Fig. 45, XMC2 X3 Connector Pin Locations

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SF678 A

17.

Move the existing brown wire (circuit 102C) from cavity 6 to cavity 16.
17.1 Use a small flat screwdriver to gently pry up the top of the X3 connector, and unlock the connector,
as shown in Fig. 46.

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Fig. 46, Unlocking the XMC2 X3 Connector

17.2 Remove the brown wire (circuit 102C) from cavity 6 of the X3 connector.
17.3 Insert the brown wire from the harness into the cavity 16 of X3 connector. See Fig. 47.
NOTE: If connecting to the correct XMC (XMC2), then cavity 16 of connector X3 will be empty.

1

2
09/26/2023

1. XMC2 X3 Connector

f548316

2. Cavity 16
Fig. 47, Inserting the Brown Wire into Cavity 16

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SF678 A

17.4 Squeeze the top and bottom of the XMC2 X3 connector to lock it. Reconnect the X3 connector to
XMC2. See Fig. 48.

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Fig. 48, Engaging the Lock on the XMC2 X3 Connector

18.

Orient the XMC2 X2 connector, as shown in Fig. 49. The modular X2 connector has two terminal banks,
one gray (pins 1–26) and one black (pins 27–52). Note the locking tab location for the black terminal bank
(pins 1–26). The black terminal bank has to be removed for the steps that follow.
4

3
09/26/2023

1.
2.
3.
4.

1

2
f548318

Gray Terminal Bank
Black Terminal Bank
Locking Tab Pins 27 to 52
Locking Tab Pins 1 to 26

Fig. 49, XMC2 X2 Connector Terminal Bank and
Locking Tab Location
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SF678 A

19.

Insert a small flat screwdriver in between the locking tab for the black terminal bank and gently pry up on
the black terminal bank until it clears the locking tab. See Fig. 50 .

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f548327

Fig. 50, Releasing the Black Terminal Bank

20.

Once the black terminal bank has cleared the locking tab, use the screwdriver on the opposite end and
push the rest of the way out of the X2 connector. See Fig. 51.

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f548328

Fig. 51, Pushing Out the Black Terminal Bank

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North America LLC

Field Service Campaign

November 2023
SF678 A

21.

Insert the red wire from the harness into cavity 34 of the black terminal bank. See Fig. 52.

1

11/09/2023

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1. Cavity 34
Fig. 52, Inserting the Red Wire into Cavity 34

22.

Insert the black terminal bank back into the XMC2 X2 connector, as shown in Fig. 53.

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Fig. 53, Inserting the Black Terminal Bank into the
XMC2 X2 Connector

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Field Service Campaign

November 2023
SF678 A

23.

Connect the X3, X2, and X1 connectors to the XMC2.

24.

Secure the red and brown wires routed to XMC2 to the existing dash harness using zip ties as needed.
Follow Daimler routing and clipping standards.

25.

Follow the substeps to route the orange (or pink) wire to the internal VPDM, and terminate the wire in the
J4 VPDM connector.
NOTE: The wire that gets routed in these substeps may be orange or pink. The wire in question will originate from the 6-pin connector in the harness and has a terminal on the other end.
25.1 Route the orange (or pink) wire from behind the center dash switch panel to the VPDM connector J4
in the path shown in Fig. 54, Fig. 55, and Fig. 56.

A

1

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f548424

A. Start routing the orange (or pink) wire to the VPDM J4 connector from here, along the existing harness as shown.
1. VPDM
Fig. 54, Routing Path of the Orange (or Pink) Wire from Behind the Center Dash Switch Panel to the VPDM J4
Connector

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Field Service Campaign

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SF678 A

1
2

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1. Routing Path to the VPDM
2. VPDM
Fig. 55, Routing Path of the Orange (or Pink) Wire in
the VPDM Area

1

2

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1. VPDM J4 Connector
2. VPDM (removed)
Fig. 56, Location of the VPDM J4 Connector, Where the
Orange (or Pink) Wire Terminates

25.2 Secure the orange (or pink) wire, routed to the VPDM in the previous substep, to the main harness
with zip ties as needed.
25.3 Remove the backshell from the J4 VPDM connector.
.

