54-122

ICU3 Service Cluster Available
FLA COE
FLB COE
FLD Conventional
> Business Class

FLC 112 Conventional
> Century Class Conventional
> Argosy COE
Cargo

> Columbia
Condor
Coronado
Business Class M2

Freightliner
Service Bulletin

Description of Revisions: This bulletin replaces the version dated
May 2000. The part numbers for the ICU3 Service Clusters in
Table 1 have been updated.

General Information
To minimize vehicle downtime and assist field service technicians in quickly replacing ICU3 driver instrument
clusters (Instrumentation Control Unit, Level I), Freightliner PDCs now stock a selection of ICU3 service clusters.

IMPORTANT: Since the ICU3 is designed on a per vehicle basis, the clusters in stock for immediate
shipment may not exactly match the original, but should be better than or equal to the original cluster.
NOTE: An exact ICU3 replacement cluster can be ordered according to the original vehicle specifications. Since each ICU3 is custom-built, allow up to 10 working days for delivery.
This bulletin explains how to choose the correct replacement service cluster, describes service cluster configurations, explains how to replace the ICU3 cluster and its components, and summarizes the process. Read the entire document before beginning work.

Choosing the Correct Service Cluster
Choose the correct service cluster based on these three criteria:
1. Vehicle type – Choose either:
• Business Class or
• Argosy/Columbia
Specifying the correct vehicle type ensures the service cluster will be shipped with the correct face lens and
bezel. The service cluster must be shipped with a bezel to prevent the needles from falling out of calibration, which will void the warranty.
2. Transmission temperature gauge – Choose either:
• With the transmission temperature gauge (required on some vehicles with automatic transmissions) or
• Without the transmission temperature gauge
3. Gauge face configuration – Choose one of these three:
• U.S./Metric for the U.S. market
• Metric/U.S. for Canada or Mexico
• Metric only for export

Freightliner Service Bulletin, September 2005

Page 1

54-122
Freightliner
Service Bulletin

ICU3 Service Cluster Available
FLA COE
FLB COE
FLD Conventional
> Business Class

FLC 112 Conventional
> Century Class Conventional
> Argosy COE
Cargo

> Columbia
Condor
Coronado
Business Class M2

For the correct ICU3 service cluster part number, based on the three choices, see Table 1.

Vehicle type

Business Class

Argosy/Columbia

Options

ICU3 Service Cluster Part Numbers
Canada & Mexico
U.S. (U.S./Metric)
(Metric/U.S.)

With Transmission
Temperature Gauge
Without Transmission
Temperature Gauge
M-B Engine with
Transmission
Temperature Gauge
M-B Engine Without
Transmission
Temperature Gauge
With Transmission
Temperature Gauge
Without Transmission
Temperature Gauge
M-B Engine With
Transmission
Temperature Gauge
M-B Engine Without
Transmission
Temperature Gauge

Export (Metric only)

VDO A2C53102205

VDO A2C53102207

VDO A2C53102206

VDO A2C53102202

VDO A2C53102204

VDO A2C53102203

VDO 1 911 222 170S

VDO 1 911 222 194S

VDO 1 911 222 187S

VDO 1 911 222 149S

VDO 1 911 222 163S

VDO 1 911 222 156S

VDO A2C53102199

VDO A2C53102201

VDO A2C53102200

VDO A2C53102196

VDO A2C53102198

VDO A2C53102197

VDO 1 911 222 424S

VDO 1 911 222 280S

VDO 1 911 222 431S

VDO 1 911 222 390S

VDO 1 911 222 417S

VDO 1 911 222 400S

Table 1, ICU3 Service Cluster Part Numbers

Service Cluster Configurations
Service clusters are configured as follows:
• TACHOMETER — All service clusters include a functional tachometer gauge even if it wasn’t originally
specified on the vehicle.
• RESET BUTTON — All service clusters include the trip mileage reset button. The button will function on
the service cluster even if the original cluster did not include this option.
• AIR PRESSURE GAUGES — The only replaceable gauges on the ICU3 are the air pressure gauges. If
any other gauge in the cluster fails, the cluster must be replaced.
All Argosy/Columbia service clusters come with air pressure gauges, since they are standard original
equipment. Business Class service clusters do not come with air pressure gauges, since they are optional. When installing a service cluster in a Business Class vehicle, remove the air gauges from the old
cluster or order new air gauges, then install them in the replacement cluster.

