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Technical Service Bulletin
Release Date: 07/11/2026
Bulletin Title: Fleet Maintenance
Description: Service action for removing CAN Bus resistors, cleaning & preventing DC to DC converter 12volt cable corrosion, improving the location and visibility of the First Responders Cut Loop Labels, and
improving the Motor Control Unit (MCU) high voltage cable dual clamp cable-ties locations.
Bulletin Number: TSB-725-01

Affected Vehicle & Model Information
Make: Bollinger
Model: B4
Year: 2025
Production Date Range: N/A
VIN(s):
7WE45CN57SL000038
7WE45CN52SL000058
7WE45CN52SL000044
7WE45CN51SL000052
7WE45CN59SL000025
7WE45CN50SL000057
7WE45CN59SL000056
7WE45CN58SL000047
7WE45CN54SL000045
7WE45CN57SL000041
7WE45CN52SL000013
7WE45CN53SL000019

7WE45CN52SL000027
7WE45CN5XSL000034
7WE45CN58SL000033
7WE45CN50SL000060
7WE45CN53SL000022
7WE45CN50SL000043
7WE45CN59SL000039
7WE45CN53SL000053
7WE45CN53SL000070
7WE45CN57SL000024
7WE45CN54SL000014
7WE45CN57SL000030

7WE45CN55SL000040
7WE45CN55SL000023
7WE45CN55SL000054
7WE45CN57SL000069
7WE45CN55SL000071
7WE45CN59SL000073
7WE45CN57SL000055
7WE45CN56SL000046
7WE45CN59SL000042
7WE45CN57SL000072
7WE45CN58SL000016
7WE45CN56SL000029

7WE45CN57SL000033
7WE45CN57SL000035
7WE45CN57SL000036
7WE45CN57SL000037
7WE45CN5XSL000034
7WE45CN52SL000027
7WE45CN5XSL000020
7WE45CN54SL000028
7WE45CN50SL000026
7WE45CN58SL000002
7WE45CN5XSL000020

Subject:
• Controller Area Network (CAN) termination enhancement, ensuring optimal CAN BUS stability.
• Inspection of the DC to DC converter 12-volt connection and removal of the dust cover.
• Repositioning the First Responders flag ensures maximum visibility and improved placement.
• Improving the position of the MCU high voltage cable dual clamping cable-ties.
Symptom:
• CAN BUS instability.
• Potential corrosion of the DC to DC Converter 12-Volt power cable due to dust cover orientation.
• Improved location of the First Responders Cut Loop Label.
• Improved the MCU high voltage cable dual clamp cable-tie position.

Disclaimer and Confidentiality Notice
These bulletins are intended solely for use by professional technicians with the appropriate training, tools, and safety knowledge to perform service and
maintenance accurately and safely. They provide essential information on potential conditions that may affect specific vehicles or offer guidance for correct

2
Discussion:
• To reduce CAN instabilities, three termination resistors should be removed, which will bring the overall
bus resistance closer to the target of 60 ohms.
• The dust cover orientation for the DC to DC Converter 12-volt cable connection may trap debris and
moisture, which could lead to corrosion and result in a poor connection.
• Improving the location of the First Responders Cut Loop Labels.
• Improving the location of the MCU high-voltage dual clamp cable ties.

Labor & Parts Information
Labor Operation:
A. CAN Bus Resistor Removal – 3 Resistors in total
• Removing Resistors
• Removing the Grille
B. Removal of the terminal cap, Inspection of the 12-volt terminal (DC to
DC Converter), and applying corrosion inhibitor (battery terminal
protectant)
• Removal of terminal cap, cleaning, & applying battery terminal protectant
• DC to DC Converter Shield Removal
• DC to DC Converter Shield Installation
C. Remove and replace the First Responder Cut Loop Labels and secure
in the improved locations
D. MCU High Voltage Cable Dual Clamp Cable-Tie, Improved Position

