October 2023 - 36
In the event that a module drops offline, their
counterparts are at the ready to raise awareness
of their visibility or lack thereof. When
you're presented with such a problem you will
need to know a few things about that module
which are as follows:
* Module location (inside or outside of
the vehicle)
* Power and ground supply points
* Any connections between the module
and the rest of the vehicle
* How the module is activated for action
Armed with that information you would
now want to find the most efficient way to
analyze the situation. If this device has a
single power source protected by a fuse that
isn't responsible for supplying power to any
other components on the vehicle, then you
have the upper hand. From this single fuse,
you may be able to learn more about this
module quickly. If I'm presented with such
a scenario, I'll not only check for voltage
on either side of the fuse, but I'll install a
fused current loop in place of the fuse so
I can measure current flow since this will
give me a sense of whether the module is
able to power up and attempt to work or is
the device down for the count. If I find the
protected supply voltage is sufficient at the
fuse and has zero energy being consumed, I
am now interested in validating the ground
side of the module. And from there I'll be
looking into how the module is activated for
service, and now I'm prepared to properly
analyze the module.
At the module armed with an accurate
connector pin-out diagram, I'm ready to test.
In the scenario where you have multiple
modules reporting communication faults
with other modules, then a close look at an
accurate wiring diagram is step one. When
analyzing the diagram take note of where
each module is located (inside or outside) on
the vehicle, how it is wired into the network,
and how termination is provided. Some wiring
diagrams do an excellent job of calling
out terminating resistors and their values
while others require more research to surface this information.
Understanding how the system is wired is crucial since you may
find a module serving as a Pass-Thru device (Figure 5) potentially
offering up a convenient testing location.
In the condition where the faults are intermittent (non-hard
36 PTEN OCTOBER 2023 www.VehicleServicePros.com
p Figure 5 - Body controller Pass-Thru network
Photo from Tesla
p Figure 6 - VW network wiring diagram
Photo from ALLDATA
fault) you may need to deconstruct the series of DTCs initially
encountered and compare those to new faults that may have been
set after a code clear. Using this information can aid the technician
with enough evidence to hold against a module you suspect
as being the source of the intermittent failures.
http://www.VehicleServicePros.com
October 2023
Table of Contents for the Digital Edition of October 2023
EDITOR'S NOTE
NEW PRODUCTS
PEOPLE’S CHOICE AWARD
BEST YOUNG TECH AWARD
DIAGNOSTIC TECH
TOOL BRIEFING
INNOVATION AWARD PROFILE
TOOL REVIEWS
CATEGORY SPOTLIGHT
BIG-TIME BOXES
October 2023 - 1
October 2023 - 2
October 2023 - 3
October 2023 - 4
October 2023 - 5
October 2023 - 6
October 2023 - 7
October 2023 - EDITOR'S NOTE
October 2023 - 9
October 2023 - NEW PRODUCTS
October 2023 - RSC1
October 2023 - RSC2
October 2023 - 11
October 2023 - 12
October 2023 - 13
October 2023 - 14
October 2023 - 15
October 2023 - 16
October 2023 - 17
October 2023 - PEOPLE’S CHOICE AWARD
October 2023 - 19
October 2023 - 20
October 2023 - 21
October 2023 - 22
October 2023 - 23
October 2023 - 24
October 2023 - 25
October 2023 - 26
October 2023 - 27
October 2023 - BEST YOUNG TECH AWARD
October 2023 - 29
October 2023 - 30
October 2023 - 31
October 2023 - DIAGNOSTIC TECH
October 2023 - 33
October 2023 - 34
October 2023 - 35
October 2023 - 36
October 2023 - 37
October 2023 - 38
October 2023 - 39
October 2023 - 40
October 2023 - 41
October 2023 - 42
October 2023 - 43
October 2023 - TOOL BRIEFING
October 2023 - 45
October 2023 - 46
October 2023 - 47
October 2023 - INNOVATION AWARD PROFILE
October 2023 - 49
October 2023 - TOOL REVIEWS
October 2023 - 51
October 2023 - 52
October 2023 - 53
October 2023 - CATEGORY SPOTLIGHT
October 2023 - 55
October 2023 - 56
October 2023 - 57
October 2023 - BIG-TIME BOXES
October 2023 - 59
October 2023 - 60
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