Service

Technical Information

15/21

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WMA5

9

WMA5 - Updating Software for Various Control Units (Workshop Campaign)

Revision:

This bulletin replaces bulletin Group 9 15/21 WMA5, dated May 28, 2021.

Model Year:

2020

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 closely monitored and maintained
between 13.8 volts and 14.8 volts during this programming. Failure to maintain this voltage could result
in damaged control unit(s). It is therefore advised to operate the Deutronics Power Supply (VAS 5908) in
“SUPPLY MODE” with a voltage setting of 14.6 volts and the Air Conditioning System Blower switched
OFF, followed by regular checks of the power supply status, voltage, and vehicle voltage. Certain steps of
this campaign may not be possible until the power supply voltage setting is adjusted then verified by the
PIWIS Tester. 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 Line:

Taycan (Y1A)

Concerns:

Software update (software version VR12.1.1)

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
attachment under  Technical Information 'Overview of new features implemented by the software
updates'.

Action required: •

•

Update the software for the following control units using the PIWIS Tester with software version
40.200.016 (or higher) installed or USB storage medium. For details of affected control units, see
overview below.
Replace Owner's Manual in the on-board folder in the vehicle with an updated version.

Information
During this campaign, the VR12.1.1 software version will be installed on the affected vehicles. The
prerequisite for this is that the previous VR8.7 software version is 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 VR8.7 software version is already installed - campaigns WLG2 and WLG6 for programming
the VR8.7 software version were completed with the introduction of this campaign WMA5 and the
corresponding programming scopes were transferred to this campaign.

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Depending on whether or not the previous VR8.7 software
version must first be programmed on the relevant vehicle
as a prerequisite for the subsequent programming of the
VR12.1.1 software version, 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.

Information
After carrying out this campaign WMA5, carry out
Evolution Taycan Software Versions
campaign WMA7 so that the Porsche Mobile Charger
Connect software is also version VR12.1.1. See  Technical Information 'WMA700 WMA7 Workshop
campaign - Performing software update for charger (Porsche Mobile Charger Connect)'.
Overview of control units for software version VR12.1.1
Programming time

Control unit
Sequence 1: Combined software update
for various control units
(Update via PIWIS Tester)

approx. 125 minutes

Includes:
Distance measuring sensor control unit
(ACC)
Front-end electronics control unit
(BCM1)
Rear-end electronics control unit (BCM
2)
Radar sensor for front corner radar
Lane Change Assist control unit, left
and right
Central control unit for assistance
systems (zFAS)
Airbag control unit
Reversing camera
Interior surveillance sensor
Seat occupancy detection
Weather sensor

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Action required
program

code

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Control unit for garage door opener
Rear lid proximity sensor control unit
Windscreen wiper motor
Sequence 2: Combined software update
for various control units
(Update via PIWIS Tester)

approx. 120 minutes

Includes:
Battery sensor for 12 V vehicle electrical system battery
High-voltage charger (OBC), 11 kW
High-voltage battery control unit (BMCe)
High-voltage DC charger (booster)
HV voltage converter
Control unit for chassis control (PASM)
Power steering (EPS) control unit
Brake electronics (PSM) control unit
Control unit for steering column
adjustment
Control unit for rear axle steering
Rear lid control unit
Air-conditioning control unit
Rear-differential lock control unit
Thermal management control unit
(TME)
Electric passenger compartment
heater (PTC)
Gateway control unit
Head-up display
Instrument cluster
Over-the-air (OTA) control unit
Engine electronics (DME) control unit
Power electronics, front and rear
Transmission electronics control unit
(EGS)

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Roll stabilization control unit (PDCC)
Headlight, left and right
Sequence 3: Combined software update
for various control units
(Update via PIWIS Tester)

approx. 130 minutes

Includes:
Multi-function steering wheel
Control unit for memory seat
adjustment (driver side)
Additional instrument control unit
(stopwatch)
Door control unit, front and rear
Control unit for exterior acoustics
(eSound)
Control unit for interior acoustics
(iSound)
Display and operator control unit in rear
center console
Connect control unit
Brake booster control unit (eBKV)
Night vision system control unit
Control unit for Tyre Pressure Monitoring (TPM)
Control unit for memory seat
adjustment (passenger side)
Control unit for rear spoiler
Sequence 4: Combined software update
for various control units
(update via PIWIS Tester and USB storage
medium)

approx. 60 minutes

Includes:
Porsche Communication Management
(PCM) central computer
Loudspeaker booster
Front display and operator control unit
(central display)

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Passenger display
Operator control unit in the front center
console
Affected
vehicles:

Only vehicles assigned to the campaign (see also PCSS Vehicle Information). This campaign affects
5,235 vehicles.

Parts required
Parts Info:

Owner's Manual
An overview of the required Owner's Manuals is provided under  Technical Information 'WMA700
Overview of order numbers for Driver's Manuals'.

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'.

Information
A blank or re-writable USB storage medium is additionally required for installing the onboard Owner's
Manual.
If no additional USB storage medium is available for carrying out this campaign, a replacement USB
storage medium (e.g. Part No. V04014999WW000) must be purchased. The costs for the USB storage
medium cannot be invoiced under the workshop campaign number.
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 software version 40.200.016 (or higher) installed.
USB storage medium Type A+C 32 GB (for PCM update), Part No. V04014999WW000
USB storage medium, type C (for onboard Owner's Manual update), e.g. Part No.
V04014999WW000

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Information
The central computer (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.

•

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*.
Overview of PiUS software versions – PCM update VR12.1.1
Part No.*

Designation
– Region

Vehicle assignment

9J1919360C

PCM update software
– Europe
– ROW

I-no. ER1/ER2

9J1919360D

PCM update software
– North America
– Mexico

I-no. ER3/ER4

9J1919360E

PCM software update
– Japan
– China
– Korea
– Taiwan

I-no. ER5/ER6/ER7/ER8

Preparatory work
NOTICE
Fault entry in the fault memory and control unit programming aborted due to undervoltage.
•

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.

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NOTICE
Control unit programming will be aborted if the WiFi 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

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.



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).

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Information

Use the new PIWIS Tester data cable to carry out the
campaign. The difference between the old  PIWIS Tester
data cable -1- and new  PIWIS Tester data cable -2data 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. Porsche AG > Aftersales > Workshop > PIWIS >
Documents).

Information
The procedure described here is based on the PIWIS
Tester 3 software version 40.200.016.
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.

PIWIS Tester data cable

Information
The state of charge of the high-voltage battery should not be less than 30% or more than 80% for the
software update.
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.
Information
To prevent any excessive and potentially noticeable heating of the charging clamp of the negative
cable while charging the 12-volt vehicle electrical system battery using an external battery charger,
always check the following points:

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•

Always connect the charging clamp of the negative cable vertically from above to the ground
point for the external power connection. Make sure that the charging clamp cable is routed
loosely to prevent the charging clamp from tilting sideways at the ground point.

•

When connecting the charging clamp, make sure that it is a sufficient distance away from
peripheral parts (e.g. pneumatic supply line for air-spring strut).

•

Before raising the vehicle using a lifting platform, always disconnect the battery charger
completely from the vehicle to prevent the connecting line of the charging clamp from
becoming taut and prevent the charging clamp from tilting sideways at the ground point.

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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.

Emergency start tray
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 ensure a permanent radio link between the vehicle and remote
control.
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, operate the
PIWIS Testervia the power supply.

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