Page 2

Freightliner Service Bulletin, September 2005

54-122

ICU3 Service Cluster Available
FLA COE
FLB COE
FLD Conventional
> Business Class

FLC 112 Conventional
> Century Class Conventional
> Argosy COE
Cargo

> Columbia
Condor
Coronado
Business Class M2

Freightliner
Service Bulletin

• TELLTALES — Each of the nine optional warning lights located in the top row at the center of the ICU3
consists of a lamp and a small plastic bezel with the warning message printed on it. The plastic bezel
covering the lamp is referred to as a "telltale" lens.
Though service clusters come with lamps in all warning light locations, only the warning lights wired for
the original cluster will illuminate when the ICU3 service cluster is plugged in to the main cab harness.
Bulbs for warning lights that are not used do not need to be removed from the cluster.
The service cluster does not include the top row telltales; these must be removed from the old cluster
and placed in the same positions in the service cluster. This can be done without disassembling the
ICU3. Using a pair of needlenose pliers or a similar tool, grab the exposed tab at the top of the telltale
slot (from the back) and carefully pull the telltale out from the top of the ICU.

Replacing the ICU3 Cluster and its Components
Use either the Business Class instructions or the Argosy/Century Class instructions that follow to replace the
ICU3 and its components.

Business Class
See the Business Class Trucks Service Manual, Section 54.17, for complete information about the ICU3 (Instrumentation Control Unit, Level I).

CAUTION
Electronic components of the level I ICU (ICU3) are vulnerable to damage from static electricity. If available, wear a wrist grounding strap connected to a ground in the cab or workbench. If a grounding strap
is not available, touch a grounded component immediately before doing any work that could bring a
tool or body part in contact with level I ICU circuitry.
Use the following work instructions to replace the ICU3 cluster:
1. Remove the old cluster from the dash. For instructions, see the Business Class Trucks Service Manual,
Section 54.17, Subject 100.

NOTE: Step 2 applies to Business Class vehicles only; Argosy/Century service clusters include air
pressure gauges.
2. Remove the air pressure gauges from the old cluster and install them in the service cluster. For instructions,
see the Business Class Trucks Service Manual, Section 54.17, Subject 110.
3. Remove the telltales from the top row of the old cluster and install them in the same places in the service
cluster. Using a pair of needlenose pliers or a similar tool, grab the exposed tab at the top of the telltale slot
(from the back) and carefully pull the telltale out from the top of the ICU. Install telltales in the service cluster by sliding them into the appropriate slot of the service cluster from the top.
4. Install the service cluster into the dash. For instructions, see the Business Class Trucks Service Manual,
Section 54.17, Subject 100.

Argosy/Columbia
See the Century Class Trucks Workshop Manual, Section 54.20, for complete information about the ICU3 (Instrumentation Control Unit, Level I).

Freightliner Service Bulletin, September 2005

Page 3

54-122
Freightliner
Service Bulletin

ICU3 Service Cluster Available
FLA COE
FLB COE
FLD Conventional
> Business Class

FLC 112 Conventional
> Century Class Conventional
> Argosy COE
Cargo

> Columbia
Condor
Coronado
Business Class M2

CAUTION
Electronic components of the level I ICU (ICU3) are vulnerable to damage from static electricity. If available, wear a wrist grounding strap connected to a ground in the cab or workbench. If a grounding strap
is not available, touch a grounded component immediately before doing any work which could bring a
tool or body part in contact with level I ICU circuitry.
Use the following work instructions to replace the ICU3 cluster:
1. Remove the old cluster from the dash. For instructions, see the Century Class Trucks Workshop Manual,
Section 54.20, Subject 100.

NOTE: Air pressure gauges are included with Argosy/Columbia service clusters. It is not necessary to
replace them.
2. Remove the telltales from the top row of the old cluster and install them in the same places in the service
cluster. Using a pair of needlenose pliers or a similar tool, grab the exposed tab at the top of the telltale slot
(from the back) and carefully pull the telltale out from the top of the ICU. Install telltales in the service cluster by sliding them into the appropriate slot of the service cluster from the top.
3. Install the service cluster into the dash. For instructions, see the Century Class Trucks Workshop Manual,
Section 54.20, Subject 100.

Summary
In summary:
• Use the part number information in Table 1 to order the correct ICU3 service cluster.
• If necessary, order replacement air pressure gauges, lamps, or telltales by their individual part numbers.
• Remove the old ICU3 cluster.
• For Business Class vehicles only, carefully remove the air pressure gauges, if any, from the old cluster
and install them in the new service cluster.
• Remove telltale lenses from the old cluster and install them in the new service cluster.
• Install the replacement service cluster.

Parts
Parts are available through the PDCs.

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

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Freightliner Service Bulletin, September 2005