Labor
Operation
Code

Labor
Operation
Time

1015.1060
1765.1060

.2 hour
.3 hour

1015.1060
1015.1060
1015.1060

.2 hour
.2 hour
.2 hour

1015.1060

.2 hour

1015.1060

.2 hour

Labor Time Allocation: Total – 1.5 hours
Parts / Kits Required, Included and Provided:
Quantity Part / Kit Number Part Group Name
1
S129205A
Service Kits

Description
Fleet Maintenance Kit

Parts Included in Kit:
Quantity Part / Kit Number
3†
S129097A
3†
S116577A
3†
S096425A

Description
Electrical seal cap for CAN termination locations
Emergency First Responders Cut Label
Dual Clamp Cable Tie

Part Group Name
Electrical / Wiring
Labels
Electrical / Wiring

† Note: 1 extra item included

Parts NOT Included in Kit:
Quantity Part / Kit Number
1

Corrosion Spray

Description
DC to DC 12-volt cable dust cap removal, inspection, cleaning & corrosion
treatment. Corrosion spray from dealer shop supplies; reimbursement
provided in labor time calculation.

Disclaimer and Confidentiality Notice
These bulletins are intended solely for use by professional technicians with the appropriate training, tools, and safety knowledge to perform service and
maintenance accurately and safely. They provide essential information on potential conditions that may affect specific vehicles or offer guidance for correct

3

Bulletin Repair Procedure Details

WARNING: THE HIGH VOLTAGE DISABLING PROCEDURE MUST BE COMPLETED BEFORE PERFORMING ANY
WORK ON, WITH, OR IN PROXIMITY TO ANY HIGH VOLTAGE COMPONENT, CABLE, OR CONNECTION.
COMPLIANCE WITH ALL APPLICABLE PERSONAL PROTECTIVE EQUIPMENT ("PPE") REQUIREMENTS AND
PRESCRIBED SAFETY PROCEDURES IS MANDATORY.

Disclaimer and Confidentiality Notice
These bulletins are intended solely for use by professional technicians with the appropriate training, tools, and safety knowledge to perform service and
maintenance accurately and safely. They provide essential information on potential conditions that may affect specific vehicles or offer guidance for correct

4

A. CAN Bus Resistor Removal – 3 Resistors in total.
Resistor locations:

Resistor 1:
1. Locate and remove the CAN termination resistor. This resistor is located near the rear of the vehicle
underneath the MCU, as indicated by the orange arrow below. Press the release tab on the wire
harness side of the connector to detach the resistor. Once removed, dispose of the resistor properly.

Disclaimer and Confidentiality Notice
These bulletins are intended solely for use by professional technicians with the appropriate training, tools, and safety knowledge to perform service and
maintenance accurately and safely. They provide essential information on potential conditions that may affect specific vehicles or offer guidance for correct

5
2. Replace the resistor with the provided cap to protect the connector.

Resistor 2:
1. Locate and remove the CAN termination resistor. This resistor is located in front of the vehicle and
behind the grille. The grille must be removed to access the resistor. This can be accomplished by
removing the three 10 mm bolts and disengaging the nine pushpins as indicated below.

2. Once the CAN termination resistor is accessible, verify that the white ID reads "Resistor Chassis CAN”.
Remove the tape securing the connector and press the release tab on the wire harness side of the
connector to detach the resistor from the harness. Once removed, dispose of the resistor properly.

Disclaimer and Confidentiality Notice
These bulletins are intended solely for use by professional technicians with the appropriate training, tools, and safety knowledge to perform service and
maintenance accurately and safely. They provide essential information on potential conditions that may affect specific vehicles or offer guidance for correct

6

3. Next, replace the resistor with the provided cap to protect the connector. Using electrical tape, safely
secure the harness takeout to prevent damage to the harness.

