f910806

1. Upper Seat Belt Retractor
Fig. 2, Seat and Seat Belt

8.2

Remove the plastic cover from the lower seat belt retractor; then remove the exposed fastener to
remove the lower seat belt retractor. See Fig. 3.

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f910807

1. Plastic Cover
Page 6

2. Retractor Fastener

Fig. 3, Lower Seat Belt Retractor

Daimler Trucks
North America LLC

Field Service Campaign

April 2020
SF592A-D

8.3

Remove the two screws to remove the B-pillar grab handle.

8.4

Remove the tread plate.

8.5

On vehicles with day cab configurations, remove the back wall upholstery by removing all panel fasteners and screws. See Fig. 4 for location of the fasteners. Then remove the B-pillar trim panel fasteners. Carefully remove the trim panel to avoid damaging the floor harness.

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f910808

1. Screws
Fig. 4, Day Cab Back Wall Fastener Locations

8.6

Page 7

On vehicles with sleeper cab configurations, remove the B-pillar trim panel fasteners. Carefully
remove the B-pillar trim panel to avoid damaging the floor harness.

Daimler Trucks
North America LLC

Field Service Campaign

April 2020
SF592A-D

WARNING
Do not substitute crash sensor mounting fasteners. Use the fasteners provided with the sensor to
ensure adequate engagement.
Before attaching the wiring to the sensor module and before connecting the batteries, be sure to attach
and tighten the mounting fasteners to the sensor module. Failure to follow these precautions may result
in the airbag being unintentionally deployed, which could cause personal injury or property damage.
9.

Align the new crash sensor beneath the seat bolt holes, and route the attached harness under the cutout
in the floor mat to the B-pillar as shown in Fig. 5.
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1. Harness Route
2. Harness

f910809

Connectors

Fig. 5, Harness Route for Crash Sensor

10.

Install the new crash sensor. Make sure that the sensor is oriented correctly, with the arrow on the sensor
label pointed to the front of the vehicle, and ensure that the mounting surface is flat, with no foreign objects between the sensor housing and the mounting surface. Tighten bolts to 11 to 13 lbf·ft (15 to 17.6 N-m).

11.

Connect the crash sensor harness to the existing floor harness connectors. See Fig. 5.

Page 8

Daimler Trucks
North America LLC

Field Service Campaign

April 2020
SF592A-D

12.

Remove the screws from the steering column as show in Fig. 6 and Fig. 7.; Then remove the steering
column covers.

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1. Steering Column Cover Screws
Fig. 6, Bottom Steering Column Cover Removal

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01/13/2020

f910811

1. Steering Column Cover Screws
Fig. 7, Top Steering Column Cover Removal

Page 9

Daimler Trucks
North America LLC

Field Service Campaign

April 2020
SF592A-D

13.

Remove the steering wheel cover by unsnapping the wheel cover assembly. Then unplug the clockspring
upleads from the steering wheel cover and horn, and remove the cover. See Fig. 8.

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f910812

1. Clockspring Upleads
2. Steering Wheel Cover
3. Steering Wheel
Fig. 8, Removing the Steering Wheel Cover

14.

Remove the jam nut that attaches the steering wheel to the steering column; push the clockspring upleads
down through the openings in the wheel; then remove the steering wheel. See Fig. 9.

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f910813

1. Jam Nut

2. Steering

3. Clockspring

Wheel
Fig. 9, Removing the Jam Nut
Page 10

Daimler Trucks
North America LLC

Field Service Campaign

April 2020
SF592A-D

15.

Unplug the harness from the clockspring; then disengage the snap features on the backside of the clockspring to unsnap it from the steering column.

16.

Install the new clockspring by snapping it into place on the steering column. Trim off the tie strap from the
yellow airbag connector, and connect both connectors to the new clockspring. See Fig. 10.

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f910814

1. Clockspring
2. Connectors Connected
Fig. 10, Installing the New Clockspring

17.

Install the new steering wheel:
17.1 Pass the switch, airbag, and horn connectors through the hole above the center of the new steering
wheel.
17.2 Align the new wheel to the steering column spline prior to pushing the wheel onto the spline.
17.3 Install the new jam nut, and tighten 33 to 41 lbf·ft (45 to 55 N·m).

