Hyundai Sonata: Seat Electrical / Lumber Support Units Repair procedures

Removal
1.
Disconnect the negative (-) battery terminal.
2.
Remove the front seat assembly.
(Refer to Body - "Front Seat Assembly")
3.
Remove the seat back.
(Refer to Body - "Front Seat Back Cover")
4.
Disconnect the lumbar support motor connector (A).

5.
Remove the lumbar support assembly after disengaging mounting clip (A).

Installation
1.
Install the lumbar support assembly.
2.
Install the seat back cover.
3.
Install the front seat assembly.
   
-
Make sure that the connectors are plugged in properly.
-
Check the rear lumbar support system.
Inspection
Diagnosis with GDS
1.
The body electrocal system can be quickly diagnosed failed parts with vehicle diagnostic system (GDS).
The diagnostic system (GDS) provides the following information.
(1)
Self diagnosis : Checking the failure code (DTC) and display
(2)
Current data : Checking the system input/output data state
(3)
Actuator test : Checking the system operation condition
(4)
Additional function : Other controlling such as he system option and zero point adjustment
2.
Select the "Car Model" and the system to be checked in order to check the vehicle with the tester.
3.
Select the "Power Seat Module (PSM)" to check the power seat module (PSM).
4.
Select the "Current Data" menu to search the current state of the input/output data.
The input/output data for the sensors corresponding to the power seat module (PSM) can be checked.
5.
If you will check the power door lock operation forcefully, select "Actuation Test".
Lumbar Support Motor
1.
Disconnect the connectors for each motor.
[Lumbar Support Motor]

2.
With the battery connected directly to the motor terminals, check if the motors run smoothly.
3.
Reverse the connections and check that the motor turns in reverse.
4.
If there is an abnormality, replace the motors.

Lumber Support Units Components and Components Location
Component Location [Mechanical Lumbar Support Assembly] ...

Fuel Filler Door
...

Other information:

Hyundai Sonata LF 2014-2019 Service Manual: Start/Stop Button Repair procedures
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Hyundai Sonata LF 2014-2019 Service Manual: General Safety Information and Caution
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