Disclaimer and Confidentiality Notice
These bulletins are intended solely for use by professional technicians with the appropriate training, tools, and safety knowledge to perform service and
maintenance accurately and safely. They provide essential information on potential conditions that may affect specific vehicles or offer guidance for correct

7

Resistor 3:
1. Locate and remove the CAN termination resistor (Figure 1). This resistor is located on the driver’s side
of the interior cab, near the OBD port. Resistor 3 is grey, as opposed to resistors 1 and 2, which are
black. Resistor 3 will have electrical tape wrapped around it. Carefully remove the electrical tape and
disconnect the grey resistor from the white electrical connector.

Figure 1 - Location of CAN resistor

Figure 2 - New Cap – Top and Bottom View
2. Press the release tab on the wire harness side of the connector to detach the resistor from the harness.
Once removed, dispose of the resistor properly.
3. Next, replace the resistor with the provided cap to protect the connector (Figure 2). Using electrical
tape, safely secure the harness takeout back to the harness. Please use the images above for
reference.

Disclaimer and Confidentiality Notice
These bulletins are intended solely for use by professional technicians with the appropriate training, tools, and safety knowledge to perform service and
maintenance accurately and safely. They provide essential information on potential conditions that may affect specific vehicles or offer guidance for correct

8

B. Removal of the terminal cap, Inspection of the 12-volt terminal (DC to DC Converter),
and applying corrosion inhibitor (battery terminal protectant)

Note: Refer to the HIGH VOLTAGE DISABLING PROCEDURE found on page 3 of this technical bulletin before
performing any service or repair.
1. Remove the shield cover in front of the DC to DC converter. Use a 13mm socket or wrench to remove
the five fasteners securing the cover, then remove the cover from the vehicle. Reference the images
below.

Note: After removing the cover, the DC to DC converter will be visible from under the vehicle.

Disclaimer and Confidentiality Notice
These bulletins are intended solely for use by professional technicians with the appropriate training, tools, and safety knowledge to perform service and
maintenance accurately and safely. They provide essential information on potential conditions that may affect specific vehicles or offer guidance for correct

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2. Locate the red plastic terminal cover shown below. This cover can be easily removed by pulling it away
from the DC to DC converter. A small wire tether connects the red plastic terminal to cover the DC to
DC Converter. Cut the tether close to the tether crimp to detach the protective cover entirely from the
vehicle. Reference images below.

Disclaimer and Confidentiality Notice
These bulletins are intended solely for use by professional technicians with the appropriate training, tools, and safety knowledge to perform service and
maintenance accurately and safely. They provide essential information on potential conditions that may affect specific vehicles or offer guidance for correct

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3. After carefully removing and discarding the cover, take a moment to inspect the connection for any
signs of corrosion. If you notice corrosion, remove the fastener and, for best results, use a soft to
medium wire brush to clean both the fastener and the terminal thoroughly. Handle everything with care
to avoid causing damage.
Example – DC to DC connection with protective cover removed

4. Apply terminal corrosion protection to the connection, such as CRC Battery Terminal Protection spray
or equivalent. Reassemble and torque the DC to DC Converter cable fastener to 18 Nm (13 ft-lbs.).
Reapply & treat the bolt and eyelet with the battery terminal protection spray.

Disclaimer and Confidentiality Notice
These bulletins are intended solely for use by professional technicians with the appropriate training, tools, and safety knowledge to perform service and
maintenance accurately and safely. They provide essential information on potential conditions that may affect specific vehicles or offer guidance for correct

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5. Reinstall the DC to DC Converter cover/shield, ensuring all five fasteners are correctly installed and
secured to the correct torque of 21 Nm (15.5 ft-lbs.). DC to DC Converter repair is now complete.

