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WRC3 - Re-Programming Rear-End Electronics Control Unit (BCM2) (Stop Delivery)

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:

2025

Model Line:

Taycan (Y1A/Y1B)

Concerns:

Control unit for rear-end electronics

Cause:

At the market launch of the new Taycan, software updates are available for the rear-end electronics control unit (BCM2) in the affected vehicles.

Action:

•
•

Affected
Vehicles:

Re-program the rear-end electronics control unit with the latest PIWIS Tester software release in
each instance.
Minimum requirement: Release 42.600.030

Only vehicles assigned to the campaign (see also PCSS Vehicle Information).

Required tools
Tools:

•
•

P90999 - PIWIS Tester 4
Battery charger with a current rating of at least 90 A, e.g. VAS 5908 - battery charger 90 A

Re-programming rear-end electronics control unit (BCM2)
Work Procedure: 1

2

The prerequisites for control unit programming are described in the Workshop Manual  Workshop
Manual '9X00IN Basic Instructions and Procedure for Control Unit Programming Using the PIWIS
Tester'.
After the backup documentation process, the integration test is started automatically. The result
must first be ignored.

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Place the original remote control in the emergency
start tray. Emergency start tray

4

Re-program rear-end electronics control unit
(BCM2).

Emergency start tray
Required PIWIS Tester software release:

42.600.030 (or higher)

Type of control unit programming:

Control unit programming using the ‘Automatic
programming’ function in the rear-end elektronics control unit.

Programming sequence:

Read and follow the information and
instructions on the PIWIS Tester during the
guided programming sequence.
Do not interrupt programming and coding.
A backup documentation process for the
re-programmed software releases starts as
soon as programming and coding is complete.

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Programming time (up to):

10 minutes

Procedure in the event of error messages
appearing during the programming sequence:

 Workshop Manual '9X00IN Basic instructions

Procedure in the event of a termination in the
control unit programming:

Repeat control unit programming by restarting
programming.

and procedure for control unit programming
using the PIWIS Tester'

Read out and delete all control unit fault memories.
5.1

In the control unit selection (‘Overview menu’) press •F7“ to call up the Additional menu.

5.2

Select the function “Read all fault memories and delete if necessary” and press •F12“
(“Next”) to confirm.

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Press •F3“ to start the integration test in the control unit selection.
All affected control units should now be successfully programmed or checked in the control unit
overview and their status.
Information
If a deviation in the integration test is still indicated despite programming being carried out, this must
be repeated. If the deviation persists, contact Technical Support.

7

Enter the campaign in the Warranty and Maintenance logbook.

Warranty processing
Scope 1:

Re-programming rear-end electronics control unit
Labor time:
Re-programming rear-end electronics control unit
Includes:
Connecting and disconnecting battery charger
Connecting and disconnecting PIWIS Tester
Reading out and deleting fault memories

Labor time: 57 TU

 Damage number WRC3 066 000 1

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.

© 2024 Porsche Cars North America, Inc.

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