A

A

B

B

TSB #: 23-01-034H

Page 7 of 16
SUBJECT:

SUBJECT: UNDERBODY CORROSION PREVENTATIVE SERVICE (SERVICE CAMPAIGN 991)

C

C

D

3.

Use a wire brush to remove debris from the
front sub-frame, rear sub-frame, rear upper
arms, and rear lower arms.

4.

Clean the brake banjo bolt surfaces at all
four calipers and brake tube fasteners using
a wire brush.

TSB #: 23-01-034H

Page 8 of 16
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SUBJECT:UNDERBODY CORROSION PREVENTATIVE SERVICE (SERVICE CAMPAIGN 991)

5.

Remove the remaining debris by inserting an air nozzle into the interior cavity of the
subframes and control arms. Then blow air in multiple directions.
Use the marked areas as a guideline to insert the nozzle. Additional access might be
possible to remove more debris.
-

Front sub-frame
Genesis (BH), Equus (VI)

Genesis Coupe (BK)

-

Rear sub-frame

-

Rear lower arms

-

Rear upper arms (BK model)

TSB #: 23-01-034H

Page 9 of 16
SUBJECT:

SUBJECT: UNDERBODY CORROSION PREVENTATIVE SERVICE (SERVICE CAMPAIGN 991)

Vehicle Preparation:
1.

Wrap the brake assemblies 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
wheel/tire/brake assemblies to protect them
from overspray. Use tape to secure the
plastic in place.

3.

Wrap the exhaust areas adjacent to the
front and rear sub-frames 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.

TSB #: 23-01-034H

Page 10 of 16
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SUBJECT:UNDERBODY CORROSION PREVENTATIVE SERVICE (SERVICE CAMPAIGN 991)

Applying 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. Continue this rotating/pulling motion until the pink tubing is seen coming out of the hole. The
pink tubing indicates there is about 50mm of tubing left until the end of the nozzle. Stop spraying
when the pink tubing is seen.
Generally for coating exterior surfaces, use the “outside” nozzle, provided with 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. Additional
access into the internal cavity of the
components might be possible.

TSB #: 23-01-034H

i

Information

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

Page 11 of 16
SUBJECT:

SUBJECT: UNDERBODY CORROSION PREVENTATIVE SERVICE (SERVICE CAMPAIGN 991)

-

Front sub-frame
Genesis (BH), Equus (VI)

Genesis Coupe (BK)

-

Rear sub-frame

-

Rear lower arms

-

Rear upper arms (BK model)

TSB #: 23-01-034H

Page 12 of 16
SUBJECT:

SUBJECT:UNDERBODY CORROSION PREVENTATIVE SERVICE (SERVICE CAMPAIGN 991)

Applying Undercoating:

! 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.

Spray the black undercoating on all exterior surfaces of the front and rear sub-frames, rear lower
arms, front and rear brake caliper banjos, brake tube brackets, and the fuel & brake tubes. Refer to
the following images.
1.

-

Front sub-frame
Genesis (BH), Equus (VI)

Genesis Coupe (BK)

-

Rear sub-frame

-

Rear lower arms

TSB #: 23-01-034H

Page 13 of 16
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SUBJECT: UNDERBODY CORROSION PREVENTATIVE SERVICE (SERVICE CAMPAIGN 991)

2.

-

Brake banjo and brackets at each
wheel position

-

Rear upper arms (BK model)

Additional brake and fuel tube brackets and
connectors:
- Brake tube 2-way connector (D)
- Brake tube mounts (E)
- Rear brake and fuel tubes within the
areas marked in red (F)

Genesis
Coupe (BK)

i

Information

Spray undercoating into the areas
marked in the yellow boxes (G).

Genesis (BH)

TSB #: 23-01-034H

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SUBJECT:UNDERBODY CORROSION PREVENTATIVE SERVICE (SERVICE CAMPAIGN 991)

Equus (VI)

3.

Remove all the plastic bags.

TSB #: 23-01-034H

Page 15 of 16
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SUBJECT: UNDERBODY CORROSION PREVENTATIVE SERVICE (SERVICE CAMPAIGN 991)

4.

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.
5.
6.

Front Sub-Frame

Front sub-frame
Rear sub-frame
Left rear lower control arm
Right rear lower control arm
Left rear upper control arm (BK only)
Right rear upper control arm (BK only)

Upload all photos to STUI.

Rear Sub-Frame

Photos of left and right
lower control arms required

Photos of left and right upper
control arms required (BK only)
5.

Reinstall the parts in the reverse order of
removal.

6.

The procedure is now complete.

TSB #: 23-01-034H

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