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WLG2 - Updating Software for Various Control Units (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:

2020

Model Line:

Taycan (Y1A)

Subject:

Software update (software release VR8.7)

Information:

Software optimizations are available for various control units for the Taycan.
An overview of the new features that will be implemented with the software update can be found in
the enclosure under  Technical Information 'Overview of new features implemented by the software
updates'.

Remedial
Action:

Update the software for the following control units using the PIWIS Tester with test software version
39.600.015 (or higher) installed or USB storage medium. For details of affected control units, see
overview below.
Information
During this campaign, the VR8.7 software release will be installed on the affected vehicles. The prerequisite for this is that the previous VR8.6 software release is also installed on the vehicle. In order to ensure
that the software updates are installed in the correct order on all vehicles - regardless of whether or not
the VR8.6 software release is already installed - campaign WLC5 for programming the VR8.6 software
release was closed with the introduction of this campaign WLG2 and the corresponding programming
scopes were transferred to this campaign.

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Depending on whether or not the previous VR8.6 software
release must first be programmed on the relevant vehicle
as a prerequisite for the subsequent programming of the
VR8.7 software release, the vehicles were assigned to the
correct respective campaign scope. Before carrying out
the campaign, the scope of the campaign assigned to the
relevant vehicle must therefore be checked and carried
out accordingly.

Evolution Taycan Software Updates
Overview of control units for software release VR8.6
Control unit

Programming time

Combined software update for various
control units
(Update via PIWIS Tester)

approx. 120 minutes

Includes:
Over-the-air (OTA) control unit
Control unit for high-voltage power
electronics, front and rear
Control unit for high-voltage
charger (OBC)
High-voltage battery control unit
(BMCe)
Control unit for chassis control
(PASM)
Air-conditioning system regulator
control unit, rear
Instrument cluster
Porsche Communication
Management (PCM) control unit
Thermal management (TME)
Roll stabilization (PDCC)
Brake electronics (PSM)
Headlight, left and right

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Action required
program

code

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Rear-end electronics (BCM2)
Porsche Communication Management
(PCM) control unit
(Update via USB storage medium)

approx. 30 minutes

Overview of control units for software release VR8.7
Programming time

Control unit
Combined software update for various
control units
(Update via PIWIS Tester)

Action required
program

code

approx. 100 minutes

Includes:
Control unit for high-voltage
power electronics, front and
rear
Control unit for high-voltage
charger (OBC)
High-voltage battery control unit
(BMCe)
Control unit for chassis control
(PASM)
HV voltage converter
Brake booster (electric brake
booster)
High-voltage DC charger
(booster)
Engine electronics (DME)
Brake electronics (PSM)
Driver’s seat and passenger’s
seat adjustment
Assistance systems (zFAS)
Control unit for air-conditioning
system control
Affected
Vehicles:

Only vehicles assigned to the campaign (see also PCSS Vehicle Information). There are 2,387 vehicles
affected by this campaign.

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Required tools
Information
The Taycan (Y1A) is equipped as standard with a lithium starter battery.
Lithium starter batteries must only be charged using a suitable battery charger that has a current
and voltage-controlled charge map.
For further information about the battery chargers to be used, see  Workshop Manual '270689
Charging battery/vehicle electrical system'.
Tools:

•

•

Battery charger with a current rating of at least 90 A and - if required - also with a current- and
voltage-controlled charge map for lithium starter batteries, e.g. VAS 5908 90 A battery
charger
9900 - PIWIS Tester 3 with test software version 39.600.015 (or higher) installed.

Also required for vehicles with Scope 1 (VR8.6 update):
•

USB storage medium Type A+C 32 GB (for PCM update), Part No. V04014999WW000

Information
The PCM software update is performed using a USB storage medium. The software version that is
specific to each region must be downloaded using the software tool PiUS (Porsche integrated Update
Service) and installed on a blank USB storage medium.
Pay particular attention to the following:
•

For this PCM software update, the USB storage medium USB Type A+C 32 GB with the part number
V04014999WW000 must be used.

•

To use the software tool, one blank or re-writable USB storage medium is required for each individual software update.