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Field Service Campaign

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SF678 A
25.4 Remove the locks from the VPDM J4 connector, as shown in Fig. 57

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f548334

Fig. 57, Removing the Lock from the VPDM J7
Connector

NOTE: If the cavity B11 (Fuse F6 IGN – Expansion fuse 8) already has a wire installed, use the alternate
pin locations listed in Table 3.
25.5 Insert the orange (or pink) wire into cavity B11 of the VPDM J4 connector. See Fig. 58.
Pin Locations

Fuse Positions

J4/D12
J4/F9

Fuse F11 – Expansion Fuse 15 IGN
Fuse F20 – Expansion Fuse 12 IGN

J4/A11

Fuse F3 – Expansion Fuse 1 IGN

Table 3, Alternate Pin Locations and Fuse
Positions

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Fig. 58, Inserting the Orange (or Pink) Wire into Cavity
B11 of the VPDM J4 Connector

25.6 Install the locks on the J4 connector removed in substep 25.4.
25.7 Install the backshell on the J4 connector.
25.8 Install the VPDM. For instructions, see Section 54.06, Subject 100 of the Business Class M2 Plus
Workshop Manual.
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SF678 A

25.9 Install the 5A fuse (23-12537-005) in the VPDM fuse position F6. See Fig. 59.

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Fig. 59, Installing the 5A Fuse in VPDM Fuse Position F6

NOTE: If the orange (or pink) wire is installed in one of the alternative pin locations other than B11, install
the fuse in the appropriate alternate location listed in Table 3, page 36.
26.

Follow the substeps to route the two white wires and the brown wire from behind the center dash switch
panel to the firewall grommet on the passenger side, under the VPDM.

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SF678 A
NOTE: The brown wire will not be used. The end of it can be folded over and taped to the two white wires,
once routed.
26.1 Route the two white wires and the single brown wire from behind the center dash switch panel to the
passenger side firewall pass-through grommet along the existing harness, as shown in Fig. 60 and
Fig. 61.

A

1
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f548426

A. Start routing the two white wires and the single brown wire to the passenger-side firewall grommet from here, along
the existing harness as shown.

1. Firewall Pass-Through Grommet
Fig. 60, Routing Path of the Two White Wires and Single Brown Wire from Behind the Center Dash Switch Panel to
the Passenger-Side Firewall Pass-Through Grommet

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Field Service Campaign

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SF678 A

A

1
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f548427

A. Routing path of the two white wires and the
single brown wire.

1. Passenger-Side Firewall Pass-Through Grommet
Fig. 61, Routing Path of the Two White Wires and
Single Brown Wire Near the Passenger-Side Firewall
Pass-Through Grommet

26.2 Remove the tape from the firewall pass-through grommet as needed, and pass the two white wires
and the single brown wire through the grommet to the engine side of the firewall.
NOTE: It may be helpful to first pass a large zip tie through the grommet from the engine side, and tape the
three wires to the zip tie, then pass the three wires though the grommet by pulling on the zip tie from the
engine compartment side.
NOTE: The three wires that are passed through the grommet have terminals on the ends. These terminals
will not be used and can be cut off. Do not cut off the labels ‘BH50’ and ‘BH38’ near the terminals. These
labels are needed to correctly splice these wires to harness (TSU CT44FRT034) in a later step.
26.3 Tape the grommet again, as needed.
27.

Install the plow light switch.
27.1 Remove the MSF secondary module, that contains the plow light switch, from the dash. For instructions, see Section 54.12, Subject 110 of the Business Class M2 Plus Workshop Manual.
27.2 Remove the existing plow light switch from the MSF secondary module, and discard it.
27.3 Install the new plow light switch (A66-14104-040) in the same position as the switch removed in the
previous substep.

