650rpm
13	F_N_ENG	0.1h or NO reception	Control with the value of 650rpm
14	TPS (Throttle position signal)	FFh or NO reception	Control with the value of 0%
15	TEMP_ENG	FFh or NO reception	Control with the value of 25°C(194.0°F)
16	R_TqAcnApvC	FFh or NO reception	Control with the value of 0Nm
17	R _ PAcnC (APT Sensor Output Value)	FFh or NO reception	Control with the value of 0 hPa (ECV OFF)
18	RLY-AC (Activation of air conditioner compressor relay)	NO reception	Control with the value of 0 hPa (ECV OFF)
19	R _ NEngIdlTgC (Engine Idle Target Speed)	FFh or NO reception	Control with the value of 0 hPa (ECV OFF)
20	SOAK_TIME (Engine Soaking Time)	NO reception	Control with the value of IGN off Time
21	SOAK_TIME_ERROR (Soak Time Error)	0.1h or NO reception	Control with the value of IGN off Time
22	Sunroof ON/OFF (CF_SunRoofOpenstate)	CAN signal	CF_SunRoofOpenState=OH

- Replacement

1.Disconnect the negative (-) battery terminal.

2.Remove the glove box upper cover housing.(Refer to Body - "Glove Box Upper Cover Housing")

3.Remove the audio unit.(Refer to Body Electrical System - "Audio Unit")

4.After loosening the mounting screws, remove the A/C & heater controller unit (A).

5.Disconnect the A/C & heater controller connector (A) and hose (B).

6.To install, reverse the removal procedure.

Blower

Advanced Driver Assistance System (ADAS)

Other information:

Hyundai Accent (HC) (2017 - 2022) Service Manual: Description and Operation

- Function NoItemDescription 1Washer Linked Wiper – If the washer switch is pressed ON for 0.06 second with the vehicle mode in IGN2, the wiper relay is turned ON after washer switch ON, and then the wiper relay is turned OFF after wiper parking signal ON. 2MIST Linked Wiper – If the wiper mist switch is pressed ON for 0.6 second with the vehicle mode in IGN2, the wiper relay is turned ON, and then OFF after wiper parking signal ON.

Hyundai Accent (HC) (2017 - 2022) Service Manual: Integrated Thermal Management Module (ITM)

- Components [Intelligent Variable Transmission (IVT) System] 1. Integrated thermal management module (ITM)2 . Integrated thermal management module (ITM) O-ring3. Heater pipe B4. Heater water hose5. Heater pipe A6 . Heater pipe A gasket7 . Water inlet fitting8 . Water inlet fitting gasket [Manual Transaxle System] 1. Integrated thermal management module (ITM)2 .

Heater & A/C Control Unit (Manual)
Heater & A/C Control Unit (FATC)