Hyundai Sonata: Seat Electrical / Air Ventilation Seat Repair procedures

Hyundai Sonata LF 2014-2019 Service Manual / Body Electrical System / Seat Electrical / Air Ventilation Seat Repair procedures

Removal
[Ventilation Blower]
1.
Disconnect the negative (-) battery terminal.
2.
Remove the front seat.
(Refer to Body - "Front Seat Assembly")
3.
Remove the under cover assembly.
(Refer to Body - "Front Seat Cushion Cover")

4.
Remove the blower fan (A) after removing the fixed clip (B) and screws.

5.
Remove the front seat back board.
(Refer to Body - "Front Seat Back Cover")
6.
Remove the duct (A) after remove the screws.

[Ventilation Seat Unit]
1.
Disconnect the negative (-) battery terminal.
2.
Remove the front seat.
(Refer to Body - "Front seat Assembly")
3.
Loosening the screws from the ventilation seat unit.

4.
Remove the ventilation seat unit (A) after disconnect the connectors (B).

Installation
[Ventilation Blower]
1.
Install the duct.
2.
Install the front seat back board.
3.
Install the blower fan.
4.
Install the front seat assembly.
5.
Connect the negative (-) battery terminal.
[Ventilation Seat Unit]
1.
Install the ventilation seat unit.
2.
Install the front seat assembly.
3.
Connect the negative (-) battery terminal.
Inspection
Ventilating seat consists of three units: the ventilating seat unit for control, switch for input and and blower for output.
Diagnosis Mode
1.
You can enter the diagnosis mode by turning the ventilation seat button on.
2.
You can enter the diagnosis mode by referring to the timing chart and description below.

A.
Push IGN ON while pressing the ventilation seat button from IGN OFF.
B.
Keep pressing IGN ON for more than two seconds before pressing it twice within five seconds.
C.
LED indicating the driver and passenger seats will blink from Low, Mid to High in order.
3.
After entering the diagnosis mode, you can check what failed by checking the blinking LED.

Failure Indicator
LED Blink
Inspection Items
Detailed Inspections

Short circuit of seat heating wire power (short)

1.
Short circuit of seat heating wire power (short)

Power disconnection of seat heating wire (disconnector)
1.
Disconnection or missing connector of heating seat power line

NTC (disconnector)
1.
NTC (disconnector)
2.
Disconnection or missing connector of NTC

NTC (short)
1.
NTC terminal short

Power disconnection of ventilation blower
Short circuit of Ventilation blower signal line
1.
Disconnection or missing connector of ventilation power line
2.
Disconnection or missing connector of ventilation signal line

Short circuit of ventilation blower power (short)
1.
Short circuit of ventilation blower power (short)

Grounding and short circuit of ventilation blower signal line
1.
Grounding and short circuit of ventilation blower signal line

 Power and short circuit of ventilation blower signal line
1.
Power and short circuit of ventilation blower signal line

4.
You can check the malfunctioning by checking the blinking LED.
5.
The ventilating seat unit will record the malfunctioning that occurred.
6.
If you press the heating seat button for more than five seconds, the LED for malfunctioning memory will blink four times and the recorded memory will be deleted.
7.
Pressing the IGN OFF button will end the diagnosis mode for the ventilating seat.
8.
You can check wheter the ventilating 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.
Air Ventilation Seat Schematic Diagrams
Circuit Diagram ...

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