WARNING
Consider undeployed airbags to be dangerous and capable of deploying at any time. Before performing
any work on these systems, review all service literature and comply with the following warnings and
precautions. Unintentional or improper deployment of the airbag system can result in injury or death.
See section 46.07 Air Bag System in the Cascadia Workshop Manual.
• Carry undeployed airbags with the bag and the trim cover pointed away from your body.
• Place undeployed airbags face up on a surface in an enclosed area.
• Do not place objects near or on top of an undeployed airbag.

Page 11

Daimler Trucks
North America LLC

Field Service Campaign

April 2020
SF592A-D
18.

Connect the switch, airbag, and horn connectors to the new airbag module. See Fig. 11. Then insert the
airbag module into the steering wheel assembly.

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f910815

1. Airbag Connector
2. Steering Wheel

4. Airbag and Cover
5. Steering Wheel

Switches

3. Horn Wires
Fig. 11, Connecting Harness Upleads

19.

Using the two new airbag retaining screws captured within the bottom of the new steering wheel, secure
the airbag to steering wheel, and tighten 44 to 53 lbf·in (500 to 600 N·cm). See Fig. 12.

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1. Airbag Retaining Screws
Fig. 12, Installing Steering Wheel Airbag
Page 12

f910820

Daimler Trucks
North America LLC

Field Service Campaign

April 2020
SF592A-D

20.

Make sure nobody is in the cab; then connect the batteries.

21.

While standing outside the cab and away from the front of the airbag, turn the ignition on. The SRS indicator on the dash should come on for several seconds and then go out. If the SRS indicator goes out, and
there are no active fault codes, the system is functioning properly.
21.1 Follow the appropriate procedure in the Cascadia Troubleshooting Manual if:
• There are active fault codes
• The SRS indicator remains on
• The SRS indicator does not come on or does not come on for several seconds before going
out

22.

Install the steering wheel column covers.

23.

On vehicles with sleeper cab configurations, install the B-pillar trim panel.
On vehicles with day cab configurations, install the back wall upholstery; then install the B-pillar trim panel.

24.

Install the tread plate

25.

Install the B-pillar grab handle.

26.

Install the upper seat belt mount onto the B-pillar.

27.

Attach the seat belt retractor to the bottom of the B-pillar, and install the cover on it.

28.

Connect the seat belt to the intermediate-connecting-point threaded rod on the seat.

29.

Move the seat back into the correct position.

Page 13

Daimler Trucks
North America LLC

Field Service Campaign

April 2020
SF592A-D
30.

Install the airbag warning labels on driver’s sunvisor. The labels must be installed on each side of the
driver’s sunvisor. See Fig. 13 for where to place the label (24-00956-000) on the underside of the sunvisor
(visible in viser-up position) and Fig. 14 for where to place the label (24-00956-001) on the top side of the
sunvisor (visible in viser-down position).
51.7 ± 5.0

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f910821

1. Label Location
Fig. 13, LH Sunvisor Shown in Up Position (Use part 24-00956-000)
553.5 ± 5.0
268.6 ± 5.0

45.7 ± 5.0

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f910822

1. Preferred Label Location

2. Secondary Label Location

Fig. 14, LH Sunvisor Shown in Down Position (Use part 24-00956-001)

31.

Clean a spot on the base label (Form WAR259). Write the campaign number, SF592, on a blank grey
completion sticker (Form WAR261), and attach it to the base label to indicate this work has been completed.

SF592C - Steering Wheel and Airbag Installation; Rolltek Wiring
Modification
1.

Check the base label (Form WAR259) for a completion sticker for SF592 (Form WAR261) indicating this
work has been done. The base label is usually located on the passenger-side door, about 12 inches (30
cm) below the door latch.

2.

If a sticker is present, no work is needed. If there is no sticker, proceed with the next step.

3.

Position the front tires straight ahead. If possible, drive the vehicle in a straight line for a short distance,
stopping at the spot where service work will be done.

Page 14

Daimler Trucks
North America LLC

Field Service Campaign

April 2020
SF592A-D

3.

Apply the parking brakes, and shut down the engine. Chock the tires.

WARNING
Wait two minutes after disconnecting the batteries to allow the internal components to discharge. Failure to allow the components to discharge could cause the airbag and pretensioner to deploy, resulting
in severe bodily injury or death.
4.

Disconnect the batteries, and wait two minutes before proceeding.

5.

Move the driver’s seat to the highest and most forward position possible to gain access to the Rolltek
module behind the seat.

6.

Remove the harness cover plate, the 6 pin connector, and the plastic covers from the Rolltek unit by disengaging the push rivets and pulling the covers away. See Fig. 15.

4
3
2

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