2.

Lightly tap the vehicle underbody components
with a rubber or plastic mallet to loosen and
remove debris.

Front sub-frame

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SUBJECT:

UNDERBODY CORROSION PREVENTATIVE SERVICE (SERVICE CAMPAIGN 989)

Left and right front lower control arms

Rear Coupled Torsion Beam Axle (CTBA)
-

If equipped, remove the rear CTBA
undercover.

3.

Use a wire brush to remove debris from the front
sub-frame, left and right front lower control
arms, and rear CTBA.

4.

Use a wire brush to clean the brake banjo bolt
surfaces at all four calipers and brake tube
fasteners.

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5.

UNDERBODY CORROSION PREVENTATIVE SERVICE (SERVICE CAMPAIGN 989)

Remove debris by inserting an air nozzle into
the interior cavity of the subframe, front lower
arms, and rear CTBA, then blow air in multiple
directions for a few seconds.
Use the marked areas as a guideline to insert
the nozzle as shown in the photos below.
Additional access might be possible to remove
more debris.
Front sub-frame

Left and right front lower control arms
There is no internal cavity in the front lower
arms. Blow air on the exterior surface to remove
remaining debris.

Rear CTBA

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UNDERBODY CORROSION PREVENTATIVE SERVICE (SERVICE CAMPAIGN 989)

Vehicle Preparation:
1.

Wrap the brakes with plastic bags to protect
them from overspray. Use tape to secure the
plastic in place. Leave the banjo fitting area
exposed as shown.

! CAUTION
•
•

The brakes must be sufficiently cooled
before it is wrapped.
May cause burns and melt the plastic.

2.

Wrap large plastic bags around the tires and
wheels to protect them from overspray. Use
tape to secure the plastic in place.

3.

Wrap the exhaust areas adjacent to the front
sub-frame and the rear Coupled Torsion Beam
Axle (CTBA) with plastic bags to protect them
from overspray. Use tape to secure the plastic in
place.

! CAUTION
•
•

The exhaust must be sufficiently cooled
before it is wrapped.
May cause burns and melt the plastic.

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UNDERBODY CORROSION PREVENTATIVE SERVICE (SERVICE CAMPAIGN 989)

Apply Cavity Wax:

! DANGER
•
•
•

This procedure must be performed in a well-ventilated area.
Must wear safety goggles, face protection, and gloves. Rinse eyes with water or skin
with soap and water. Do not inhale spray. Seek medical attention if needed.
Flammable & pressurized. Do not spray near flames, sparks, or heated areas. Do not
pierce can.

Apply the cavity wax at each of the locations noted in the following steps.
Generally for coating interior surfaces, insert the “inside” nozzle as deeply as possible at each point of
entry. Spray the cavity wax while simultaneously rotating the nozzle and slowly pulling the nozzle out
at a rate of about one second per inch. Continue this rotating/pulling motion until the pink tubing is
seen coming out of the hole. The pink tubing indicates about 50 mm of tubing left until in the nozzle.
Stop spraying when the pink tubing is seen.
Generally for coating exterior surfaces, use the “outside” nozzle and the wax gun. Use this nozzle if
the inside nozzle is too large to access the internal cavity of the components.
1.

Use the marked areas as a guideline to insert
the cavity wax nozzle for each of the
components. Additional access into the internal
cavity of the components might be possible.
Front sub-frame

TSB #: 22-01-092H

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SUBJECT:

SUBJECT:

UNDERBODY CORROSION PREVENTATIVE SERVICE (SERVICE CAMPAIGN 989)

Left and right front lower control arms
Do NOT spray cavity wax on the front lower
control arms. There is no internal cavity.
Do NOT spray cavity wax

Rear CTBA

i

Information

Wipe the excess wax off the exterior surfaces of the components.

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SUBJECT:

UNDERBODY CORROSION PREVENTATIVE SERVICE (SERVICE CAMPAIGN 989)

Apply Undercoating:

! DANGER
•
•
•

1.

This procedure must be performed in a well-ventilated area.
Must wear safety goggles, face protection, and gloves. Rinse eyes with water or skin
with soap and water. Do not inhale spray. Seek medical attention if needed.
Flammable & pressurized. Do not spray near flames, sparks, or heated areas. Do not
pierce can.

Spray the black undercoating to coat the exterior
surfaces of the listed components. Refer to the
following images.
Front sub-frame

Left and right front lower control arms

Rear CTBA
-

Spray the undercoating on the entire rear
CTBA. Photo shown to the right is for
reference only.

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2.

UNDERBODY CORROSION PREVENTATIVE SERVICE (SERVICE CAMPAIGN 989)

Additional brake and fuel tube brackets and
connectors:
- Banjo and brackets at each wheel position
(A)
- Brake tube 2-way connector (B)
- Rear brake and fuel tubes within the area
marked in (C)
- Areas marked in the boxes next to (D)
Veloster (FS)

B

A

A

D

C

D

D

A

A

D

3.

Remove all the plastic bags.

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4.

UNDERBODY CORROSION PREVENTATIVE SERVICE (SERVICE CAMPAIGN 989)

STUI
Using STUI, take clear photos of the
following components after the undercoating
is applied with the last 6 digits of the VIN and
the date of repair on a piece of paper. See
examples shown to the right.
1.
2.
3.
4.

Front sub-frame
Left front lower control arm
Right front lower control arm
Rear CTBA

Front Sub-Frame

Upload all four (4) photos to STUI.

Photo of left and right lower
control arms required

Rear CTBA
5.

Reinstall the parts in the reverse order of
removal.

6.

The procedure is now complete.

TSB #: 22-01-092H

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