SB54-295

Replacing a Bulkhead Module with a 500k Auto Baud Rate
BHM
FLA COE
FLB COE
FLD Conventional
Business Class
FLC 112 Conventional
Century Class Conventional
Argosy COE
Cargo
Columbia
122SD and Coronado
> Business Class M2
Cascadia
> 108SD/114SD
54-295
Freightliner
Service Bulletin
General Information
Vehicles built in model year 2016 use a bulkhead module (BHM) with a 500k auto baud rate. If a BHM needs
replacement, it must be replaced with the new BHM (A66-03086-000) with a 500k auto baud rate.
IMPORTANT: It is normally not necessary to replace the BHM. Replacing the BHM should be a last
resort to solving electrical problems, unless the unit needs replacing due to physical damage.
Replacement
1. Open the hood.
2. Disconnect the negative leads from the batteries.
NOTE: The bulkhead module is located on the frontwall slightly below and outboard of the steering
column. See Fig. 1.
3. Disconnect bulkhead harnesses B1 through B4 from the engine side of the frontwall. See Fig. 2.
4. Disconnect bulkhead harnesses B5 through B7 from the bulkhead module on the cab side of the frontwall.
See Fig. 3.
5. Remove the tread plate from the driver door entry.
6. Remove the kick panel from the left side of the driver footwell.
7. Remove the five Torx® capscrews that secure the BHM to the cab side of the frontwall, then remove the
BHM by pulling it through the opening into the cab.
8. Place the new BHM through the frontwall opening from the cab side, then secure it with five Torx capscrews
and torque them 48 lbf·in (540 N·cm).
9. Install the kickpanel in the left side of the driver footwell and secure it with Torx capscrews.
10. Install the tread plate at the driver door entry.
11. Connect the bulkhead harnesses B5 through B7 to the BHM on the cab side of the frontwall.
12. Connect the bulkhead harnesses B1 through B4 to the BHM on the engine side of the frontwall.
IMPORTANT: The ignition and the battery switch must be in the ON position before the batteries are
connected for the 500k auto baud rate BHM to operate properly.
13. Turn the ignition switch to the ON position.
14. Turn the battery cutoff switch (if equipped) to the ON position.
15. Connect the batteries.
16. Close the hood.
17. Flash the new BHM. Refer to Section 54.12, Subject 110 for the Business Class M2 Workshop Manual, or
Section 54.07, Subject 110 for the 108SD/114SD Workshop Manual.
Warranty
This is an informational bulletin only. Warranty does not apply.
Freightliner Service Bulletin, February 2016
Page 1
54-295
Replacing a Bulkhead Module with a 500k Auto Baud Rate
BHM
Freightliner
Service Bulletin
FLA COE
FLB COE
FLD Conventional
Business Class
FLC 112 Conventional
Century Class Conventional
Argosy COE
Cargo
Columbia
122SD and Coronado
> Business Class M2
Cascadia
> 108SD/114SD
4
5
3
6
2
7
1
8
09/26/2001
1.
2.
3.
4.
5.
6.
7.
8.
f543870
B1, Forward Chassis Harness
B2, Engine Harness
B3, Frontwall Harness
B4, Frontwall Harness
Frontwall
B5, Dash Harness
B6, Dash Harness
B7, Dash Harness
Fig. 1, Bulkhead Module Harness Connections
Page 2
Freightliner Service Bulletin, February 2016
Replacing a Bulkhead Module with a 500k Auto Baud Rate
BHM
FLA COE
FLB COE
FLD Conventional
Business Class
FLC 112 Conventional
Century Class Conventional
Argosy COE
Cargo
Columbia
54-295
Freightliner
Service Bulletin
122SD and Coronado
> Business Class M2
Cascadia
> 108SD/114SD
2
1
1
3
3
2
4
4
5
5
09/25/2001
1.
2.
3.
4.
5.
f543915
Wiper Linkage Arm
Bulkhead Module
Hood Support Bracket
Quarter Fender
Power Distribution Module
Fig. 2, Bulkhead Module from the Engine Side
Freightliner Service Bulletin, February 2016
09/25/2001
1.
2.
3.
4.
5.
f543916
Driver Footwell Kick Panel
B5, Dash Harness
B6, Dash Harness
B7, Dash Harness
Bulkhead Module
Fig. 3, Bulkhead Module from the Cab Side
Page 3