whenever prompted to do so during
the GFF test plan (Fig. 14).
• The pointed tips from the VAS
6558A kit are not used with the HV
measurement adapters, but are
needed for performing the
calibration. Install the pointed tips
when prompted to “merge” the red
and black probes.
• Take care to press the button on the
red probe only as instructed.

Fig. 14

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• For the first run-through, the “overall
system” check should be performed
(Fig. 15).
• The “individual HV component”
check is used to repeat the
measurements for validation
purposes on a single component
that is suspicious or questionable
after running through the complete
measurements of all components.
• At individual components on the
auxiliary circuit, the measurements
may be repeated directly at the
component using the appropriate
HV measurement adapter VAS
6558A/36A or VAS 6558A/37 as
needed, depending on the
connector type.

Fig. 15
• Take care to observe small changes
in the text.
• In the example shown, the first test
will be a series of measurements at
the DC charging connection of the
HV battery (e.g., with VAS
6558A/35 adapter plugged into the
HV battery DC connection (Fig. 16).

Fig. 16

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• Later the measurement is done at
the DC charging connection to the
HV battery (e.g., with VAS
6558A/35 disconnected from the HV
battery and connected only to the
HV connector leading up to the
charging socket (Fig. 17).

Fig. 17
• Designation of battery HV
connections used in the GFF test
plan:
a. TNS connection of the AX2 High-Voltage Battery 1
b. AUX connection of the AX2 High-Voltage Battery 1.
c. DC charging socket of the AX2 High-Voltage Battery 1.

Fig. 18

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Reference information – Connection of HV measurement adapters to vehicle
• Example of HV adapter connections
at HV battery (Fig. 19):
a. VAS 6558A/35 connected to
TNS (traction connector) of the
HV battery.
b. VAS 6558A/36A connected to
AUX (auxiliary connector) of the
HV battery.
• Example of black lead of VAS
6558A clipped to chassis ground
point at HV battery (Fig. 20).
• Note that measurements of all
auxiliary components are generally
taken through the auxiliary harness.
After a measurement is taken with
all of the components on the
auxiliary harness still connected, all
of the components are
disconnected, and then
reconnected one at a time.

Fig. 19

Fig. 20

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• Example diagrams of HV adapter
connections and designations of
connectors at HV battery as
provided through functional
description attachments within the
GFF test plan.
• At auxiliary AUX and traction
network TNS connectors (Fig. 21)
• At DC charging connector (Fig. 22)

Fig. 21

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Fig. 22

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• Example of VAS 6558A/35 adapter
connected with the DC charging
socket to the -AX2- High-Voltage
Battery 1 (Fig. 23) and associated
diagram (Fig. 24).
• Note that the HV adapters are
never connected inline between two
components in this measurement
procedure!

Fig. 23

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Fig. 24

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• Example of VAS 6558A/35 adapter
connected with the -JX1- Electric
Drive Power and Control Electronics
(Fig. 25).
• Note that the measurements of the
rear electric drive -JX1- are taken
through the HV harness, because it
is not possible to disconnect the HV
connector from the -JX1- however,
in vehicles equipped with all wheel
drive, it is necessary to then remove
the HV connector from the JX4 Electric Drive Power and Control
Electronics 2 before taking
measurements of the -JX1- (Fig.
26).
• Under no circumstances should the
HV measurements be taken with
front (-JX4-) and rear (-JX1-)
connected to the HV harness at the
same time. Such measurements
would be inconclusive and must be
repeated.

Fig. 25

• Measurements at the -JX4- are
similar to the -JX1-, with the
exception that the VAS 6558A/35
adapter is connected directly into
the HV connector of the -JX4- rather
than through the HV harness.

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time without notice. No part of this document may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical,
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Fig. 26

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Fig. 27

Fig. 28

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• When taking the insulation
resistance measurements at certain
HV components with 250 Volts
between HV+ and HV- the normal
value may be low enough to cause
what appears to be an incorrect
result.
• The insulation resistance test is
being used in this way to check the
HV component against a good
reference value and is not being
used to measure insulation
resistance against the vehicle
chassis.
• In the example shown (Fig. 29) the
value 7818.01 Ohm is within the
normal range for the -JX1- power
electronics.
• If the measurement is repeated the
value may increase, but repeat
measurements are not necessary in
this case (Fig. 30 and 31).

Fig. 29

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Fig. 30

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Fig. 31

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• Example showing connection of the
HV adapter VAS 6558A/36A to the
HV auxiliary harness (Fig. 32 and
33).
• The measurement of all
components on the HV auxiliary
harness is taken through the
harness first with all components
connected, then with the harness
only (all components disconnected),
and lastly with each component
individually (reconnected one at a
time).

Fig. 32

Fig. 33
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• Example diagrams, showing how
single HV components are normally
measured one at a time, through
the auxiliary harness. Diagrams are
shown for two components only, all
other components on the auxiliary