• Each antenna cable center
conductor to the AM/FM
radio cable center
conductor.

5

• Each antenna cable outside
shell to the AM/FM radio
cable outside shell.

6

Did any of these measurements
show resistance greater than 1
ohm?
Measure the resistance from the
antenna cable center conductor to
the AM/FM radio cable outside
shell.
Is the resistance greater than
10,000 ohms?

Table 7, Multiband Antenna Diagnostics

NOTE: It may be necessary to remove the headliner for steps 3 through 5 in this troubleshooting
routine.
Step

1

2

Test Procedure*
Disconnect the CB antenna
connector from the back of the CB
radio. Measure the resistance
between the center pin and the
metal shell of the PL-259
connector.
Is the resistance greater than
10,000 ohms?
Measure the resistance between
the center pin of the CB antenna
PL-259 connector and the lower
rivet on the antenna assembly
(where the cable is riveted to the
film). See Fig. 5.

CB Thin-Film Antenna Diagnostics
Test Result

Action

Yes

Go to step 2.

No

There is a short circuit in one of the antenna cables. Locate
and replace the shorted cable.

Yes

Go to step 3.

No

There is an open circuit in the center conductor in one of
the coaxial cables. Locate and replace the open cable.

Is the resistance less than 5 ohms?

Page 12

Freightliner Service Bulletin, October 2015

Radio and Integrated Thin-Film Antenna Troubleshooting,
and Field Service Updates
> FLA COE
> FLB COE
> FLD Conventional
> Business Class
> FLC 112 Conventional

Step

3

4

> Century Class Conventional
> Argosy COE
> Cargo
> Columbia

Freightliner
Service Bulletin

> Coronado
> Business Class M2
> Cascadia
> 108SD/114SD

CB Thin-Film Antenna Diagnostics
Test Result
Action
Yes
Go
to
step
4.
Measure the resistance between
the metal shell of the CB antenna
There is a poor ground connection. Check the inline
PL-259 connector and cab ground.
connections for corrosion, and make sure that they are
No
connected together. Check the ground wire on the antenna
Is the resistance less than 5 ohms?
to make sure that it is securely screwed to ground.
Clear any insulation away from the antenna and secure it
Make sure that no roof insulation is
so that it does not come loose during normal vehicle
contacting the antenna, and that
operation. Foreign material contacting the antenna will
the antenna is properly adhered to
Yes
affect reception, and could damage the CB radio.
the roof.
Test Procedure*

Is the antenna loose, or is there
any foreign material in contact with
the antenna?

5

54-148

On the CB thin-film antenna,
measure the resistance between
the two rivets, where the antenna
wire attaches to the antenna film.
See Fig. 6. This is a resistance
test of the fuse. The fuse opens
when too much wattage attempts
to transmit through the antenna.

No

If the antenna does not adhere to the roof, replace the
antenna.
Go to step 5.

Yes

All antenna tests pass. Test the CB radio.

No

Replace the open fuse with Littelfuse LF 0454 750 (750 mA
Time Delay).

Is the resistance less than 2 ohms?
* Refer to CB antenna installation diagram for location of antenna and cables.

Table 8, CB Thin-Film Antenna Diagnostics

Step

1

2

Test Procedure*
Disconnect the AM/FM antenna
connector from the back of the
radio. Measure the resistance
between the center pin and the
metal shell of the antenna
connector.

AM/FM Thin-Film Antenna Diagnostics
Test Result

Is the resistance greater than
10,000 Ohms?
With the antenna disconnected
from the radio, measure the
resistance between the metal shell
of the antenna connector and cab
ground.
Is the resistance less than 5
Ohms?

Freightliner Service Bulletin, October 2015

Action

Yes

Go to step 2.

No

There is a short circuit in one of the antenna cables. Locate
short and replace the cable.

Yes

Go to step 3.

No

The ground connection is bad, or missing. Check the inline
connections for corrosion, and to make sure that they are
connected together. Check the ground wire on the antenna
to make sure that it is securely screwed to ground.

Page 13

54-148
Freightliner
Service Bulletin

Step

3

Radio and Integrated Thin-Film Antenna Troubleshooting,
and Field Service Updates
> FLA COE
> FLB COE
> FLD Conventional
> Business Class
> FLC 112 Conventional

> Century Class Conventional
> Argosy COE
> Cargo
> Columbia

> Coronado
> Business Class M2
> Cascadia
> 108SD/114SD

AM/FM Thin-Film Antenna Diagnostics
Test Procedure*
Test Result
Action
Measure the resistance between
the center pin of the AM/FM
Yes
Replace the antenna and cable assembly.
antenna connector and the rivet on
the antenna assembly (where the
cable is riveted on the film).
There is an open circuit in the center conductor in one of
No
the coaxial cables. Locate open circuit and replace cable.
Is the resistance less than 5
Ohms?

* Refer to AM/FM antenna installation diagram for location of antenna and cables.

