Kia Forte: Seat Heater Switch / Air Ventilation Seat Unit

Kia Forte 2019-2024 (BD) Service Manual / Body Electrical System / Seat Heater Switch / Air Ventilation Seat Unit

Components and components location

Components

1. Ventilation blower

2. Ventilation seat unit (passenger seat only)

Schematic diagrams

Connector and Terminal Function

No.	Connector A	Connector B	Connector C
1	LH seat ventilation switch	NTC (-)	LH seat cushion heater power
2	RH seat ventilation switch	RH seat heater indicator (High)	LH seat back heater power
3	RH seat ventilation indicator (High)	LH seat heater indicator (Low)	RH seat cushion heater power
4	LH seat ventilation indicator (Low)	RH seat heater switch	RH seat back heater power
5	RH seat blower speed	RH seat heater indicator (Low)	LH seat blower power
6	LH seat blower speed	RH seat heater indicator (Mid)	RH seat blower power
7	LH seat ventilation indicator (Mid)	-	Battery (+)
8	LH seat ventilation indicator (High)	Illumination (-)	LH seat heater ground
9		Detent	Ground
10		Ventilation / Heater unit_IGN 1	RH seat heater ground
11		-
12		LH seat heater indicator (Mid)
13		LH seat heater indicator (High)
14		LH seat heater switch
15		RH seat ventilation indicator (Low)
16		RH seat ventilation indicator (Mid)
17		-
18		RH seat NTC (+)
19		LH seat NTC (+)
20		Ventilation / Heater unit_IGN 2

Circuit Diagram

Repair procedures

Inspection

Ventilating seat consists of three units : the ventilating seat unit for control, switch for input and and blower for output.

1.	You can enter the diagnosis mode by turning the heater seat button on.

2.	You can enter the diagnosis mode by referring to following description.

Press the heating wire switch as shown below.

(1)	Press and hold the heating wire switch for 3 seconds or more.

(2)	Release the switch for 3 seconds or less and press and hold it again for 1.5 - 3 seconds.

(3)	Release the switch for 3 seconds or less and press and hold it again for 3 seconds or more.

After entering the diagnostic mode, check the LED status to identify the error.

[Heater]

Failure Indicator	Failure items	Failure Details
Low : Blink Mid : Blink High : ON	Low voltage detection	- IGN 1 Power 8.5 volts or lower
Low : Blink Mid : Blink High : ON	Over voltage detection	- IGN 1 Power 16.5 volts or higher
Low : OFF Mid : Blink High : ON	Fuse (Short)	- IGN2 fuse disconnection
Low : OFF Mid : ON High : Blink	NTC/HEATER MAT (Disconnector)	- NTC element failure - Cushion/Back heater mat disconnection - NTC (+) wiring disconnection - NTC (-) wiring disconnection - Heater (+) wiring disconnection - Heater (-) wiring disconnection
Low : Blink Mid : ON High : OFF	NTC/HEATER MAT (Short)	- Short-circuit between the controller connector terminal and heater - Short-circuit in the heater system NTC (+) wiring - Short-circuit in the heater system NTC (-) wiring - Short-circuit in the heater system heater (+) wiring - Short-circuit in the heater system heater (-) wiring
Low : Blink Mid : ON High : Blink	Target temperature not reached	- Target temperature not reached within 40 minutes

[Ventilation Unit]

Failure Indicator	Failure items	Failure Details
Low : ON Mid : Blink High : ON	Short circuit of Ventilation blower power line	- Short circuit of ventilation blower power line / ground - Short circuit of ventilation blower power line / B (+)
Low : ON Mid : OFF High : Blink	Power disconnection of ventilation blower Disconnection of ventilation blower speed signal	- Power disconnection of veltilation blower - Disconnection of veltilation (GND) - Disconnection of ventilation blower speed signal
Low : Blink Mid : Blink High : OFF	Short circuit of ventilation blower speed signal	- Short circuit of ventilation blower speed signal / power line - Short circuit of ventilation blower speed signal / GND - Short circuit of ventilation blower speed signal / blower RPM signal
Low : OFF Mid : Blink High : Blink	Disconnection or missing connector of ventilation blower RPM signal	- Disconnection or missing connector of ventilation blower RPM signal
Low : Blink Mid : OFF High : Blink	Short circuit of ventilation blower RPM signal	- Short circuit of ventilation blower RPM signal /power line - Short circuit of ventilation blower RPM signal / GND

5.	You can check the malfunction by checking the blinking LED.

6.	The failure data is recorded in the memory by the ventilation seat unit.

7.	Press the heater seat switch on the passenger side for 5 seconds or more and the LED will start to blink four times and the failure data in the memory will be deleted.

8.	Turning the IGN OFF will end the diagnosis mode for the heater seat.

9.	You can check whether the heating seat system works properly after turning the IGN ON. If you want to check the error code, you can refer to the procedure of 2 above.

Removal

Ventilation Seat Unit

1.	Remove the heater unit. (Refer to Seat Electrical - "Seat Hater Unit")

Ventilation Seat Blower

1.	Disconnect the negative (-) battery terminal.

2.	Remove the driver / passenger seat assembly. (Refer to Body - "Front Seat Assembly")

3.	Remove the blower (C) by loosening the screws and clips (B) after disconnecting the connector (A).

Installation

1.	Install in the reverse order of removal.

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