No. 16-21 Service Bulletin/Repair Instructions

Service
Technical Information
16/21
ENU
WMA6
9
WMA6 - 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:
2021
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 enclosure 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 test software version

40.000.018 (or higher) installed or USB storage medium. For details of affected control units, see

overview below.

Overview of control units for software version VR12.1.1

Control unit
Programming

time
Sequence 1: Combined software update for various

control units (update via PIWIS Tester)
approx. 100

minutes
Action required

program
code
Includes:

• Distance measuring sensor control unit (ACC)

• Front-end electronics (BCM1) control unit

• Rear-end electronics (BCM 2) control unit

• Radar sensor for front corner radar, left and

right

• Lane Change Assist, left and right

• Central assistance systems (zFAS)
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• Airbag control unit

• Reversing camera

Sequence 2: Combined software update for various

control units (update via PIWIS Tester)
approx. 70

minutes
Includes:

• High-voltage charger (OBC) 11 kW/22 kW

• High-voltage battery control unit (BMCe)

• High-voltage DC charger (booster)

• HV voltage converter

• Control unit for chassis control (PASM)

• Power steering control unit (EPS)

• 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

• OTA software partition

• Engine electronics (DME) control unit

• Power electronics, front and rear

• Roll stabilization control unit (PDCC)

• Headlights, left and right

Sequence 3: Combined software update for various

control units (update via PIWIS Tester)

Includes:

• Multifunction steering wheel

• Seat adjustment control unit, front
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approx. 30

minutes
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Technical Information
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• Additional instrument control unit (stopwatch)

• Door control unit, front and rear

• Control unit for exterior acoustics (eSound)

• Control unit for interior acoustics (eSound)

• 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 Tire Pressure Monitoring (TPM)

• Control unit for rear spoiler

• Inductive charger for mobile devices

Sequence 4: Combined software update for various

control units (update via PIWIS Tester and USB

storage medium)
approx. 50

minutes
Includes:

• Central computer (PCM)

• Loudspeaker booster

• Front display and operator control unit

Affected

Vehicles:
Only vehicles assigned to the campaign (see also PCSS Vehicle Information). There are 2,025 vehicles

affected by this campaign.
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 40.000.018 (or higher) installed.

USB storage medium Type A+C 32 GB (for PCM update), 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
9J1919360D
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 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.

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.
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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.

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 40.000.018.

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
PIWIS Tester data cable
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, operate the

PIWIS Testervia the power supply.
Emergency start tray
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.
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Technical Information

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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.
Updating software for various control units (VR12.1.1)

WARNING

Electrically moved side windows and rear spoiler

•
Danger of limbs being trapped or severed
•
Risk of damage to components

Do not reach into the danger area.

Keep third parties away from the danger area.

Do not move components or tools into the danger area.
Information

The programming sequences used during this campaign include all control units from software release

VR12.1.1. In the programming sequence, the software versions of the individual control units are initially

compared with the required status of software release VR12.1.1. If the actual status already matches,

the programming of the relevant control unit is automatically skipped, and so the scope of the control

units programmed may vary depending on the vehicle.

The individual programming sequences 1 through 4 can be carried out on different days.

Work Procedure: 1
Select the guest account from the central display (PCM) and activate Privacy mode (available in

some countries).

Information

To ensure that no user-specific settings from Cloud-based services (Porsche Connect & My

Porsche) are lost during the update, activate Privacy mode before carrying out the update. When

Privacy mode is activated, communication between the vehicle and the Porsche Connect app and

My Porsche is disabled. No vehicle-specific information is transferred. As a result, settings cannot

be configured on the vehicle using the Porsche Connect app or My Porsche.

When the instrument cluster and central computer are re-programmed, the individual settings

implemented in the vehicle by the customer will be lost and reset to the default values of the

country version that applies to the vehicle.

After carrying out the campaign, please inform customers that personal settings they have

implemented in the instrument cluster and central display of the central computer will have to be set

again and provide them with any help and support they need for setting the relevant options.
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This affects the following settings, for example:
2
•
Individual settings for tubes 1 to 3 of the instrument cluster as well as the extended map view or

reduced view of the instrument cluster
•
Selected functions of individual tubes in the instrument cluster, e.g. auto zoom, 3D map and

satellite map
•
Arrangement of tiles in the home screen and MyScreen on the central display
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'.

12 3

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