122SD and Coronado Virtual Technician Retrofit
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

54-268
Freightliner
Service Bulletin

Description of Revisions: This bulletin replaces the version dated
August 2016. The changeover date is included in Table 1.

General Information
IMPORTANT: This bulletin applies to EPA10, EPA13, GHG14 vehicles with Detroit™ DD13, DD15 and
DD16 engines.
The Virtual Technician (VT) HU generates diagnostic information to aid the Detroit Customer Support Center
and the technician in diagnosing vehicle fault issues. The system creates sensor log files, captures fault codes,
and sends alert messages and other advanced diagnostic information to the Detroit Customer Support Center.
The VT utilizes GPS navigation, GSM (cellular telephone) communication, and a J1939 connection for databus
monitoring. Virtual Technician does not require any driver input to function.
The VT is located behind the sunglass holder on the passenger side of the overhead console, and is mounted
to a bracket with hook and loop tape.

Parts
See Table 1 for the kit used in this procedure.
Kit
Kit Number

Description (IMACS)

A66-05597-000

KIT-VIRT TECH,RR/XT,24U

A66-05599-000

KIT-VIRT TECH,MR/DC,24U

A66-05598-000

KIT-VIRT TECH,RR/XT,24U

A66-05600-000

KIT-VIRT TECH,MR/DC,24U

Description
Coronado, Raised Roof and XT Roof Sleepers, vehicles built
before January 1, 2016.
Coronado, Day Cab and Mid Roof Sleepers, vehicles built
before January 1, 2016.
Coronado, Raised Roof and XT Roof Sleepers, vehicles built
January 1, 2016, and later.
Coronado, Day Cab and Mid Roof, vehicles built January 1,
2016, and later.
Table 1, Kit

Installation Instructions
1. Park the vehicle on a level surface, shut down the engine, and set the parking brake. Chock the rear tires.
2. Install the power and ground wiring.
2.1

Disconnect the negative cables from the batteries.

2.2

Remove the dash panels, the trim pieces, and any other devices or panels necessary for harness
routing. Refer to the Coronado Workshop Manual for instructions.

2.3

Access the ground and ignition splice packs, located behind the lower center dash.

2.4

Remove the ground and ignition splice pack lock and insert the wires from A06-81737-000.

2.5

Insert the pink wire 81C from the A06-81737-000 harness to the ignition splice pack. Use any
available cavity.

2.6

Insert the black ground wire from the A06-81737-000 harness in the ground splice pack. Use any
available cavity.

Freightliner Service Bulletin, December 2016

Page 1

54-268
Freightliner
Service Bulletin

122SD and Coronado Virtual Technician Retrofit
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

2.7

Route the power wire 433 on the A06-81737-000 harness behind the dash to the bulkhead
connector.

2.8

Remove the white bulkhead connector on the frontwall.

2.9

Remove the connector locks and insert the green wire 433 from the A06-81737-000 harness in
cavity 37 (or any available cavity).

2.10

Insert the green wire 433 of the A06-81778-000 harness in cavity 37 (or the corresponding cavity
from previous step) of the engine-side bulkhead connector.

2.11

Insert the other end of green wire 433 from the A06-81778-000 harness in PNDB cavity 3.

2.12

Install both sides of the bulkhead connector on the frontwall. Connect the bulkhead connector.

3. Install the J1939 harness.
3.1

Tape the two loose wires on the end of the A06-82302-000 harness, near the 2-pin J1939 backbone
connectors. Make sure that the wires are insulted from contacting each other or other components.
These wires are not used.

3.2

Remove the 120-ohm terminating resistor from the J1939 backbone connector, located behind the
center of the lower dash panel near the CPC.

3.3

Install the 120-ohm terminating resistor to the 2-pin male connector on the A06-82302-000 harness.

3.4

Connect the female connector from the A06-82302-000 harness to the backbone connector where
the 120-ohm terminating resistor was originally removed.

3.5

Route the A06-81737-000 and A06-82302-000 harness assembly across the dash to the passengerside floor, then along the passenger door sill plate to the base of the B-pillar.

3.6

Release the red terminal lock from the 8-pin connector of harness A06-81737-000.

3.7

Insert one of the J1939 circuit pairs from harness A06-82302-000 into cavities 4 and 5 of the 8-pin
connector of harness A06-81737-000 with the yellow wire in cavity 4 and the green wire in cavity 5.

3.8

Insert the other J1939 circuit pair into cavities 6 and 7 of the 8-pin connector of A06-81737-000 with
the yellow wire in cavity 6 and the green wire in cavity 7. Push the red terminal lock back into the
connector.

3.9

Connect the male 8-pin connector from the A06-82881-000 harness (A06-82881-001 for EP16
vehicles) to the female 8-pin connector from A06-81737-000 at the base of the passenger-side
B-pillar.

3.10

Route the A06-82881-000 harness assembly (-001 for EP16 vehicles) up the passenger-side B-pillar
and across the top of the passenger door towards the overhead console.

3.11

Connect the male 8-pin connector from the A06-82879-000 harness (A06-82879-001 for EP16
vehicles) to the female 8-pin connector from the A06-82881-000 harness (-001 for EP16 vehicles).

3.12

Route the A06-82879-001 harness assembly (-001 for EP16 vehicles) through the overhead console
to the overhead compartment behind the passenger sunglass holder where the virtual technician
module will be installed.

3.13

Secure all new wiring with cable ties at approximately 12 inch (30 cm) intervals.