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Field Service Campaign

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SF678 A
27.4 Locate the 6-pin switch connector on the new harness, and plug it in the new switch. See Fig. 62.
27.5 Install the MSF secondary module with the new plow light switch on the center dash switch panel.
28.

If not already done, secure all the wiring that has been routed to the SSAM, XMC2, VPDM, and firewall
grommet to the existing dash harness using zip ties as necessary. Bundle any excess wiring behind the
center dash switch panel, and secure with zip ties.

29.

On the two white wires that were passed through the firewall grommet in substep 26.2 (TSU CT44FRT033),
cut the terminals off. Be careful not to cut the labels ‘BH50’ and ‘BH38’ near the terminals.

30.

On the two white wires on harness (TSU CT44FRT034) labeled ‘BH50’ and ‘BH38,’ cut the terminals off.
Be careful not to cut the labels ‘BH50’ and ‘BH38’ near the terminals.

31.

Splice the two white wires labeled ‘BH50’ and ‘BH38’ on the harness (TSU CT44FRT033) that was passed
through the firewall grommet to the two white wires labeled ‘BH50’ and ‘BH38’ on the harness
(TSU CT44FRT034). Be sure to match labels ‘BH50’ and ‘BH38’ while splicing. See Fig. 63.

NOTE: For wire splices, use one of the methods outlined in Section 54.00, Subjects 100 and 110 of the Business Class M2 Plus Workshop Manual.

A

C

B

D
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f548411

A. Two white wires from the underhood harness
(TSU CT44FRT034).

B. Two white wires from the inside dash harness
(TSU CT44FRT033).

C. Splice the wire labeled ‘BH38’ to the other wire
labeled ‘BH38.’

D. Splice the wire labeled ‘BH50’ to the other wire
labeled ‘BH50.’
Fig. 63, Splicing the White Wires of the Dash Harness
to the Underhood Harness

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Fig. 62, Connector Plugged into the Back of the Plow
Light Switch

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Daimler Truck
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Field Service Campaign

November 2023
SF678 A

32.

Wrap any remaining exposed wiring that was passed through the firewall grommet with fabric tape.

33.

Route the harness (TSU CT44FRT034) towards the front of the vehicle to the existing plow light connector(s) along existing harnesses in the path shown in Fig. 64 and Fig. 65. Secure the harness with zip ties
as needed.

NOTE: The vehicle configurations may vary. Route the new harness along the existing harnesses or airlines as
best as possible.

A

1

A

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f548428

A. Harness path from the firewall grommet.
Fig. 64, Harness Path from the Firewall Grommet
Towards the Left-Hand Frame Rail

2
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f548429

A. Routing path of the harness to the plow light
connectors.

1. Driver-Side Plow Light Connector
2. Passenger-Side Plow Light Connector (if so
equipped)
Fig. 65, Harness Path Along the Left-Hand Frame Rail

34.

Determine if the vehicle has a single plow light connector or dual plow light connectors.

NOTE: The typical plow light connector locations are shown in Fig. 65. For single plow light configuration, the
connector is located on the driver’s side. For dual plow light configuration, the connectors are located on both
the driver’s side as well as the passenger’s side. Other locations in this general vicinity may be possible.

Page 41

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Field Service Campaign

November 2023
SF678 A
NOTE: For dual connector interface, skip this step, and go to step 36.
35.

For single plow light connector interface:
35.1 Remove the cover and lock from the plow light interface connector. See Fig. 66, Fig. 67, and Fig. 68.

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f548412

Fig. 66, Plow Light Interface Connector with the Cover
Installed

11/03/2023

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f548413

Fig. 67, Plow Light Interface Connector with the Cover
Removed

f548414

Fig. 68, Plow Light Interface Connector with the Lock
Removed

Page 42

Daimler Truck
North America LLC