No. 32-21 Service Bulletin/Repair Instructions

Service
Technical Information
32/21
ENU
2706
2
Spare Part Requirements for 12-Volt Vehicle Electrical System Battery - Checking Software

Version and Updating it if Necessary (32/21)

Vehicle Type:
Taycan (Y1A)
Model Year:
As of 2020 up to 2021
Concerns:
Spare parts requirements for the 12-volt vehicle electrical system battery
Information:
If the 12-volt vehicle electrical system battery needs to be replaced, the software version of the

battery sensor must be checked and, if necessary, updated following installation in the vehicle.
Action required: Check software version of the battery sensor and update it if necessary.

Information

If the vehicle is affected by workshop campaign WMA5 or WMA6 and this has not yet been carried out,

the relevant workshop campaign must also be carried out during the workshop visit.

Otherwise, correct functioning cannot be guaranteed because of the different software versions in the

vehicle.
Information

The total time required for control unit programming is approx. 10 minutes.

Software:
Parts Info:
Overview of software version:

Component
SW (new)
Battery sensor
4174
Affected part numbers:

Part No.
Designation
9J1915105EY
Lithium battery (40 AH)
AfterSales
Mar 26, 2021

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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'.

•
•
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 PIWIS test software version 40.000.040 (or higher) installed.
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.

Place the driver's key with the back facing down in the area in front of the storage compartment under

the armrest (emergency start tray) in order to guarantee a permanent radio link between the vehicle and

driver's key.
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Technical Information
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ENU
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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

The procedure described here is based on the PIWIS Tester 3 software version 40.000.040.

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
Carry out general preliminary work for control unit programming as described in  Workshop

Manual '9X00IN Basic instructions and procedure for control unit programming - section on

"Preliminary work"'.
2
Connect a suitable battery charger, e.g. battery charger 90A, to the jump-start terminals and

switch it on.
3
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.
4
Connect 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.
5
Establish operational readiness (switch on ignition).
6
On the PIWIS Tester start screen, call up the 'Diagnostics' application.
Emergency start tray
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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Select Gateway control unit.

7.1
Select the 'Extended identifications' menu.
7.2
Check the software version for the battery sensor.

•
Software version is 4174: The software is already up-to-date. No further action

required.
•
Software version is not 4174: Software update required. For this purpose, re-program

the battery sensor, see  Technical Information '9X00IN Re-programming battery

sensor'.
Re-programming battery sensor

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.
Work

Procedure:
Re-program battery sensor.

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'.

Information

An actual voltage of at least 14 volts is required from the 12-volt vehicle electrical system battery for

programming the battery sensor. If this voltage is not achieved, programming cannot be performed.

For specific information on control unit programming as part of this programming process, see

the table below:
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Required PIWIS Tester software version:
40.000.040 (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:
K4M2S
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Technical Information
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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.

Software version for the battery sensor

programmed as part of this programming

process:
4174

•
•
Several control units can be updated with this

programming process, depending on the relevant

software integrated in the vehicle.

Following control unit programming, the software

version can be read out of the gateway control unit

in the 'Extended identifications' menu using the

PIWIS Tester.
Programming time (approx.):
approx. 10 minutes
Procedure in the event of abnormal termination of control unit programming:
•

•
•

Procedure in the event of error messages

appearing during the programming

sequence:
End and restore operational readiness (switch

ignition off and then on again).

Read out and erase the fault memory  Workshop

Manual '9X00IN Basic instructions and procedure

for control unit programming using the PIWIS

Tester'.

Repeat control unit programming by entering the

programming code again.
 Workshop Manual '9X00IN Basic instructions and

procedure for control unit programming using the PIWIS

Tester - section on "Fault finding"'.
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Concluding work

Work Procedure: 1
Read out and erase the fault memories of all control units.

1.1
Press •F7“ in the control unit selection screen ('Overview' menu) to call up the Additional

menu.
1.2
Select the function “Read all fault memories

and erase them if necessary” and press

•F12“ ('Next') to confirm  Erasing fault

memories.

The fault memories of the control units are

read out.
1.3
Once you have read out the fault memories,

check the fault memory entries.

Erasing fault memories

Information

If control units are found to have faults that

are not caused by control unit programming, these must first be found and corrected. This

work cannot be invoiced under the workshop campaign number.
1.4
Press •F8“ to delete fault memory entries.
1.5
Press •F12“ ('Yes') in response to the question as to whether you really want to delete all

fault memory entries.

The faults stored in the fault memories of the various control units are deleted.

Information

If fault memory entries for individual control units cannot be deleted, proceed as follows:
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•
End operational readiness (switch off ignition).
•
Disconnect the PIWIS Tester diagnostic connector from the diagnostic socket.
•
Lock the vehicle using the driver's key and remove the driver's key from the

proximity of the vehicle (approx. 10 meter/ 32.8 ft).
•
Wait approx. 15 minutes before unlocking the vehicle again.
•
Restore operational readiness (switch on ignition).
•
Plug the PIWIS Tester diagnostic connector into the diagnostic socket again and restore

communication with the vehicle.
•
Read out the fault memory again and delete any fault memory entries that are stored.
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Technical Information

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Once you have erased the fault memories,

select the 'Overview' menu to return to the

control unit selection screen  Control unit

selection.
2
End operational readiness (switch off ignition).
3
Disconnect the PIWIS Tester from the vehicle.

Information

Connect the PIWIS Tester to a network as soon as

Control unit selection

you can and log into the PPN in order to transfer the

backup documentation created during this campaign to the PAG systems.
4
Switch off and disconnect the battery charger.
Invoicing

Invoicing:
For documentation and warranty invoicing, enter the labor operations and PQIS coding specified below in

the warranty claim:
APOS
Labor operation
27060150
Checking vehicle electrical system battery

(checking software version)
27060149
Reworking vehicle electrical system battery

(programming battery sensor)
I No.
PQIS coding:

Location (FES5)
27060
Vehicle electrical system battery
Damage type (SA4)
1611
does not function
References:
 Workshop Manual '270689 Charging battery/vehicle electrical system'

 Workshop Manual '9X00IN Basic instructions and procedure for control unit programming using the

PIWIS Tester - section on "Fault finding"'.
 Workshop Manual '9X00IN Basic instructions and procedure for control unit programming using the

PIWIS Tester'
Important Notice: Technical Bulletins issued by Porsche Cars North America, Inc. are intended only for use by professional automotive technicians who have attended Porsche service training

courses. They are written to inform those technicians of conditions that may occur on some Porsche vehicles, or to provide information that could assist in the proper servicing of a vehicle. Porsche special

tools may be necessary in order to perform certain operations identified in these bulletins. Use of tools and procedures other than those Porsche recommends in these bulletins may be detrimental to the

safe operation of your vehicle, and may endanger the people working on it. Properly trained Porsche technicians have the equipment, tools, safety instructions, and know-how to do the job properly and

safely. Part numbers listed in these bulletins are for reference only. The work procedures updated electronically in the Porsche PIWIS diagnostic and testing device take precedence and, in the event of a

discrepancy, the work procedures in the PIWIS Tester are the ones that must be followed.
© 2021 Porsche Cars North America, Inc.
AfterSales
Mar 26, 2021

Page 7 of 7

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