Service

Technical Information

34/25

ENU

9102

9

Failure of One or More Cameras (Real Top View) in the PCM Central Display (34/25)
Model Line:

Taycan (Y1A/Y1B/Y1C)

Model Year:

2025

Equipment:

ParkAssist incl. Surround View (M No. KA6)

Concerns:

Central control unit for assistance systems (zFAS)

Cause:

The customer complains about a sporadic, partial or complete failure of the Real Top View view in the PCM
central display. In addition, one or more of the fault memory entries listed below are stored in the control
unit for assistance systems:
•
•
•
•
•
•
•
•
•
•
•
•
•

B200FFA - Surround view camera internal malfunction
B127C04 - Front camera defective
B127D04 - Reversing camera defective
B127E04 - (left) side camera defective
B127F04 - (right) side camera defective
B127C54 - Front camera, calibration
B127D54 - Reversing camera, calibration
B127E54 - Side camera (left), calibration
B127F54 - Side camera (right), calibration
C12AF02 - Rear surround view camera, video line, signal error
C12AE02 - Front surround view camera, video line, signal error
C12B002 - Left surround view camera, video line, signal error
C12B102 - Right surround view camera, video line, signal error

Cause:

The complaints can be triggered by implausible communication breaks or interruptions between the camera
heads and the control unit for assistance systems.

Action:

If there is a customer complaint, check plugs of the relevant video lines and the relevant video lines and,
thereafter, re-program the assistance systems control unit depending on the respectively installed hardware
of the assistance system control unit.

Required tools
Tools:

•
•

P90999 - PIWIS Tester 4
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. For further information about the
battery chargers to be used, see the corresponding Workshop Manual. ⇒ Workshop Manual '270689
Charge vehicle electrical system battery'

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Service
9102

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Technical Information

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Check plug, video line and hardware control unit and, if necessary, re-program assistance systems control unit
Action:

1

Check plug of the relevant video lines for tightness, damage and moisture entry/corrosion traces and
replace if necessary.

2

Check relevant video lines for damage, crushing and tension-free installation. If necessary, adjust line
laying or replace if damaged.

Information
All currently available analysis results show that a replacement of the cameras and/or of the assistance
systems control unit is not expedient and does not lead to a sustainable elimination of the customer
complaint.
3

4

Review the hardware status of the assistance systems control unit using the extended identifications
with the PIWIS Tester.
Hardware version for assistance systems
control unit

Action

Hardware version H10 or H11

Re-program control unit for assistance systems.
Continue with Step 4.

Re-program control unit for assistance systems.
The basic work 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'
Specific information on control unit programming as part of this Technical Information:
Required PIWIS Tester software release:

43.500.030 (or higher)

Type of control unit programming:

Control unit programming using the "Automatic
programming" function in the assistance systems
control unit.
"A ssistance systems" control unit –
"Coding/programming" menu – "Automatic
programming" function.

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Technical Information

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Programming sequence:

ENU

9102

9

Read and follow the information and instructions on
the PIWIS Tester during the guided programming
sequence.
To start with, the assistance systems control unit is
re-programmed during the programming sequence.
The control unit is then automatically re-coded.
Do not interrupt the programming and coding
process.
Once the control units have been programmed and
coded, you will be prompted to switch the ignition off
and then back on again after a certain waiting period.
Finally, backup documentation of the new software
versions is completed.

Programming duration:

Programming takes up to 100 minutes, depending on
the equipment.

Software release programmed during this
programming:

Control unit for assistance systems
Software release: 0511 (or higher)

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

⇒ Workshop Manual '9X00IN Basic instructions and

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

Repeat control unit programming by restarting
programming.

procedure for control unit programming using the
PIWIS Tester'.

5

Read out all fault memories, process and delete existing faults if necessary.

6

End the diagnostic application. Switch off the ignition. Disconnect P90999 - PIWIS Tester 4 from the
vehicle.

7

Switch off and disconnect the battery charger.

⇒ Workshop Manual '270689 Charge vehicle electrical system battery'

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Technical Information

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PCSS encryption
Labor position:
APOS

Labor operation

91022540

Program central assistance systems control unit

I No.

PCSS encryption:
Location (FES5)

91020

Central control unit for assistance systems

Damage type (SA4)

1613

not fully functioning

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.

© 2025 Porsche Cars North America, Inc.

Aug 04, 2025
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