harness are checked similarly (Fig.
34 and 35)

Fig. 34

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Fig. 35

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• To remove the HV connector at the
-VX81- A/C Compressor, first
remove the harness retainer clip
(circled) from the bracket (Fig. 36).

Fig. 36
• In vehicles equipped with fourwheel drive, a long right angle pick
tool with a solid handle is useful for
accessing the HV connector
(circled) of the -A19 - Voltage
Converter (Fig. 37).
• When removing the HV connector,
care must be taken to avoid making
contact between the B+ post of the A19 - Voltage Converter and
chassis ground. The B+ post is
connected to the 12V battery
positive terminal through the main
fuse block SA.
Fig. 37

Page 29 of 45
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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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• After completing the entire set of
measurements for all components
in the HV system, perform a repeat
measurement of any individual
component that was suspicious or
questionable.
• For components on the HV auxiliary
harness, a direct measurement at
the component is achieved using
the appropriate HV measurement
adapter VAS 6558A/36A or VAS
6558A/37 as needed to match the
connector type on the component
being measured.
• In the example shown (Fig. 38) the
VAS 6558A/37 is being used to
perform the measurement directly at
the -Z132- Heating Element (PTC) 3
– Water Heater (Battery Coolant
Heating).

Fig. 38

Reference information – Capacitance measurements
• The VAS 6558A cannot measure
capacitance, therefore a separate
multimeter must be used.
• The VAG 1526B multimeter is not
distributed within North America.
Instead, the Fluke 83-V or
equivalent with a suitable
capacitance measurement range
and resolution may be used (i.e.,
maximum capacitance 9,999 µF,
accuracy ±(1% + 2), maximum
resolution 0.01 nF).
• Before taking a capacitance
measurement, it is necessary to
discharge any energy stored in the
capacitor being measured (Fig. 39).
• To discharge the capacitor, perform
a continuous voltage measurement
until 0.1V or less is displayed.
Fig. 39

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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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• The acceptable unit of data entry for
all capacitance measurements is µF
and any measurements given in nF
must be converted accordingly (Fig.
40)
• 1,000 nF = 1 µF
• 1 nF = 0.001 µF

Fig. 40
• Pay attention to whether the
capacitance measurement on the
multimeter display is given as µF or
nF, which will vary according to
auto-ranging behavior (Fig. 41)
• For the example given:
a. Display: 990 nF – Input: 0.990
µF (conversion from nF to µF)
b. Display: 625 µF – Input: 625 µF
(conversion not required)
•

Fig. 41
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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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Reference information – Diode test mode measurements
• The diode test mode of the VAS
6558A is used to test the individual
components (Fig. 42).
• The response of the forward voltage
drop varies, according to circuits
contained in the components.

Fig. 42

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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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• Before doing the diode test, a
voltage measurement is taken until
any voltage present in the
capacitors of the component is
dissipated (Fig. 43).

Fig. 43

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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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• The measurement using the diode
test mode will be conducted when
the button is pressed, after the
voltage measurement is completed
(Fig. 44).

Fig. 44

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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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• For the example given at -JX1power electronics in the reverse
direction, the voltage 4.43 V
indicates the result is OK and open
circuit in the blocking direction (Fig.
45).

Fig. 45

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• For the example given at -JX1power electronics in the forward
direction, the voltage drop 0.46V is
acceptable for the particular
component under test (Fig. 46).
• The response of the forward voltage
drop varies, according to circuits
contained in the components.

Fig. 46

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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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93-24-01 - Service Information, HV Component Measurement
Process

Typical Values of Plausible Measurements:
The values given in the table below are for reference only and are not specifications. These values are
not to be used for “good vs. bad” determinations and are representative of typical values in vehicles
without faults across a range of years and hardware versions.
If an individual measurement is suspicious, then it should be repeated. If the same measurement type is
abnormal across several components, then the equipment should be checked, and the GFF test plan
reviewed carefully, to be certain that the HV adapters and probes are being used correctly.

Voltage at TNS

+ to -

0

V

Voltage at AUX

+ to -

0

V

Resistance between
TNS and AUX

+ to +

0.01 –
0.10

Ω

Resistance between
TNS and AUX

- to -

0.01 –
0.10

Ω

ISO@250V

+ to -

>500

MΩ

ISO@500V

+ to
Chassis

>500

MΩ

ISO@500V

- to
Chassis

>500

MΩ

+ to
Chassis

9

nF

Y-Capacitance

0.009

µF

- to
Chassis

10

nF

0.010

µF

Voltage

+ to -

0

V

ISO@250V

+ to -

11.5

MΩ

ISO@500V

+ to
Chassis

>500

MΩ

ISO@500V

- to
Chassis

>500

MΩ

AX2 - High-Voltage Battery 1
TNS and AUX connections

Y-Capacitance

AX2 - High-Voltage Battery 1
DC charging connection

Page 37 of 45
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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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4

nF

0.004

µF

- to
Chassis

6

nF

0.006

µF

Voltage