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WNC3 - Re-Programming 7.2 kW High-Voltage Charger (OBC) (Workshop Campaign)

Important:

CRITICAL WARNING -This campaign includes steps where control unit(s) in the vehicle will be
programmed with the PIWIS Tester. The vehicle voltage must be maintained between 13.5 volts and 14.5
volts during this programming. Failure to maintain this voltage could result in damaged control unit(s).
Damage caused by inadequate voltage during programming is not a warrantable defect. The technician
must verify the actual vehicle voltage in the PIWIS Tester before starting the campaign and also document
the actual voltage on the repair order.

Model Year:

As of 2017 up to 2019

Vehicle Type:

Panamera 4 E-Hybrid (971)
Panamera Turbo S E-Hybrid (971)
Panamera 4 S E-Hybrid Executive (971)
Panamera Turbo S E-Hybrid Executive (971)
Panamera Turbo 4 E-Hybrid Sport Turismo (971)

Equipment:

Charger, 7.2 kW (M No. KB2)

Concerns:

High-voltage charger (OBC) 7.2 kW

Information:

Due to a software error in the 7.2 kW (OBC) high-voltage charger, there is a possibility that an
unauthorized warning message "Engine cannot be started" in the instrument cluster on the
affected vehicles. Remove vehicle plug" is displayed.

Action required: Re-program the 7.2 kW (OBC) high-voltage charger with updated software.

Information
During the campaign, the high-voltage charger control unit is re-programmed and then re-coded automatically.
It takes about 10 minutes to program and code the control unit.
Affected
vehicles:

Only vehicles assigned to the campaign (see also PCSS Vehicle Information).

Required tools
Tool:

•
•

9900 - PIWIS Tester 3 with PIWIS Tester software version 40.850.045 (or higher) installed
Battery charger with a current rating of at least 90 A, e.g. VAS 5908 battery charger 90A

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Preliminary work
NOTICE
Fault entry in the fault memory and control unit programming aborted due to low-voltage.
•

Increased current draw during diagnosis or control unit programming can cause a drop in voltage, which
can result in one or more fault entries and the abnormal termination of the programming process.



Before starting control unit programming, connect a suitable battery charger or power supply, suitable for
AGM type batteries, recommended current rating of 90A fixed voltage 13.5V to 14.5V.
NOTICE

Control unit programming will be aborted if the Internet connection is unstable.
•

An unstable Internet connection can interrupt communication between PIWIS Tester and the vehicle
communication module (VCI). As a result, control unit programming may be aborted.



During control unit programming, always connect PIWIS Tester to the vehicle communication module (VCI)
via the USB cable.
NOTICE

Control unit programming will be aborted if the driver's key is not recognized
•

If the driver's key is not recognized in the vehicle, programming cannot be started or will be interrupted.



Place the driver's key with the back facing down into the front left storage compartment in the center
console to guarantee a continuous radio link between the vehicle and the driver's key.

Work
Procedure:

Carry out general preliminary work for control unit programming as described in  Workshop Manual
'Basic instructions and procedure for control unit programming using the PIWIS Tester'.

Re-programming the 7.2kW (OBC) high-voltage charger
Information
The procedure described here is based on the PIWIS Tester 3 software version 37.100.010.
The PIWIS Tester instructions take precedence and in the event of a discrepancy, these are the
instructions that must be followed.
A discrepancy may arise with later software versions for example.
Work
Procedure:

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Re-program the high-voltage charger control unit.
The basic procedure for control unit programming is described in the Workshop Manual  Workshop
Manual '9X00IN Basic Instructions and Procedure for Control Unit Programming Using the PIWIS Tester'

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For specific information on control unit programming during this campaign, see the table
below:
Required PIWIS Tester software version:

40.850.045 (or higher)

Type of control unit programming:

Control unit programming using the 'Campaign'
function in the Additional menu on the PIWIS Tester
by entering a programming code.

Programming code:

H9K2C

Programming sequence:

Read and follow the information and instructions
on the PIWIS Tester during the guided programming
sequence.
During the programming sequence, the high-voltage
battery control unit is re-programmed and then
re-codedautomatically.
Do not interrupt programming and coding.

