Mounting Location On The Trailer; Mounting Orientation & Accuracy; Ecu Orientation Requirements; Recommended Ecu Mounting Hardware - Bosch Dexter Tow Assist Installation Manual

Mounting Location on the Trailer

The recommended mounting location for the ECU is shown below:
Trailer Y-Axis
ƒ As close as possible to the centerline of the trailer, +/- 1 foot is
allowed. Midway between the left and right wheels.
Trailer X-Axis
ƒ On a chassis rail which is closest to all the braked wheels. For
example, locate the ECU nearest the axle for a single axle trailer,
in between the axles on a tandem axle trailer and over the
center axle on triple axle trailer.
ƒ Locate the ECU on the backside of the chassis rail or designated
mounting structure. Orient the universal mounting bracket
supplied on the ECU towards the front of the trailer. The Tow
Assist product label should point towards the back of the trailer.
Trailer Z-Axis
ƒ Vertical mounting position should locate the ECU as close to the
floor as possible to ensure adequate protection. IMPORTANT: THE
Universal Mounting Bracket SHOULD NOT CONTACT THE FLOOR.
Other mounting locations on the trailer are possible as long as they
meet the mounting example requirements and axle harness limits. On
a multi-axle installation, do not mount the ECU behind the rear axle as
the increased vibration may result in performance issues.
Mounting Orientation & Accuracy
Tow Assist mounting orientation must be strictly adhered to, any
deviation from these instructions may result in reduced system
performance. The ECU must be mounted in the same manner as the
figure below.
TRAILER FLOOR/DECK
FRONT
X-AXIS
Y-AXIS
TRAILER
CHASSIS
Z-AXIS
RAIL
View: From left trailer wheel to
right trailer wheel.

ECU Orientation Requirements

ƒ The ECU must be mounted perpendicular to the ground.
This vertical orientation (Z-Axis) should be with the harness
connectors facing downward.
2021.01 | 4
X-AXIS
Z-AXIS
View: Looking toward the front of the
trailer.
ƒ The ECU should be mounted so the top edge of the Universal
Mounting Bracket is parallel to the chassis or carrying surface
of the unit. When mounted on a finished unit this should place
the X and Y axis no more than ±5° from parallel to the ground.
NOTE: THE Universal Mounting Bracket SHOULD NOT CONTACT
THE FLOOR. Allowance of 1/8" air gap is appropriate to avoid
transmission of unwanted vibration.
ƒ The mounting location should allow for proper clearance of
the axle and power harness connections as well as mounting
hardware. Upon installation, the ECU and harness connections
should not receive contact from external materials from the unit.
ƒ Variation from the recommended tolerances and requirements
for mounting the ECU may result in malfunction.
ƒ In general, the best performance and robustness is achieved
when the bracket is mounted with minimum tolerance.
Exceeding the tolerances of these mounting requirements may
result in poor performance or malfunction.

Recommended ECU Mounting Hardware

The recommended mounting hardware is a #12-14 x 1", Hex Flange
Head screw. There are 4 mounting screws provided with the install
kit, (Dexter part number 007-585-00). The supplied screw should be
torqued to 4.4 ± 1 ft lbs (6 ± 1.5 Nm) to ensure secure mounting to
the chassis rail.

Recommended ECU Mounting Technique

Upon determining the proper location and orientation, the final
attachment is important. The Tow Assist install kit is supplied with
hardware appropriate to attach the ECU to light gauge steel. All
four holes should be pre-drilled to avoid shift during installation.
Alternative frame materials may require hardware not supplied in the
kit. Doing so is considered acceptable if fasteners meet or exceed
those supplied with the kit. All four attachment points should be used
during installation. NOTE: DRILLING OR WELDING OF THE UNIVERSAL
MOUNTING BRACKET IS NOT ALLOWED. THERE IS A MOUNTING
TEMPLATE AT THE BACK OF THIS MANUAL.
ECU Mounting Holes
Please see the ECU Mounting Template on page 15.
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Y-AXIS
TOW ASSIST
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