Service

Technical Information

2026

ENU

WTE1

5

WTE1 - Re-Programming Rear-End Electronics Control Unit (J393) (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 in 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:

2026

Change
Overview:

Revision

Date

Change

0

04/09/2026

•

First Publication

1

04/14/2026

•

Update to Re-programming
control unit for rear-end
electronics, Information
updated.

Model Line:

Macan Electric (XAB)

Concerns:

Rear-end electronics control unit (J393)

Information:

There is a possibility that faulty position values of the luggage compartment lid may be stored in the
rear-end electronics control unit (J393) on the affected vehicles.
As a result, the end position of the luggage compartment lid that is stored in the rear-end electronics control
unit deviates from the actual mechanical position. This may result in restricted comfort function, for example
due to incomplete opening of the luggage compartment lid, reduced effect of the closing aid or premature
stopping of the movement sequence if the obstruction detection triggers without authorization.

Action:

•
•

Checklist:

Re-programming control unit for rear-end electronics (J393). In addition, other control units are automatically updated to a corresponding software version
Minimum requirement: Release 44.000.031 (or higher)

Due to the high number of programming steps incorrectly carried out as part of the last software update, a
checklist was created to improve the overview of the work to be carried out. This can be used as a tool at the
start and for support during the update.
The checklist must be completed, signed and attached to the PQIS quality line in the PCSS.
For the checklist, see ⇒ Technical Information 'Checklist'

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Supporting
Videos:

For a better overview of the work to be carried out, several supporting videos have been created for individual
work steps.
The supporting videos are available in PCSS: ⇒ Workshop Manual '9X00IN10 Electrical system – general
information (implementation of a software network update)'

Affected
Vehicles:

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

Required tools
Tools:

•
•

Porsche Tester P90999 - Porsche Tester 4
Battery charger with a current rating of at least 90 A, e. g. VAS 5908 - 90 A battery charger. For
further information about the battery chargers to be used, see the corresponding Workshop Manual. ⇒
Workshop Manual '270689 Charging vehicle electrical system battery'

Re-programming control unit for rear-end electronics (J393)
NOTICE
Sitting inside the vehicle during the update
•

Update cancelled by automatic ignition activation

Þ
⇒

Avoid sitting inside the vehicle during the update.
NOTICE

The specified update process was not followed
•

Update cancellation

•

Destruction of control units

Þ
⇒

Observe and follow the procedures displayed for the update and instructions for the Porsche Tester

Þ
⇒

Do not switch the ignition on/off without instruction from Porsche Tester

Þ
⇒

Repeat the programming only if a failed update is displayed on the Porsche Tester

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Information
Vehicle update – general information
The entire vehicle network will be checked for a necessary update or computed to ensure fault-free functioning of the vehicle. For this purpose, the following preparations are to be made:
•

Latest release on available on Porsche Tester 4 and PiUS

•

Vehicle is fully built up

•

To prevent potential faults due to insufficient data transfer, carry out the software update using
a cable (between VCI and Porsche Tester). Only if sufficient WLAN availability is ensured in the
workshop can a wireless update be performed

•

The user must be logged into the Porsche Tester 4 in the PPN

•

The vehicle must be supported with an external charger

•

Seat heating and seat ventilation are not active

•

Place the original hand-held transmitter in the emergency start tray (see Workshop Manual)

For this update procedure, the respective vehicle no longer needs to be in transport mode
Procedure for new vehicles with active transport protection:
Perform “Vehicle handover” routine according to the Porsche Tester instructions, to deactivate transport
protection.
Always make sure: to answer the question of “Is this a new vehicle?” asked by the Tester with No!
As a result, no complete vehicle commissioning is carried out and only transport protection can be deactivated.
A NOTE ON CAMPAIGN PROGRAMMING FOR MULTIPLE VEHICLES AT THE SAME TIME: PCNA will make an
exception to warranty policy regarding the necessary time keeping procedures when performing campaigns
with an Integration test. Though warranty policy guidelines state that no technician may be punched on
more than one R.O. at the same time, an exception will be made for these campaigns. Due to the extensive
programming time necessary, a technician may perform multiple integration test campaigns at one time, as
long as there is a separate identifiable punch for each on the respective repair order and the total number of
campaigns being performed at one time does not exceed 3 vehicles. The exception will be made so that full
"active participation time" does not need to be documented for these 3 campaigns only. Please refer to the
Campaign FAQ document on PPN for more information.
Work Procedure: 1

Observe preconditions for control unit programming.

⇒ Technical Information '9X10IN Basic instructions and procedure for control unit programming using
the PIWIS Tester Information'

Information
An active internet connection with the Porsche Tester must be ensured.
The technician must log in to PPN with the Porsche Tester.
The Porsche Tester must not be charged using the cigarette lighter.

