No. 123-20 Service Bulletin/Repair Instructions

Service
Technical Information
123/20 ENU
WLG6
2
WLG6 - Re-Programming High-Voltage Charger (OBC) Control Unit (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:
Control unit for high-voltage charger (OBC)
Information:
Optimized software is available for the high-voltage charger for the Taycan.

This software update improves at-home charging (AC charging process) and further optimizes the calculation of battery capacity.

Further information on 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'.
Remedial

Action:
Re-program the high-voltage charger and, if necessary, other control units using the PIWIS Tester with test

software version 39.600.015 (or higher).
Affected

Vehicles:
Only vehicles assigned to the campaign (see also PCSS Vehicle Information). There are 1,486 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 a current and voltage-controlled

charge map for lithium starter batteries, e.g. VAS 5908 Battery charger 90 A
•
9900 - PIWIS Tester 3 with test software version 39.600.015
AfterSales
Aug 10, 2020

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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 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.

Check that the rechargeable battery for the PIWIS Tester is charged sufficiently. Connect the PIWIS Tester

to the power supply unit if necessary.
Aug 10, 2020

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AfterSales
Service
Technical Information
123/20 ENU
WLG6
2
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. VAS 5908 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.
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.
Re-programming high-voltage charger (OBC) control unit

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.
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Aug 10, 2020

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
Keep third parties away from the danger area.

Do not move components or tools into the danger area.
Information

In addition to programming and coding of the high-voltage charger (OBC) control unit, the guided

programming sequence within the scope of this campaign includes other control units from the VR8.7

software release. In the programming sequence, the following software versions of the individual control

units are again compared with the required status of software release VR8.7. If the actual status already

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

control units programmed in addition to the high-voltage charger control unit can vary depending on the

vehicle.

•
Control unit for high-voltage power electronics, front and rear - 0007
•
High-voltage battery control unit (BMCe) – E870
•
High-voltage converter – 0899
•
Brake booster (electric brake booster) – 0100
•
High-voltage DC charger (booster) – 0990
•
Engine electronics (DME) – 0005
•
Brake electronics (PSM) – 0094
•
Driver’s seat and passenger’s seat adjustment – 0064
•
Assistance systems (zFAS) – 0355
Work Procedure: 1
Re-program high-voltage charger control unit (OBC).

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'.

For specific information on control unit programming during this campaign, see the table

below:
Aug 10, 2020

Page 4 of 9
Required PIWIS Tester software version:
39.600.015 (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:
V6P8C
AfterSales
Service
Technical Information
123/20 ENU
WLG6
2
Read and follow the information and instructions

on the PIWIS Tester during the guided

programming sequence.
Programming sequence:
Do not interrupt programming and coding.

A backup documentation process for the

re-programmed software versions starts as soon as

programming and coding is complete.

Programming time (approx):

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