october2023 - 43
network. With GM's circuit, a technician can truly assess total
wiring integrity by leveraging terminating resistors where some
other manufacturers are different.
For example, Volkswagen Audi Group (VAG) will utiFigure
5 - Body controller Pass-Thru network
Photo from Tesla
greatly enhancing the decision-making processes to come.
Your front office staff should always be questioning your
clients for clues that might prove to
be useful. I have an example to share
with you later in this article about a
scan tool that induced a communication
fault (U0235) that stayed active
even after the tool was disconnected.
HSCAN CIRCUIT BASICS
Not all HSCAN networks are the same,
but they all have terminating resistance.
Terminating resistance is used in highspeed
networks to minimize signal
reflections that result from rapidly
changing voltage levels. Many HSCAN
systems utilize two terminating resistors
which are typically located at the ends of
the network. There are many network
construction guidelines manufacturers
follow regarding the overall length of the
wiring, number of modules, and network
message load. It's quite common to
see two 120-ohm terminating resistors
used at the end of each network backbone
but it isn't always the case. General
Motors typically uses passthrough wiring
for its two-wire CANBUS systems.
This allows the technician to troubleshoot
network wiring integrity more
effectively than other systems that use
stub harnesses to link modules to the
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Professional Distributor I October 2023 I VehicleServicePros.com 43
2310PTED_Mantis.indd 1
9/7/23 8:15 AM
lize a single module to serve as the primary termination
point and this is usually done by using a resistance value
of about 60 ohms. Additionally, the other modules will also
be equipped with a higher level of termination between
CANH and CANL, typically 2k-3k ohms. The design of
the network is usually driven by the manufacturer and
their component suppliers. The technicians will need to
familiarize themselves with this information so it can also
be leveraged during diagnostics. Missing termination will
result in high signal reflection and improper communication.
However, some vehicles may use multiple resistors so
beware and never assume that the network design is the same
from one vehicle to another. VAG vehicles use shorter wiring
stubs between their modules which allows them to minimize
signal reflection, allowing the use of a centralized primary
resistor in the ECM. You may have also noticed that HSCAN
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october2023
Table of Contents for the Digital Edition of october2023
Editor's Note – The road to success at trade shows
Sneak Peek
Most Wanted
2023 PTEN People's Choice Award Winners
In Focus
Cover Story – Pinpointing the sale
Diagnostic Tech – Decoding automobile network communication challenges
Show Me Your Truck – Taking a leap of faith
Go Sell Something – Catching the prospect that got away
Driving Sales – Tire & Wheel Service
Tales from the Road – The tool bank
october2023 - 1
october2023 - 2
october2023 - 3
october2023 - Editor's Note – The road to success at trade shows
october2023 - 5
october2023 - Sneak Peek
october2023 - 7
october2023 - 8
october2023 - 9
october2023 - 10
october2023 - 11
october2023 - Most Wanted
october2023 - 13
october2023 - 2023 PTEN People's Choice Award Winners
october2023 - 15
october2023 - 16
october2023 - 17
october2023 - 18
october2023 - 19
october2023 - 20
october2023 - 21
october2023 - 22
october2023 - 23
october2023 - In Focus
october2023 - 25
october2023 - 26
october2023 - 27
october2023 - 28
october2023 - 29
october2023 - 30
october2023 - 31
october2023 - Cover Story – Pinpointing the sale
october2023 - 33
october2023 - 34
october2023 - 35
october2023 - 36
october2023 - 37
october2023 - 38
october2023 - 39
october2023 - Diagnostic Tech – Decoding automobile network communication challenges
october2023 - 41
october2023 - 42
october2023 - 43
october2023 - 44
october2023 - 45
october2023 - 46
october2023 - 47
october2023 - 48
october2023 - 49
october2023 - Show Me Your Truck – Taking a leap of faith
october2023 - 51
october2023 - Go Sell Something – Catching the prospect that got away
october2023 - 53
october2023 - Driving Sales – Tire & Wheel Service
october2023 - 55
october2023 - 56
october2023 - 57
october2023 - Tales from the Road – The tool bank
october2023 - 59
october2023 - 60
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