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Information
Before starting the diagnosis, it is essential for an ignition change to be performed on the vehicle.
Subsequently, after starting the diagnosis, the VCI will be automatically initialized and the control unit
data is loaded.
For additional information on the programming procedure and when the process is aborted, see ⇒
Technical Information '9X10IN Additional information on control unit programming and coding'.
2

Re-programming the rear-end electronics control unit (J393) and updating the software of various
control units.
2.1

Start new logging via •P2“ button on PT4G, then select Logging.

2.2

Press •F3“ to start the integration test in the control unit overview.

2.3

Start the software update with ‘Campaign’ •F5“ and program as per the menu.

After the update has been completed, a corresponding confirmation is displayed on the Porsche Tester. All
affected control units should now be successfully programmed or checked in the results view showing the
control units and their status.
Information
If a deviation in the integration test is still indicated despite the programming carried out, this must be
repeated. If the deviation persists, contact Technical Support.

Information
The entire update process for this action takes approx. 45 minutes depending on the equipment.
However, the download speed of the update package depends on the performance of the local network and
can vary accordingly.

Information
During the update process, all displays in the vehicle (instrument cluster, central display and passenger
display) can be occasionally switched off. Nevertheless, the programming is ongoing; the ignition must not
be switched on/off, as this can result in the destruction of the control units.

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If Wi-Fi coverage is insufficient, the connection between the
Porsche Tester and VCI can be interrupted (battery charge
indicator at the top right inactive on the Tester display).
The vehicle will, nevertheless, continue programming independently. In the meantime, no entry may be made on the
Porsche Tester, and the programming must not be restarted.
In this case, the update progress can still be checked in
the vehicle in the front display and control panel (R238) by
going to the “Messages” (RPC+) tile.
For specific information on control unit programming
during this campaign, see the table below.

Update progress on central display

Required Porsche Tester software release:

44.000.031 (or higher)

Type of control unit programming:

Start control unit programming in the integration test
using the ‘Campaign’ function with •F5“

Campaign to be carried out: WTE1
Programming sequence:

Read and follow the information and instructions on
the Porsche Tester during the guided programming
sequence.
Do not interrupt the programming and coding
process.
A backup documentation process for the
re-programmed software releases starts as soon as
programming and coding is complete.

Programming time (up to):

45 minutes (depending on equipment)

Control units programmed as part of this
campaign:

•
•

AfterSales

Rear-end electronics control unit (J393)
other control units whose software version is
lower than the target software version of the
baseline

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Procedure if error messages appear during the
programming sequence:

⇒ Technical Information '9X10IN Basic instructions

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

Continue the campaign sequence to the end and,
once it is completed, perform the integration test
again and restart the programming.

and procedure for control unit programming using
the PIWIS Tester Information'

Specific information on the procedure in the event
of cancellation: ⇒ Technical Information '9X10IN
Additional information on control unit programming
and coding'
3

After the software update is complete, perform a vehicle bus idle.
Information
A bus idle is always required upon completion of a software update.
The duration of the required bus idle, however, depends on the number and type of control units
previously updated.
Therefore, please always note the information on the duration of the required bus idle in this Technical
Information.

4

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3.1

Return to the control unit overview by pressing •F11“.

3.2

End vehicle’s readiness for operation (ignition off). Central computer (PCM) screen switches off.

3.3

Wait for 5 minutes with the driver’s door open.

Review the vehicle’s readiness for driving.
4.1

Establish readiness for operation (ignition on).

4.2

Operate the footbrake and keep it pressed.

4.3

Use the selector lever to successively engage driving gears D and R. The selected gear must be
displayed in the gear indicator on the instrument cluster.

4.4

Activate the parking lock via button P.

5

End readiness for operation (ignition off) and restore it after waiting approx. 30 seconds (ignition on).

6

Teaching the rear lid:
6.1

Select control unit for rear-end electronics (J393).

6.2

Open “Maintenance repairs” menu.

6.3

Select the menu item “Teach tailgate” and execute it, following the Tester instructions.

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Read out and delete the fault memory.
Information
Due to the vehicle diagnosis and programming status (new vehicles), fault memory entries that do not
indicate an actual fault in the vehicle may be stored.
These fault memory entries, for the most part, can be deleted after vehicle handover has been
completed and a test drive.
The following fault memory entry is always stored as part of a vehicle diagnosis with the Porsche Tester
and does not represent an actual fault.
Control unit

Fault code

Description

various control units

B184C00

Protection of vehicle diagnostics, activation
active

Main control unit for gateway
HCP5 (J1273)

U17A000

Diagnostic filter, access protection deactivated

Drive and chassis main
control unit HCP1 (J1312)

C140DF0

Vehicle Protected Environment (VPE), vehicle
protection activated

For other valid fault codes, see ⇒ Technical Information '9X10IN Valid fault codes after software update'
7.1

Press •F7“ to call up the additional menu on the Porsche Tester.

7.2