F
E
D

B PILLAR
CONNECTOR

See Stereo Jumper Harness

GRD
95 WR+
95WR−
95WL−
95WL+
295E
GRD

B11
A4
B12
B4
B3
B10
A3
B9
A12
SUB
A9

95WR+
95WL−

R

95WR−
95WR+

L

SUB
WOOFER
ASSY

AMP

AUX VOL
CTRL CONN
95AR+

L.R.
MIDRANGE

95AL+
95AL−

07/27/2001

R.R.
MIDRANGE
f542868a

Fig. 15, Stereo System Wiring Diagram

Freightliner Service Bulletin, October 2015

Page 27

54-148

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

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

CD Player Diagnostics
Step

1

2

Test Procedure
Verify the problem with the CD
player. Insert a CD in to the player
to determine the problem with the
CD player.
What is the problem with the CD
player?
Check the CD player operation with
a known good CD. Use an audio
CD known to function properly in
another CD player. Inspect the
data surface (the side opposite the
label) for scratches, fingerprints, or
other evidence of damage. Only a
CD free of scratches and damage
should be used.

CD Player Diagnostics
Test Result

Action

The CD Player
Skips or Mutes

Go to step 2.

Unwanted CD
Ejection

If the CD continues to eject before the CD is finished
player, replace the radio/CD player.

Yes

Replace the radio/CD player.

No

No action required.

Does the the CD player continue to
skip or mute?
Table 14, CD Player Diagnostics

CD Changer Diagnostics
Step

1

2

Test Procedure
Verify operation of the CD changer.
Place CDs in the changer, and test
the operation of the changer.
Does the CD changer skip?
Check the CD changer damper
setting. The CD changer is
equipped with a damping system
with three settings: Vertical,
Horizontal, and 45 degree angle.
The adjustments for the setting are
located on each side of the CD
changer. The positions are labeled
V, H, and 45. The damper must be
set to the position that matches the
orientation of the CD changer.

CD Changer Diagnostics
Test Result

Action

Yes

Go to step 2.

No

Go to step 4.

Yes

Go to step 3.

No

Set the damper to match the changer installation position.

Is the damper setting correct for
the installation?

Page 28

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

> Century Class Conventional
> Argosy COE
> Cargo
> Columbia

Test Procedure
Check whether or not the CD
changer continues to skip or mute.
Check whether the CD changer
skips or mutes when using a
known good CD. Use an audio CD
known to function properly in
another CD player. Inspect the
data surface (the side opposite the
label) for scratches, fingerprints, or
other evidence of damage. Use
only a CD free of scratches and
damage.

Freightliner
Service Bulletin

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

CD Changer Diagnostics
Test Result

54-148

Action

Yes

Replace the CD changer.

No

No action required.

Yes

Go to step 5.
Check for power to the CD changer. See Fig. 16. Use a
known good ground and check Pin 15 at the B connector
for battery voltage. The B-connector plugs into the CD
changer.

Does the CD changer continue to
skip or mute?

4

Verify that the CD changer can
eject. Attempt to eject the CD
changer.

No

Will the CD changer eject?
5

6

7

Check for battery voltage at the CD
changer.

Yes

Go to step 6.

Is battery voltage present?
Check the ground at the CD
changer. Make sure the power to
the stereo is off. Check the
resistance between the ground wire
(pin 13 of connector B) of the CD
changer connector, and a known
good ground. See Fig. 16.

No

Go to step 7.

Yes

Replace the CD changer.

Is the ground circuit OK?

No

Repair the CD changer ground circuit.

Yes

Repair the CD changer power circuit.

No

Replace the radio.

Yes

No action necessary.

No

Go to step 9.

Is battery voltage present?
Check for voltage output from the
stereo. Check at pin 31 of the A
connector for battery voltage. See
Fig. 16. The A connector plugs in
to the stereo.
Verify that the speakers emit audio
when a CD is played.

8
When a CD is played, does sound
come from the speakers?

Freightliner Service Bulletin, October 2015

Page 29

54-148

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

Freightliner
Service Bulletin

Step

9

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

CD Changer Diagnostics
Test Result

Test Procedure
Check for AC voltage. Check for
AC voltage from pin 29 and 32 at
the stereo end of the CD changer
harness, and a known good
ground. See Fig. 16.

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

Action

Yes

Replace the radio.

No

Go to step 10.

Yes

Repair or replace the CD changer harness.

No

Replace the CD changer.

Check for AC voltage from pin 29
and 32 at the stereo end of the CD
changer harness, and a known
good ground. See Fig. 16.
Check the voltage while a CD is
playing. A counter will appear on
the display to indicate that the disc
is playing. AC voltage will vary.

10

> Century Class Conventional
> Argosy COE
> Cargo
> Columbia

Is there AC voltage at both pins?
Check for AC voltage at both pins.
Remove pins 10 and 11 from the
connector, then check the voltage
while a CD is playing. Check for
AC voltage between pins 10 and
11 at the CD changer end of the
harness, and a known good
ground. AC voltage will vary.
Is there AC voltage at both pins?

Table 15, CD Changer Diagnostics

NOTE: See Table 16 for CD changer wiring harness connector pinout information.
CD Changer Wiring Harness Connectors
Connector A,
8-Pin
—
—
—
32
29
35
34
30
31

Wire Color

Circuit Description

—
—
—
White
Yellow
Gray
Black
Purple
Red

—
—
Shield Guard
Right Audio
Left Audio
Audio Common
Ground
E & C Data
Battery

Connector B,
9-Pin
7
8
9
10
11
12
13
14
15

Table 16, CD Changer Wiring Harness Connectors

Page 30

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
1
29 32 35
31 34
30 33 36

09/06/2001

15
14
13
12
11
10
9
8
7
f543856

1. Connector A (viewed from the terminal end)

2. Connector B (viewed from the wire end)

Fig. 16, CD Changer Wiring Harness

Warranty
This is an informational bulletin only; warranty does not apply.

Attachment (Quick Reference Sheets)
See attached Quick Reference Sheets Stereo System Wiring Diagram and Troubleshooting Symptoms.

Freightliner Service Bulletin, October 2015

Page 31

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