Professional Distributor - 40

DIAGNOSTIC TECH

Fig. 2 - Erratic relative speed and distance from
a defective radar sensor, outlined in red, indicate
sensor damage.

removing and installing or replacing the distance sensor for intelligent
cruise control (ICC). As mentioned
earlier, these sensors are very sensitive and most include a large warning
label stating not to drop the sensor, as
shown in Fig. 1.
Most component manufacturers
state that if the unit is dropped, it
should be scrapped and replaced. It is
important to keep this in mind when
performing such services. For instance,
a technician may find themselves performing a radar calibration as a sublet
for a body shop. They should be asking
themselves, "Why am I calibrating this
sensor?" If the reason for calibration
was due to a collision, the technician
may want to consider requesting a
new sensor.
It is possible that a vehicle could
have been involved in a collision without the sensor sustaining any visible
damage. I have observed radar sensors
that appeared normal but presented
difficulties or were impossible to calibrate, ultimately requiring the sensor

to be replaced. I've also seen sensors
opened for inspection revealing internal damage.
Keep in mind that the service
information may require that the vehicle undergo a proper wheel alignment
with the thrust angle set to zero. When
preparing for an alignment on a vehicle
with ADAS, the technician needs to
ensure that the vehicle is placed on a
level surface and meets all other vehicle
preconditioning states as outlined in
the service information.
Here are a few tips that may be useful when tasked with ADAS calibration:
*	 Always perform a full vehicle scan
for diagnostic trouble codes (DTCs)
and make sure that all of the modules the vehicle is supposed to be
equipped with are reporting. Some
aftermarket scan tools may only
show modules currently present
on the bus system.
*	 Scan the system(s) and data parameters and record them. For forwardfacing radar, pull up the distance
and relative speed parameters and
place them in graphing mode. Have
an assistant ride along and observe
the data while following other
vehicles. If a very erratic signal

40 Professional Distributor I February 2020 I VehicleServicePros.com

is observed, this is indicative of a
damaged sensor. Fig. 2 illustrates
the performance of a damaged sensor. It is recommended that technicians scan several vehicles in order
to gain knowledge and awareness
of what's normal and what's not.
*	 When parking the vehicle in the
bay, have the scan tool connected
with the steering wheel angle
data parameter displayed and set
the steering wheel to achieve a
0-degrees reading.
*	 A battery maintainer is strongly
recommended to ensure the system
voltage stays in a safe range.
The radar alignment process
involves a reflector plate to be placed
front, center, and square to the center
line of the vehicle. Additional special tools, such as a leveling laser, are
required in order to establish the center
line of the vehicle relative to the rear
wheels (thrust angle). You'll find that
the setup process is usually the biggest
challenge. However, after performing
several calibrations, technicians should
find their efficiency improving greatly.
With the vehicle on a level surface and the alignment plate placed
in its exact position, a scan tool will
be used to request that the vehicle's
onboard systems execute an alignment
calibration cycle. Once the request has
been made, the system will establish
its offsets based on the radar returns
from the calibration plate. It is essential for technicians to take the time to
set up the calibration tools properly. If
everything is set up correctly and the
onboard systems are in good health,
the scan tool should report that the
alignment is in progress followed by
an indication that the alignment has
been completed. Once complete, the
technician should observe the following parameter identification data
(PIDs) and check them against reference values:
*	 Vertical angle - radar angle
*	 Vertical angle - measurement result


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Professional Distributor

Table of Contents for the Digital Edition of Professional Distributor

On the Road to Cool Profits
Show Me Your Truck
In Focus Products
Driving Sales
Editor's Note: 2020 and Beyond
Most Wanted
Sneak Peek
Go Sell Something: Make the Most of This Year's Trade Show Season
Diagnostic Tech: Calibrating Forward-facing Radar Sensors
Tales From the Road: Bundle, Tote and Grow
Hand & Specialty Tools Supplement
Specialty Hand Tools: The Problem Solvers
Time to Multitask
Get a Hold on Hand Tool Safety
Electric Vehicle Tool Set
Tool Reviews
Products
M Eagles Tool Warehouse insert
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Professional Distributor - 2
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Professional Distributor - Editor's Note: 2020 and Beyond
Professional Distributor - 5
Professional Distributor - On the Road to Cool Profits
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Professional Distributor - Show Me Your Truck
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Professional Distributor - Most Wanted
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Professional Distributor - Sneak Peek
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Professional Distributor - Go Sell Something: Make the Most of This Year's Trade Show Season
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Professional Distributor - Diagnostic Tech: Calibrating Forward-facing Radar Sensors
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Professional Distributor - Tales From the Road: Bundle, Tote and Grow
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Professional Distributor - Hand & Specialty Tools Supplement
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