NHTSA ID Number: 10173229
Manufacturer Communication Number: SF592
TSB/Document Date: 2020-04-03
Summary
Field Service Campaign for Freightliner
Cascadia Airbag Retrofit. Certain vehicles were built without airbags due to a parts shortage, and some vehicles may need an updated crash sensor.
01/14/2020
1. Lower Plastic Cover
2. Harness Cover
f910816
3. Push Rivet x8
4. Upper Plastic Cover
Plate
Fig. 15, Removing the RollTek Covers
7.
Remove the B-pillar trim panel:
7.1
Remove the upper seat belt retractor. See Fig. 2.
7.2
Remove the plastic cover from the lower seat belt retractor; then remove the lower seat belt retractor.
See Fig. 3.
7.3
Remove the two screws to remove the B-pillar grab handle.
7.4
Remove the tread plate.
Page 15
Daimler Trucks
North America LLC
Field Service Campaign
April 2020
SF592A-D
8.
7.5
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.
7.6
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.
Locate the two-pin connector underneath the B-pillar trim, and remove the factory-installed resistor; then
connect the two-pin connector to the Rolltek harness, securing it to the Rolltek assembly with the tie-strap
and adhesive pad. See Fig. 16.
2
3
1
01/14/2020
1. Two-Pin Connector
2. Tie-Strap and Adhesive Tab
3. Airbag Inflator Loop Harness
Fig. 16, Securing the 2-Pin Connector
Page 16
f910817
Daimler Trucks
North America LLC
Field Service Campaign
April 2020
SF592A-D
9.
Replace the lower Rolltek cover. The 6-pin connector should be visible in the access cutout. Connect the
6-pin connector to the Rolltek harness. See Fig. 17. Wait to install the RollTek cover push rivets until after
replacing the steering wheel airbag in case rework is needed.
1
2
3
01/14/2020
1. Lower Plastic Cover
2. 6 Pin Connector
f910818
3. RollTek Harness
Fig. 17, Connecting the Six-Pin Connector
Page 17
Daimler Trucks
North America LLC
Field Service Campaign
April 2020
SF592A-D
10.
Route the electrical harness to the seat via the exit point from RollTek cover, behind the RollTek tether,
and harness to ICP wire tie. See Fig. 18.
1
2
3
01/14/2020
f910819
1. Harness to ICP Wire Tie
2. Route Behind RollTek Tether
3. Exit Point From Cover
Fig. 18, Electrical Harness Route
11.
Remove the screws as shown in Fig. 6 and Fig. 7, and remove the steering column covers.
12.
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.
13.
Remove the nut that attaches the steering wheel to the steering column. Push the clockspring upleads
through the openings in the wheel; then remove the steering wheel. See Fig. 9.
14.
Unplug the harness from the clockspring; then disengage the snap features on the backside of the clockspring to unsnap it from the steering column.
15.
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.
16.
Install the new steering wheel:
16.1 Pass the switch, airbag, and horn connectors through the hole above the center of the new steering
wheel.
16.2 Install the new steering wheel to the steering column so the wheel spokes are within 5 degrees of the
straight ahead position.
16.3 Install the new jam nut, and tighten 33 to 41 lbf·ft (45 to 55 N·m).
Page 18
Daimler Trucks
North America LLC
Field Service Campaign
April 2020
SF592A-D
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.
17.
Connect the switch, airbag, and horn connectors to the new airbag module. See Fig. 11. Then insert the
new airbag module into the steering wheel assembly.
18.
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.
19.
Make sure nobody is in the cab; then connect the batteries.
20.
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.
20.1 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
21.
Install the steering wheel column covers.
22.
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.
23.
Install the tread plate
24.
Install the B-pillar grab handle.
25.
Install the upper seat belt mount onto the B-pillar.
26.
Attach the seat belt retractor to the bottom of the B-pillar, and install the cover on it.
27.
Install the harness cover plate and upper plastic cover on the RollTek unit, and install all push rivets.
28.
Move the seat back into the correct position.
29.
Install the airbag warning labels on driver’s sunvisor. The labels must be installed on each side of 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).
30.
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.
Page 19
Daimler Trucks
North America LLC
Field Service Campaign
April 2020
SF592A-D
SF592D - Steering Wheel and Airbag Installation
1.
2.
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. If a sticker is present, no work is needed. If there is no sticker, proceed
with the next step.
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.
3.
Apply the parking brakes, and shut down the engine. Chock the tires.
4.
Disconnect the batteries.
5.
Remove the seat belt from the intermediate-connecting-point threaded rod on the seat.
6.
Move the driver’s seat to the highest and most forward position possible to gain access to the crash
sensor mounted to the rear seat-mounting bolts. See Fig. 1.
NOTE: The crash sensor harness was purposely left disconnected and sealed in a plastic bag at the factory.
The harness will be connected during this repair. Remove the harness and discard the plastic bag.
7.
Remove the B-pillar trim panel:
7.1
Remove the upper seat belt retractor. See Fig. 2.
7.2
Remove the plastic cover from the lower seat belt retractor; then remove the lower seat belt retractor.
See Fig. 3.
7.3
Remove the two screws to remove the B-pillar grab handle.
7.4
Remove the tread plate.
7.5
On vehicles with day cab configurations, remove the back wall upholstery by removing all panel fasteners and screws. See Fig. 4 for location of fasteners. Then remove the B-pillar trim panel by removing the panel fasteners. Carefully remove the B-pillar trim panel to avoid damaging the floor harness.
7.6
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.
8.
Route the attached harness under the cutout in the floor mat to the B-pillar as shown in Fig. 5. Connect
the crash sensor harness to the existing floor harness connectors.
9.
Remove the screws as show in Fig. 6 and Fig. 7, then remove the steering column covers.
10.
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.
11.
Remove the 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.
12.
Unplug the harness from the clockspring; then disengage the snap features on the backside of the clockspring to unsnap it from the steering column.
13.
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 clockspring. See Fig. 10.
14.
Install the new steering wheel:
14.1 Pass the switch, airbag, and horn connectors through the hole above the center of the new steering
wheel.
14.2 Align the new wheel to the steering column spline prior to pushing the wheel onto the spline.
14.3 Install the new jam nut, and tighten 33 to 41 lbf·ft (45 to 55 N·m).
Page 20
Daimler Trucks
North America LLC
Field Service Campaign
April 2020
SF592A-D
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
15.
Connect the switch, airbag, and horn connectors to the new airbag module; then insert the new airbag
module into the steering wheel assembly. See Fig. 11.
16.
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.
17.
Make sure nobody is in the cab; then connect the batteries.
18.
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.
18.1 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
19.
Install the steering wheel column covers.
20.
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.
21.
Install the tread plate
22.
Install the B-pillar grab handle.
23.
Install the upper seat belt mount onto the B-pillar.
24.
Attach the seat belt retractor to the bottom of the B-pillar, and install the cover on it.
25.
Connect the seat belt to the intermediate-connecting-point threaded rod on the seat.
26.
Move the seat back into the correct position.
27.
Install the airbag warning labels on driver’s sunvisor. The labels must be installed on each side of 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).
28.
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.
Page 21
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TSB/Document ID: SF592
Replacement Service Bulletin Number:
MFR Communication Date: 2020-04-03
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: AIR BAGS
MFR Component System:
MFR Component Subsystem:
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