3.

Use a wire brush to remove debris from:
• Front sub-frame
• Rear sub-frame
• Front lower arms
• Rear upper arms
• Rear lower arms
• Rear assist arms
• Rear trailing arms

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SUBJECT: UNDERBODY CORROSION PREVENTATIVE SERVICE (SERVICE CAMPAIGN 9A3)

4.

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

5.

Remove the remaining debris by inserting
an air nozzle into the interior cavities of the
sub-frames and control arms. Then blow air
in multiple directions.
Blow air over the exterior surfaces of
components as well.
Use the marked areas as a guideline to
insert the nozzle. Additional access might
be possible to remove more debris.
Front Underbody (FWD/AWD)
• Front sub-frame
• Front lower control arms

TSB #: 24-01-012H

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SUBJECT:UNDERBODY CORROSION PREVENTATIVE SERVICE (SERVICE CAMPAIGN 9A3)

Rear Underbody (FWD)
• Rear sub-frame
• Rear lower arms
• Rear upper arms
• Rear assist arms (exterior)
• Rear trailing arms (exterior)

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SUBJECT: UNDERBODY CORROSION PREVENTATIVE SERVICE (SERVICE CAMPAIGN 9A3)

Rear Underbody (AWD)
• Rear sub-frame
• Rear lower arms
• Rear upper arms
• Rear assist arms (external)
• Rear trailing arms (external)

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SUBJECT:UNDERBODY CORROSION PREVENTATIVE SERVICE (SERVICE CAMPAIGN 9A3)

TSB #: 24-01-012H

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SUBJECT:

SUBJECT: UNDERBODY CORROSION PREVENTATIVE SERVICE (SERVICE CAMPAIGN 9A3)

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
•
•

2.

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

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

TSB #: 24-01-012H

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SUBJECT:UNDERBODY CORROSION PREVENTATIVE SERVICE (SERVICE CAMPAIGN 9A3)

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.

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.

i

Information

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

TSB #: 24-01-012H

Page 17 of 27
SUBJECT:

SUBJECT: UNDERBODY CORROSION PREVENTATIVE SERVICE (SERVICE CAMPAIGN 9A3)

Front Underbody (FWD/AWD)
• Front sub-frame
• Front lower control arms

Rear Underbody (FWD)
• Rear sub-frame
• Rear lower arms
• Rear upper arms

TSB #: 24-01-012H

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SUBJECT:UNDERBODY CORROSION PREVENTATIVE SERVICE (SERVICE CAMPAIGN 9A3)

TSB #: 24-01-012H

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SUBJECT:

SUBJECT: UNDERBODY CORROSION PREVENTATIVE SERVICE (SERVICE CAMPAIGN 9A3)

Rear Underbody (AWD)
• Rear sub-frame
• Rear lower arms
• Rear upper arms

TSB #: 24-01-012H

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SUBJECT:UNDERBODY CORROSION PREVENTATIVE SERVICE (SERVICE CAMPAIGN 9A3)

TSB #: 24-01-012H

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SUBJECT: UNDERBODY CORROSION PREVENTATIVE SERVICE (SERVICE CAMPAIGN 9A3)

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, front lower
arms, rear upper arms, rear lower arms, rear assist arms, rear trailing arms, front and rear brake
caliper banjos, brake tube brackets, and fuel & brake tubes. Refer to the following images.

1.

Front sub-frame

Front lower arms

FWD rear sub-frame

FWD rear lower and upper arms

TSB #: 24-01-012H

FWD rear assist and trailing arms

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SUBJECT:UNDERBODY CORROSION PREVENTATIVE SERVICE (SERVICE CAMPAIGN 9A3)

AWD rear sub-frame

AWD rear upper and lower arms

AWD rear assist and trailing arms

Banjo and brackets at each wheel position

TSB #: 24-01-012H

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SUBJECT: UNDERBODY CORROSION PREVENTATIVE SERVICE (SERVICE CAMPAIGN 9A3)

2.

Additional brake and fuel tube brackets and
connectors:
-

Brake tube mounts (A)
Rear brake and fuel tubes within the
area marked in red (B)

A

B
B

A

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SUBJECT:UNDERBODY CORROSION PREVENTATIVE SERVICE (SERVICE CAMPAIGN 9A3)

3.

Remove all the plastic bags.

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.
7.

Front sub-frame
Rear sub-frame
Left front lower control arm
Right front lower control arm
Left rear trailing arm
Right rear trailing arm
Left rear suspension components:
lower control arm, upper control arm,
assist arm
8. Right rear suspension components:
lower control arm, upper control arm,
assist arm

1. Front sub-frame

2. Rear sub-frame

Upload all photos to STUI.

3. Left front lower control arm

TSB #: 24-01-012H

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SUBJECT: UNDERBODY CORROSION PREVENTATIVE SERVICE (SERVICE CAMPAIGN 9A3)

4. Right front lower control arm

5. Left rear trailing arm

6. Right rear trailing arm

TSB #: 24-01-012H

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SUBJECT:UNDERBODY CORROSION PREVENTATIVE SERVICE (SERVICE CAMPAIGN 9A3)

7. Left rear suspension components: lower
control arm, upper control arm, assist arm.

8. Right rear suspension components: lower
control arm, upper control arm, assist arm.

7.

Reinstall the parts in the reverse order of
removal.

8.

The procedure is now complete.

TSB #: 24-01-012H

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