Disclaimer and Confidentiality Notice
These bulletins are intended solely for use by professional technicians with the appropriate training, tools, and safety knowledge to perform service and
maintenance accurately and safely. They provide essential information on potential conditions that may affect specific vehicles or offer guidance for correct

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C. Remove and replace the First Responder Cut Loop Labels and secure them in the
improved locations.
Note: Refer to the HIGH VOLTAGE DISABLING PROCEDURE found on page 3 of this technical bulletin
before performing any service or repair.
1. Locate the First Responders Cut Loop Labels, use the image below as a reference.

2. Using a pair of scissors, carefully remove the labels and discard them.
Note: Do not use razor blades or “box cutter knife” like tools. If used, there is a risk of
damaging the wire loom sleeve or wiring insulation.

Disclaimer and Confidentiality Notice
These bulletins are intended solely for use by professional technicians with the appropriate training, tools, and safety knowledge to perform service and
maintenance accurately and safely. They provide essential information on potential conditions that may affect specific vehicles or offer guidance for correct

13
3. Place new labels at the two locations, highlighted below, using the first responder cut loop labels
provided. The first label should be placed on the High Voltage Battery Crash Line, a small bundle of
wires that run along the frame rail and then lead into the 12-Volt Shutoff box. (Figures 1 & 2)
4. The second label should be placed on the negative battery cable before it connects to the battery
(Figure 3)

Figure 1

Figure 2

Figure 3

Disclaimer and Confidentiality Notice
These bulletins are intended solely for use by professional technicians with the appropriate training, tools, and safety knowledge to perform service and
maintenance accurately and safely. They provide essential information on potential conditions that may affect specific vehicles or offer guidance for correct

14

D. MCU High Voltage Cable Dual Clamp Cable-Tie, Improved Position
Note: Refer to the HIGH VOLTAGE DISABLING PROCEDURE found on page 3 of this technical bulletin
before performing any service or repair.
Dual Clamp Cable -Ties are installed in the incorrect position shown in the red box. The dual clamp tie shall be
in the green box (Figure 1). Top View (Figure 2), Bottom View)
Inspect the dual clamp tie position. If dual clamp ties are already in the correct position, there is no need to
proceed to the next step.
1. Install a Dual clamp tie (BoMo Service PN - S096425A, Supplier Hellerman Tyton: PN 115-31100) at the
location shown in the green box.
a. Cable #3 dual clamp tie shall be 27 cm (10.5 in.) to 29 cm (11.5 in.) away from the motor retention
bracket.
b. Cable #2 dual clamp tie shall be 30 cm (11.8 in.) to 33 cm (13 in.) away from the motor retention bracket.
c. There should be no movement of dual clamp ties after installation.
2. Remove the dual clamp ties in the red box using a small or pocket-style flat-tip screwdriver to release the
clamp tie locking tab.

Figure 1 – Top View
Disclaimer and Confidentiality Notice
These bulletins are intended solely for use by professional technicians with the appropriate training, tools, and safety knowledge to perform service and
maintenance accurately and safely. They provide essential information on potential conditions that may affect specific vehicles or offer guidance for correct

15

Figure 2 – Bottom View

Post-Repair Actions
1. Verification:
•
•
•

Image verification of DC to DC Converter 12-volt cable cleaned, and spray protectant applied.
Image of First Responder Cut Loop Labels installed in the improved locations.
Image of dual clamp cable ties in the improved positions.

2. Documentation: Images of verification steps provided with the claim, TSB PDF, and repair order as
attached to the warranty claim.
3. Warranty Submission: To submit the warranty, claim for this technical service bulletin, select Dealer
Stock Unit (not PDI) as the Service Type on the claim for all dealer stock units and the Warranty service
type for all non-dealer stock units. Select Complaint, Cause, Corrective Action, and add descriptions.
Attach a copy of the TSB and the repair order to the claim.

Disclaimer and Confidentiality Notice
These bulletins are intended solely for use by professional technicians with the appropriate training, tools, and safety knowledge to perform service and
maintenance accurately and safely. They provide essential information on potential conditions that may affect specific vehicles or offer guidance for correct