•

The software available in PiUS must only be used in accordance with the instructions provided in a
Technical Information published for this purpose.

The software mentioned here must only be used on the vehicles assigned to the campaign. Damage
to the central computer cannot be ruled out if the software is used on other vehicles.
You will find further information on how to install and use the PiUS software tool in the PPN portal under
*PiUS (Porsche integrated Update Service) goes live*.

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Overview of PiUS software versions – PCM update
Part No.

Designation
– Region

Vehicle assignment

9J1919360A

PCM update software
– North America
– Mexico

I-no. ER3/ER4

Preparatory 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 with a current rating of at
least 90 A to the vehicle.
NOTICE

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

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



During control unit programming, always connect the 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.



Position the driver's key with the back facing forward upright between the holding struts in the rear
cupholder (emergency start tray) to guarantee a permanent radio link between the vehicle and remote
control.
NOTICE

Programming interrupted
•

Malfunctions in control unit

•

Risk of damage to control unit



Route the line between the vehicle communication module (VCI) and diagnostic socket on the vehicle
without tension and make sure that the connector is inserted fully into the diagnostic socket.

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Check that the rechargeable battery for the PIWIS Tester is charged sufficiently. Connect the PIWIS Tester
to the power supply unit if necessary.

Information
To carry out the campaign, the PIWIS Tester must be online and logged into the Porsche Partner Network
(PPN).

Information
The procedure described here is based on the PIWIS Tester 3 software version 39.600.015.
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: 1

Connect a suitable battery charger, e.g. Battery charger 90A, to the jump-start terminals in the
luggage compartment and switch it on.

2

Position the driver's key with the back facing
forward upright between the holding struts in the rear
cupholder (emergency start tray) to guarantee a
permanent radio link between the vehicle and remote
control  Emergency start tray.

3

Connect the 9900 - PIWIS Tester 3 to the Vehicle
Communication Module (VCI) via the USB cable.
Then, connect the Communication Module to the
vehicle and switch on the PIWIS Tester.
Due to the long programming time, connect the
PIWIS Testerto the power supply during the
operation.
Information

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Use the new PIWIS Tester data cable for carrying out
the campaign. The difference between the old 
PIWIS Tester data cable -1- and new  PIWIS Tester
data cable -2- data cable is shown in the illustration.
If the connection between the vehicle and PIWIS
Tester is interrupted, check the data cable for the
PIWIS Tester for signs of damage. If the data cable
is damaged, it must be replaced. To do this, follow
the instructions in the PPN for "Returning faulty USB
cable caps" (PPN portal > Dr Ing. h.c. F. Porsche AG
> Aftersales > Workshop > PIWIS > Documents).
4

Establish operational readiness (switch on ignition).

5

On the PIWIS Tester start screen, call up the 'Diagnostics' application.
The vehicle type is then read out, the diagnostic application is started and the control unit selection screen
is populated.

6

PIWIS Tester data cable

Create vehicle analysis log (VAL) using the PIWIS Tester.
Mark the vehicle analysis log you have just created with the attribute "Initial VAL" and after carrying
out the campaign, return it using the PIWIS Tester.

Information
Depending on whether or not the previous VR8.6 software release must first be programmed on the
relevant vehicle as a prerequisite for the subsequent programming of the VR8.7 software release, the
vehicles were assigned to the required campaign scope. Before carrying out the campaign, the scope of
the campaign assigned to the relevant vehicle must therefore be checked and carried out accordingly.
7

Update software for various control units:

Allocation

Software release

Action required

Scope 1:

•
•

VR8.6
VR8.7

To do this, continue with  Technical Information '270689
Updating software for various control units (VR8.6)'.

Scope 2:

•

VR8.7

To do this, continue with  Technical Information '270689
Updating software for various control units (VR8.7)'.

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Updating software for various control units (VR8.6)
WARNING
Electrically moved side windows and rear spoiler
•

Danger of limbs being trapped or severed

•

Risk of damage to components



Rear door windows may drop a few inches during the campaign and remain open. If this is the case, please
manually roll up the windows after the campaign is complete.