Page 2

Freightliner Service Bulletin, December 2016

54-268

122SD and Coronado Virtual Technician Retrofit
FLA COE
FLB COE
FLD Conventional
Business Class
FLC 112 Conventional

Century Class Conventional
Argosy COE
Cargo
Columbia

Freightliner
Service Bulletin

> 122SD and Coronado
Business Class M2
Cascadia
108SD/114SD

4. Install the GPS antenna. See Table 2 for instructions based on the vehicle configuration.

Name

Color

Datalink1

Red

Datalink2

Red and
Green

Diagnostic LEDs
Function
Red Flash (1Hz): J1708
connectivity (disabled). No
J1708 activity detected
(device is awake). Device is
not wired for J1708
connectivity.
Red Flash (1Hz): J1939
connectivity. No J1939
activity detected (device is
awake).
Green Flash (1Hz): J1939
activity detected (device is
awake) .
Solid: GSM connection
successful.
One Flash: Initializing.

Cellular

GPS

Amber

Green or
Amber*

Two Flashes: Acquiring
time zone information.

Action

Red is the normal and
expected state.

Green flash is expected
with the ignition ON; if the
LED is flashing red,
diagnose J1939
connectivity issue.

Solid is expected – if
otherwise call the Customer
Support Center for further
instruction.

NOTE: The VT must be in
Three Flashes: Attempting a network service area.
to make a GSM connection.
Solid: Satellites acquired.
Refer to J1939 Fault codes
One Flash at 1 Hz:
if a problem is suspected.
Acquiring satellites.
Solid: Engine running.
One Flash at 1 Hz: Engine
not running; no data to
send.

Status

Green

Refer to J1939 Fault codes
Two Flashes at 1 Hz: Data if a problem is suspected.
is available to be sent.
Four Flashes at 1 Hz: GPS
storage log is full.

* Lamp is colored green when an external GPS antenna is used. The lamp is amber when the unit is using the
internal GPS antenna.

Table 2, Diagnostic LEDs

5. Install the Virtual Technician HU.
5.1

Record the GPS ID, VIN, and ESN from the label on the back side of the new Virtual Technician HU.

5.2

Remove the passenger-side sunglass holder.

5.3

Connect the 4-pin connector from the A06-82879-001 (A06-82879-000 for pre-EP16 vehicles)
harness to the VT.

Freightliner Service Bulletin, December 2016

Page 3

54-268

122SD and Coronado Virtual Technician Retrofit

Freightliner
Service Bulletin

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

5.4

Connect the 10-pin connector from the A06-82879-001 (A06-82879-000 for pre-EP16 vehicles)
harness to the VT.

5.5

Screw on the GPS antenna cable to the threaded GPS label connection.

5.6

Use hook and loop tape to adhere the VT to the overhead console.

6. Verify the installation of the Virtual Technician HU.
6.1

Connect the batteries.

6.2

If no LEDs light up with the ignition ON, diagnose supplied power and ground to the unit. See Fig. 1
and Table 3. There are seven LEDs visible on the VT module. Start the vehicle and drive to an open
area, at least 40 feet (12 meters) away from any buildings. Park the vehicle and keep the ignition in
the ON position. Apply the parking brake.

6.3

Call the Detroit Customer Support Center. Make sure to have the vehicle serial number and the
Virtual Technician GPS ID number available so that the new VT can be registered.

6.4

Install the sunglass holder in overhead console.

6.5

Install the instrument cluster, the trim piece from around front side of the dash, the top dash cover
panel, the passenger-side dash cover, and any other devices or panels necessary for harness
routing.

DATALINK1
DATALINK2

CELLULAR
GPS
STATUS

03/18/2014

f546075

Fig. 1, Virtual Technician HU LEDs

Page 4

Name

Color

DL1

Red

Diagnostic LEDs
Function
Action
Red Blink (1Hz): J1708
connectivity (disabled). No
J1708 activity detected
Red is the normal and
(device is awake). Device is expected state.
not wired for J1708
connectivity.

Freightliner Service Bulletin, December 2016

54-268

122SD and Coronado Virtual Technician Retrofit
FLA COE
FLB COE
FLD Conventional
Business Class
FLC 112 Conventional

Century Class Conventional
Argosy COE
Cargo
Columbia

Name

DL2

Color

Red and
Green

Diagnostic LEDs
Function
Red Blink (1Hz): J1939
connectivity. No J1939
activity detected (device is
awake).
Green Blink (1Hz): J1939
activity detected (device is
awake) .
Solid: GPS connection
successful.
One Blink: Initializing.

GSM

GPS

Green

Green

Freightliner
Service Bulletin

> 122SD and Coronado
Business Class M2
Cascadia
108SD/114SD

Two Blinks: Acquiring time
zone information.

Action
Green blink is expected, if
LED is blinking red
diagnose J1939
connectivity issue at the
terminals.

Solid is expected – if
otherwise call the Customer
Support Center for further
instruction.

NOTE: The VT must be in
Three Blinks: Attempting to a 2G network service area.
make a GPS connection.
Solid: Satellites acquired.
Refer to J1939 Fault codes
One Blink: Acquiring
if a problem is suspected.
satellites.
Solid: Engine running.
One Blink: Engine not
running; no data to send.

Status

Green

Two Blinks: Data is
available to be sent.

Refer to J1939 Fault codes
if a problem is suspected.

Four Blinks: GPS storage
log is full.
Solid: GSM Modem Comm.
Error, or panic line is active.
Two Blinks: Not Used.
AUX

Tamper

Red

Red

Three Blinks: GSM modem
Refer to J1939 Fault codes
is not starting up.
if a problem is suspected.
Four Blinks: SIM Card
read error.
Five Blinks: GSM CTS
(clear-to-send) line is active.
Disabled

N/A

Table 3, Diagnostic LEDs

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

Freightliner Service Bulletin, December 2016

Page 5