Table 9, AM/FM Thin-Film Antenna Diagnostics

Integrated Thin-Film Antenna Replacement

1

06/07/2013

2

f546037

3

Fig. 5, Measuring the Resistance on the Thin-Film
Antenna Lower Rivet

06/19/2013

f546042

1. CB Antenna
2. Upper Rivet
3. Lower Rivet
Fig. 6, Thin-Film Antenna Fuse (headliner removed)

1. Remove the headliner.

NOTE: The antenna for CB radios is located on the driver-side roof. The antenna for AM/FM radios is
located on the passenger-side roof.

Page 14

Freightliner Service Bulletin, October 2015

Radio and Integrated Thin-Film Antenna Troubleshooting,
and Field Service Updates
> FLA COE
> FLB COE
> FLD Conventional
> Business Class
> FLC 112 Conventional

> Century Class Conventional
> Argosy COE
> Cargo
> Columbia

54-148
Freightliner
Service Bulletin

> Coronado
> Business Class M2
> Cascadia
> 108SD/114SD

2. Disconnect the antenna, and peel it off of the roof.
• See Fig. 7 for vehicles with AM/FM radio antennas.
• See Fig. 8 for CB radio antennas mounted on vehicles with a raised roof.
• See Fig. 9 for CB radio antennas mounted on vehicles without a raised roof.
2
2

1

1

A

B

01/24/2013

A.
B.
1.
2.

f545994

Antenna mounting on vehicles without a raised roof.
Antenna mounting on vehicles with a raised roof.
Antenna Cable
AM/FM Radio Thin-Film Antenna
Fig. 7, Thin-Film Antenna, Vehicles with an AM/FM Radio

3. Position the new antenna on the roof, then peel off the antenna’s roof-side adhesive liner and stick the
antenna to the center of the roof cap reinforcement.
4. Bundle and stow the excess antenna cable using wire ties.
5. Screw the ring terminal into the header assembly.
6. Turn on the radio and test the reception.
7. Install the headliner.

Freightliner Service Bulletin, October 2015

Page 15

Radio and Integrated Thin-Film Antenna Troubleshooting,
and Field Service Updates

54-148
Freightliner
Service Bulletin

> FLA COE
> FLB COE
> FLD Conventional
> Business Class
> FLC 112 Conventional

> Century Class Conventional
> Argosy COE
> Cargo
> Columbia

> Coronado
> Business Class M2
> Cascadia
> 108SD/114SD

B
2

A

2

1

3
1

3

01/24/2013

A.
B.
1.
2.
3.

f545995

Antenna configuration with a CB radio mounted in the overhead console.
Antenna configuration with a CB radio mounted on the dash.
Cable Bundles in the Headliner
CB Radio Thin-Film Antenna
Cable Bundles in the Overhead Console or A-Pillar
Fig. 8, Thin-Film Antenna, CB Radio on Vehicles with a Raised Roof

Antenna Cable Replacement
1. Remove the dash panels to access the antenna cable.
• To access the CB cable, remove the driver-side A-pillar, the instrumentation control unit, and the
auxiliary instrument panel. See Fig. 10.
• To access the AM/FM radio antenna, remove the passenger-side A-pillar, the doghouse panel, and
the auxiliary instrument panel. See Fig. 11.
2. Remove the cable where the short is occurring.
3. Route the new cable and tie strap it to the overhead commodity harness every 12 inches (30 cm).
4. Turn on the radio and test the reception.
5. Install the dash panels.

Thin-Film Antenna Fuse Replacement
NOTE: The CB antenna is located on the driver-side of the vehicle. The AM/FM radio antenna is
located on the passenger side of the vehicle.
1. Remove the headliner and the overhead console uphostery insert to access the fuse.

Page 16

Freightliner Service Bulletin, October 2015

Radio and Integrated Thin-Film Antenna Troubleshooting,
and Field Service Updates
> FLA COE
> FLB COE
> FLD Conventional
> Business Class
> FLC 112 Conventional

> Century Class Conventional
> Argosy COE
> Cargo
> Columbia

54-148
Freightliner
Service Bulletin

> Coronado
> Business Class M2
> Cascadia
> 108SD/114SD

3
2

3
1

2

1
A
01/24/2013

A.
B.
1.
2.
3.

B
f545996

Antenna configuration with a CB radio mounted in the overhead console.
Antenna configuration with a CB radio mounted on the dash.
Cable Bundles in the Overhead Console or A-Pillar
Cable Bundles in the Headliner
CB Radio Thin-Film Antenna
Fig. 9, Thin-Film Antenna, CB Radio on Vehicles without a Raised Roof

2. Locate the fuse at the base of the antenna, in between the two rivets. See Fig. 5.
3. Using a removal tool, lift the fuse out of the fuse holder.
4. Insert a new fuse (LF 0454 750) in the fuse holder.
5. Turn on the radio and test the reception.
6. Install the headliner and the overhead storage bin upholstery insert.

Freightliner Service Bulletin, October 2015

Page 17

54-148

Radio and Integrated Thin-Film Antenna Troubleshooting,
and Field Service Updates

Freightliner
Service Bulletin

1

> FLA COE
> FLB COE
> FLD Conventional
> Business Class
> FLC 112 Conventional

> Century Class Conventional
> Argosy COE
> Cargo
> Columbia

> Coronado
> Business Class M2
> Cascadia
> 108SD/114SD

3
2
3
1

01/24/2013

f545997