24-54925-094
24-01840-062
24-54925-095
24-01840-068
Table 1, Telltale Part Numbers

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Freightliner Service Bulletin, 09/12/2017

ICU3 to ICU3S Replacement Guidelines
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
New Cascadia

54-299
Freightliner
Service Bulletin

Fig. 3, ICU3 Telltales, 24-54925-000

Freightliner Service Bulletin, 09/12/2017

Page 5

54-299
Freightliner
Service Bulletin

ICU3 to ICU3S Replacement Guidelines
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
New Cascadia

Fig. 4, ICU3S Telltales, 24-01840-000

Refer to Fig. 5 and Fig. 6 to correlate the ICU3 telltale locations with the ICU3S locations. The ICU3 has 9
optional telltales, numbered 1 through 9 from left to right. The ICU3S has 8 optional telltales, 1 through 4 on the
top row, and 5 through 8 on the second row.

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Freightliner Service Bulletin, 09/12/2017

ICU3 to ICU3S Replacement Guidelines
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
New Cascadia

54-299
Freightliner
Service Bulletin

Fig. 5, ICU3 Optional Telltale Locations

07/13/2017

f546778

Fig. 6, ICU3S Optional Telltale Locations

ICU3 to ICU3S Telltale Installation
IMPORTANT: The ICU3S uses LED illumination that is integrated into cluster. No service is required.
Opening the ICU3S to perform any service will void the warranty.
1. To install telltales on the ICU3S, remove the telltale carriers as shown in Fig. 7.

Freightliner Service Bulletin, 09/12/2017

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54-299
Freightliner
Service Bulletin

ICU3 to ICU3S Replacement Guidelines
FLA COE
FLB COE
FLD Conventional
Business Class
FLC 112 Conventional

Century Class Conventional
Argosy COE
Cargo
Columbia
122SD and Coronado

04/25/2017

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

f611479

Fig. 7, Installing Optional Telltales

2. To find the pin that corresponds with each telltale, open the wiring schematic (G06/G66) found in the bill of
material where the telltale is called out. See Fig. 8.

1

2

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f546783

1. EZWiring Tab
2. Wiring Schematic
Fig. 8, EZWiring Search Result

IMPORTANT: The pin assignment on the connector in the G06 schematic may not be applicable, due
to floating pins. The circuit number is static, but pin assignments can change.
3. Open the bill of materials related to the telltale, then open the related G06 schematic. See Fig. 9.

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Freightliner Service Bulletin, 09/12/2017

54-299

ICU3 to ICU3S Replacement Guidelines
FLA COE
FLB COE
FLD Conventional
Business Class
FLC 112 Conventional

Century Class Conventional
Argosy COE
Cargo
Columbia
122SD and Coronado

Freightliner
Service Bulletin

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

07/13/2017

f546782

Fig. 9, Telltale Circuit number on the G06 Schematic

4. Find the circuit number for the telltale, then enter the number into the floating pin list to determine the
correct pin for the telltale. See Fig. 10. Pin designations for optional telltales are the same for both the ICU3
and ICU3S, with some exceptions. See Table 2.

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Fig. 10, Associated Connector and Telltale Pin
ICU3S 56-Pin
Pin
A6
A7
A8
B1
B8
C11
C14
D4

Connector Terminal Designations
Designation
Optional Indicator #2 (WL02)
Optional Indicator #3 (WL03)
Optional Indicator #4 (WL04)
Optional Indicator #5 (WL05)
Optional Indicator #6(WL06)
Optional Indicator #7 (WL07)
Optional Indicator #1 (WL01)
Optional Indicator #8 (WL08)

Table 2, ICU3S 56-Pin Connector Terminal
Designations

5. If the ICU3S is replacing an ICU3 manufactured in 2007, or earlier, the following telltales may need to be
rewired:

Freightliner Service Bulletin, 09/12/2017

Page 9

54-299
Freightliner
Service Bulletin

ICU3 to ICU3S Replacement Guidelines
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
New Cascadia

• Optional #8
• Air filter
• Recirc
• No Charge
• HET
• DPF
• MIL
Use the specifications in Table 3 to rewire the telltales, if applicable.

ICU Pin

2007 Telltale

A-5

Air Filter

B-8

HET in Opt # 6

C-10

Recirc

C-14

DPF in Opt #1

A-09

No Charge

C-01

MIL in Opt #8

C-01

Opt # 8 (GND active)

Pin Designation for a Pre-2007 ICU3
ICU3S Telltale
Procedure
If A-05 is wired on a truck and used as an air filter lamp, the
HET
wire will need to be moved. Refer to Table 2 for an available
cavity.
If B-08 (optional telltale number 6) is wired on a truck and used
Optional # 6
for the HET lamp, the wire must be moved to the ICU3S HET
location, pin A-05.
If C-10 is wired on a truck and used as a recirc lamp, the wire
DPF
must be moved. Refer to Table 2 for an available cavity.
If C-14 (optional telltale number 1) is wired on a truck and used
Optional # 1
for the DPF lamp, the wire must be moved to the ICU3S DPF
location, pin C-10.
If A-09 is wired on a truck and used as a No Charge lamp, the
MIL
wire must be moved. Refer to Table 2 for an available cavity.
If C-01 (optional telltale number 8) is wired on a truck and used
Optional # 8
for the MIL lamp, the wire must be moved to the ICU3S MIL
location, pin A-09.
If C-01 (optional telltale number 8) is wired on a truck, but not
Not used
used for the MIL lamp, the wire must be moved. Refer to
Table 2 for an available cavity.
Table 3, Pin Designation for a Pre-2007 ICU3

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

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Freightliner Service Bulletin, 09/12/2017