Programming time (approx):

10 minutes

Software version programmed during this
campaign:

4703

Procedure in the event of abnormal termination of control unit programming:

•
•

Procedure in the event of error messages
appearing during the programming
sequence:

 Workshop Manual '9X00IN Basic instructions and

Following control unit programming, the software
version can be read out of the high-voltage charger
control unit in the 'Extended identifications' menu using
the PIWIS Tester.
Switch ignition off and then on again.
Repeat control unit programming by entering the
programming code again.

procedure for control unit programming using the
PIWIS Tester - section on "Fault finding"'.

Concluding work
Information
Brief breaks in communication between the control units during programming and coding can result in
fault memory entries in all control units in the vehicle system, which might not be deleted automatically.
In addition to the automatic deletion of the fault memories during programming, the fault memories
of all control units must therefore be read out and deleted again as described below after each
programming and coding process.

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Retrieve and erase the fault memories of all control units.
1.1

Press •F7“ in the control unit selection screen ('Overview' menu) to call up the Additional
menu.

1.2

Select the function "Read all fault memories
and erase if required" and press •F12“
('Next') to confirm  Erase fault memory.
The fault memories of the control units are
retrieved.

1.3

Once you have retrieved the fault memories,
check the fault memory entries.
Information
Erase fault memory
If control units are found to have faults that
are not caused by control unit programming,
these must first be found and corrected. This work cannot be invoiced under the
workshop campaign number.

1.4

Press •F8“ to delete fault memory entries.

1.5

Press •F12“ ('Yes') to confirm whether you really want to delete all fault memory entries.
The faults stored in the fault memories of the various control units are deleted.
Information
If fault memory entries for individual control units cannot be deleted, proceed as follows:

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•

Switch off the ignition.

•

Disconnect the PIWIS Tester diagnostic connector from the diagnostic socket.

•

Lock the vehicle using the driver's key.

•

Wait approx. 1 minute before unlocking the vehicle again.

•

Start the engine, leave it running for a short time and then stop it again.

•

Switch off the ignition and wait approx. 10 seconds before switching it back on again.

•

Plug the PIWIS Tester diagnostic connector into the diagnostic socket again and restore
communication with the vehicle.

•

Read out the fault memory again and delete any fault memory entries that are stored.

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Once you have erased the fault memories,
select the 'Overview' menu to return to the
control unit selection screen.  Control unit
selection

2

Switch off ignition.

3

Disconnect the PIWIS Tester from the vehicle.

4

Switch off and disconnect the battery charger.

5

Enter the campaign in the Guarantee and Maintenance booklet.

Control unit selection

Warranty processing
Information
The specified working time was determined specifically for carrying out this campaign and includes all
necessary preliminary and subsequent work.
The working time may differ from the working times published in the Labor Operation List in PIWIS.
Scope 1:

Re-programming the 7.2kW (OBC) high-voltage charger
Labor time:
Re-programming the 7.2kW (OBC) high-voltage charger
Includes:
Connecting and disconnecting battery charger
Connecting and disconnecting PIWIS Tester
Retrieving and erasing fault memories

Labor time: 42 TU

 Damage code WNC3 066 000 1

Important Notice: Technical Bulletins issued by Porsche Cars North America, Inc. are intended only for use by professional automotive technicians who have attended Porsche service training
courses. They are written to inform those technicians of conditions that may occur on some Porsche vehicles, or to provide information that could assist in the proper servicing of a vehicle. Porsche special
tools may be necessary in order to perform certain operations identified in these bulletins. Use of tools and procedures other than those Porsche recommends in these bulletins may be detrimental to the
safe operation of your vehicle, and may endanger the people working on it. Properly trained Porsche technicians have the equipment, tools, safety instructions, and know-how to do the job properly and
safely. Part numbers listed in these bulletins are for reference only. The work procedures updated electronically in the Porsche PIWIS diagnostic and testing device take precedence and, in the event of a
discrepancy, the work procedures in the PIWIS Tester are the ones that must be followed.

© 2022 Porsche Cars North America, Inc.

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