Controller (Heating, Ventilation & Air Conditioning): Other

Controller (Heating, Ventilation & Air Conditioning): Other Hyundai Accent III

Connector Pin Function

CONNECTOR	PIN	FUNCTION
Connector (A)	1	Ground
	2	Blower 1 step
	3	Ground
	4	Blower 2 step
	5	Blower 3 step
	6	Blower 4 step
Connector (B)	1	Tail lamp (+)
	2	Battery (+)
	3	A/C output
	4	Vent mode
	5	Defrost mode
	6	Intake actuator (Fresh)
	7	Intake actuator (Recirculation)
	8	Sensor VCC (+5 V)
	9	IGN2
	10	Rheostat (-)
	11	Mode actuator feedback signal
	12	Intake actuator feedback signal
	13	Evaporator sensor (+)
	14	Blower ON signal
	15	A/C select
	16	Sensor Ground
	17	Ground
	18	PTC relay 2
	19	PTC relay 3
	20	Blower ON signal (ECU)
	21	PTC ON signal
	22
	23

CONNECTOR PIN FUNCTION DESCRIPTION CHART

Scheme 3

Scheme 3: Replacement

Scheme 4

Scheme 5

Scheme 6

Disconnect the negative (-) battery terminal.
Remove the center facia lower panel by pulling it using a screw driver after disconnecting a clips. Avoid damaging retaining clips.
Disconnect the connectors (A) from the center facia.
Remove the heater & A/C controller temperature control cable (A).
Remove the heater & A/C controller (A) after loosening 4 screws.
Installation is the reverse order of removal.

Scheme 7

Scheme 7: Component

CONNECTOR	PIN	FUNCTION	CONNECTOR	PIN	FUNCTION
CONNECTOR (A)	1	Rheostat	CONNECTOR (B)	1	In car sensor (+)
	2	Tail lamp (+)		2	A/C select signal
	3	Battery (+)		3	Ambient sensor (+)
	4	Power mosfet (Gate)		4	Evaporator temperature sensor (+)
	5	Power mosfet (Drain)		5	Speed sensor
	6	PTC on signal		6
	7	In car sensor motor (+)		7
	8	In car sensor motor (-)		8	Sensor voltage (5 V)
	9	Temp actuator (cool)		9
	10	Intake actuator (recirculation)		10	Temp actuator feedback signal
	11			11	Mode actuator feedback signal
	12	IGN 2		12	Photo sensor (+)
	13	Ground		13	Photo sensor ground
	14	Mode actuator (Vent)		14	Water temperature output
	15	Mode actuator (Defrost)		15
	16	Power mosfet (Drain)		16	Sensor ground
	17	A/C output
	18
	19	PTC relay 2
	20	PTC relay 3
	21	Blower (+)
	22	Temp actuator (Warm)
	23	Intake actuator (Fresh)
	24	Blower select signal
	25	IGN 2
	26	Ground

CONNECTOR PIN FUNCTION DESCRIPTION CHART

Scheme 8

Scheme 8: Self-diagnosis

Scheme 9

Scheme 10

Self-diagnosis process The F.A.T.C. module self test feature will detect electrical malfunction and provide error codes for system components with suspected failures. NOTE: DTC data can be retrieved from the control panel directly or from the DLC using the Hi-Scan Pro.
How to read self-diagnostic code After the display panel flickers three times every 0.5 second, the corresponding fault code flickers on the setup temperature display panel every 0.5 second and will show two figures. Codes are displayed in numerical format. Fault code SELF-DIAGNOSTIC FAULT CODE DESCRIPTION CHART Fault code Fail description Control unit 00 Normal 11 In-car temperature sensor open (High) 12 In-car temperature sensor short (Low) 13 Ambient temperature sensor open (High) 14 Ambient temperature sensor short (Low) 15 Water temperature sensor open (High) 16 Water temperature sensor short (Low) 17 Evaporator temperature sensor open (High) 18 Evaporator temperature sensor short (Low) 19 Air mix potentiometer open (Low) - Driver 19 Air mix potentiometer short (High) - Driver 20 Air mix motor (Driver) 21 Direction potentiometer open (Low) - Driver 21 Direction potentiometer short (High) - Driver 22 Direction control motor (Driver)
Fault code display Continuance operation Step operation
If fault codes are displayed during the check, Inspect malfunction causes by referring to fault codes.
Fail safe In-car temperature sensor: Control with the value of 23 °C (73.4 °F) Ambient temperature sensor: Control with the value of 20 °C (67 °F) Evaporator temperature sensor: Control with the value of -2 °C (28.4 °F) Photo sensor: None correction Temperature control actuator (Air mix potentiometer): If temperature set 17 °C - 24.5 °C, fix at maximum cooling position. If temperature set 25 °C - 32 °C, fix at maximum heating position. Mode control actuator (Direction potentiometer): Fix vent position, while selecting vent mode. Fix defrost position, while selecting all except vent mode. A.Q.S sensor: Doesn't control.

Scheme 11

Scheme 11: Replacement

Scheme 12

Scheme 13

Disconnect the negative (-) battery terminal.
Remove the center facia lower panel by pulling it using a screw driver after disconnecting a clips. Avoid damaging retaining clips.
Disconnect the connectors (A) from the center facia.
Remove the heater & A/C controller (A) after loosening 4 screws.
Installation is the reverse order of removal.