NHTSA ID Number: 10141752
Manufacturer Communication Number: sb54148
TSB/Document Date: 2018-06-18
Summary
sb54148 Radio and Integrated Thin-Film Antenna Troubleshooting, and Field Service UpdatesB
No
Replace the amplifier.
Yes
Check the speaker leads. Repair or replace as necessary.
No
Replace the amplifier.
Yes
Replace the amplifier.
No
Check the speaker leads. Repair or replace as necessary. If
OK, replace the radio.
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
9
10
11
12
> Century Class Conventional
> Argosy COE
> Cargo
> Columbia
Test Procedure
Verify operation of the front
speakers. Check the speaker lead
resistance at the radio connector.
Disconnect connector A from the
back of the radio. Measure the
resistance across each pair of pins
at connector A corresponding to
the speaker(s) not working.
Resistance should be 3 to 10
Ohms. See Fig. 14 and Fig. 15.
What is the resistance?
Check for speaker output at the
radio. Tune the radio to a
frequency that does not have an
active radio station. Set the volume
to a comfortable level. Backprobe
the pins of the affected speaker
output(s) at the radio connector.
The AC voltage output will range
from 0 to 1 volt, depending on the
volume level.
Is AC voltage present?
Check the speaker resistance. A
good speaker should have a
resistance value of 3 to 10 ohms.
Measure the resistance across the
input terminals of the speaker.
Is the resistance OK?
Verify operation of the rear
speakers. Check the speaker lead
resistance from the auxiliary
volume control to the speaker.
Unplug the connector at the
auxiliary volume control that leads
to the rear speakers. See Fig. 14
and Fig. 15. Locate the pair(s) of
pins in the connector that
correspond to the affected
speaker(s) and measure the
resistance across the pins. Circuits
95 AL- and 95 AL+ are for the left
side speaker, and circuits 95 ARand 95 AR+ are for the right side
speaker.
Freightliner
Service Bulletin
> Coronado
> Business Class M2
> Cascadia
> 108SD/114SD
Speaker Diagnostics
Test Result
54-148
Action
3 to 10 Ohms
Go to test 12.
Less Than 3
Ohms
Speaker leads are shorted. Repair or replace as necessary.
More Than 10
Ohms
Go to test 13.
Yes
Check the speaker for physical damage. Replace the
speakers as necessary.
No
Replace the radio.
Yes
Repair or replace the speaker leads.
No
Replace the speaker.
More Than 10
Ohms
Go to test 15.
3 to 10 Ohms
Go to test 16.
Less Than 3
Ohms
The speaker leads are shorted. Repair or replace as
necessary.
What is the resistance?
Freightliner
Service Bulletin, October 2015
Page 23
54-148
Radio and Integrated Thin-Film Antenna Troubleshooting,
and Field Service Updates
Freightliner
Service Bulletin
13
14
15
> FLA COE
> FLB COE
> FLD Conventional
> Business Class
> FLC 112 Conventional
Test Procedure
Check the speaker resistance. A
good speaker should have a
resistance value of 3 to 10 ohms.
Measure the resistance across the
input terminals of the speaker.
Is the resistance within range?
Check for AC voltage at the
auxiliary control panel. Tune the
radio to a frequency that does not
have an active radio station. Set
the volume to a comfortable level.
Check for AC voltage at the inputs
to the auxiliary control panel. See
Fig. 13 and Fig. 14. Circuits 95 ALand 95 AL+ are for the left side
speaker, and circuits 95 AR- and
95 AR+ are for the right side
speaker. The AC voltages for these
inputs should be approximately the
same. The AC voltage output will
range from 0 to 1 volt depending
on volume level.
Is AC voltage present?
Check for speaker output at the
radio. Tune the radio to a
frequency that does not have an
active radio station. Set the volume
to a comfortable level. Backprobe
the pins of the affected speaker
output(s) at the radio connector.
See Fig. 13 and Fig. 14. The AC
voltage output will range from 0 to
1 volt, depending on volume level.
> Century Class Conventional
> Argosy COE
> Cargo
> Columbia
Speaker Diagnostics
Test Result
> Coronado
> Business Class M2
> Cascadia
> 108SD/114SD
Action
Yes
Repair or replace the speaker leads.
No
Replace the speaker.
Yes
Check the speaker and speaker leads. Check the auxiliary
volume control. Repair as necessary.
No
Go to test 15.
Yes
Check the speaker leads between the radio and the
auxiliary volume control. Repair or replace as necessary.
No
Replace the radio.
Is AC voltage present?
Table 13, Speaker Diagnostics
Page 24
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
CONNECTOR P/N 12110088
RIGHT − OUT
B12
A12
BATT
RIGHT + OUT
B11
L− OUT
B10
GND
A9
L+ OUT
B9
RIGHT −
RIGHT+
R+IN
SPEAKER
OUTPUTS
FROM RADIO
L+IN
RIGHT
A4
B4
A3
B3
BUNK SPEAKERS
R−IN
L−IN
LEFT −
LEFT +
LEFT
L+
R+
f542869a
Fig. 13, Amplifier Wiring Diagram
Freightliner Service Bulletin, October 2015
Page 25
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
4
B
3
5
2
1
6
A
7
f542873a
05/04/99
A.
1.
2.
3.
4.
To the Rear Speakers Auxiliary Volume Control
Bunk Amplifier Harness
Main Cab Amplifier Harness
Sidewall Wire Trough
B-Pillar
B.
5.
6.
7.
To the PDM
Amplifier Power Harness Connection
Outer Side-Sill
Speaker Amplifier
Fig. 14, Rear Speaker Harness Routing
Page 26
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
L.F.
MIDRANGE
Freightliner
Service Bulletin
> Coronado
> Business Class M2
> Cascadia
> 108SD/114SD
DOOR
CONNECTOR
A
B
C
54-148
DOOR
CONNECTOR
F
95 F−
E
D 95 F+
A
B
C
F
E
D
95F−
L.F.
TWEETER
RF
MIDRANGE
95F−
95F+
95F+
RF
TWEETER
95AL+
A
B
STEREO C
CONN.
(B)
95AL−
95AR+ 95AR−
D
E
F
95AL+
A B
295E
95AR+
95AR−
B
D
295E
C D
B E
A F
STEREO CONN (C)
PDM
GRD
C
B
A
95AR−
95AL−
A
C
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TSB/Document ID: sb54148
Replacement Service Bulletin Number:
MFR Communication Date: 2018-02-26
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: EQUIPMENT ADAPTIVE/MOBILITY
MFR Component System:
MFR Component Subsystem:
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