No. 65-23-1 Service Bulletin/Repair Instructions

Service
Technical Information
65/23
ENU
9152
9
Various Fault Patterns for Porsche Communication Management (PCM) with Software

Version 37xx: Perform a Software Update (65/23)

Model Line:
911 (992)
Model Year:
As of 2022 up to 2023
Concerns:
Control unit for central computer (PCM)
Cause:
The PCM cannot be switched on or fails intermittently during vehicle operation. Possible error

patterns:

•

•

•

•
PCM screen remains black

There is no sound output and hands-free device is faulty

Navigation display fails

The PCM can only be started again after some time or starts up again on its own
On vehicles with BOSE® Surround Sound System (M-No. 9VL) or Burmester® 3D High-End

Surround Sound System (M-No. 9VJ), the sound settings in the main menu >> Media >>

Bose/Burmester may also be lost after bus rest:

•

•

•
No longer ticked on the “Heights and depths” settings

No longer ticked on the settings “Balance and fader”

Setting the bars to “0”
Real Time Traffic display does not show traffic jams in the text in the route monitor.

Action:
In the event of a complaint, re-code the central computer (PCM) with the latest PIWIS Tester software

version.

Information

The minimum requirement for coding is the PIWIS Tester software version 42.000.030.
Required tools

Tools:
•

•

•
P90999 - P90999 - PIWIS Tester 4

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

USB storage medium Type A+C 32 GB (for PCM update), Part-No. V04014999WW000,

already available at the Porsche Center
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Overview of PCM update

Information

The central computer (PCM) software update is performed using a USB storage medium. The software

release that is specific to each region must be downloaded using the software tool PiUS (Porsche integrated Update Service) and must be installed on a blank USB storage medium.

Pay particular attention to the following:

•
For this PCM software update, a USB storage medium 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 listed here may only be used for the action described here. Damage to the central

computer cannot be ruled out if the software is used on other vehicles.

You will find further information on installation and use for the PiUS software tool in the PPN portal under

*PiUS (Porsche integrated Update Service) goes live*.
Overview:
Part No.
Designation

– Region
Vehicle allocation
9Y2909000M
USB storage medium for PCM

update

– North America

– Mexico
I-No. ER3 / ER4
Re-programming central computer (PCM) control unit

Information

Before starting programming, particular attention must be paid to the following:
Jul 26, 2023

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•
Switch off the charger off and on once; the battery charger display must be off before starting it

again, because the battery charger automatically switches to trickle charge after 5 hours (default

setting in the charger).
•
The charger must be set to 14.6 V charging voltage and operated in charging mode.
•
Vehicles with a PVTS contract must be activated for Service mode.
•
The PIWIS Tester must not be charged using the cigarette lighter!
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Technical Information
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Information

If Privacy mode is not active, programming may be aborted, resulting in a defect in the central computer

(PCM).
Information

If control units are found to have faults that are not caused by control unit programming, these must first

be found and corrected.

Work procedure: 1
Unless otherwise already done, prepare USB storage medium with the software required for the

PCM central computer depending on the country variant in accordance with the above overview.
 Technical Information 'Overview of PCM update'

2
The basic procedure for control unit programming is described in the Workshop Manual 

Workshop Manual 'Basic Instructions and Procedure for Control Unit Programming Using the PIWIS

Tester'.
3
Select Guest account from the central display (PCM) and activate Privacy mode (available in some

countries).
4
Re-program main computer (PCM).

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

below.

Required PIWIS Tester software version:
41.900.040 (or higher)
Type of control unit programming:
PCM central computer update using PIWIS

Tester start code to start the guided

programming sequence. The PCM application

software is loaded via USB storage medium.

In the control unit selection (‘Overview’ menu)

select the PCM central computer control unit

and select the ‘Service/repairs’ menu.

Select the ‘Install software update’ function

and press •F12“ (‘Next’) to perform the

software update.

X3G5A
Programming code:
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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 once

programming and coding is complete.

North America/Mexico (M-No.

ER3/ER4): 9Y2909000M / 3849
Required software (part number and software

version):
•
Programming time (up to):
25 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 - section on “Fault finding”'
Additional instructions for aborted programming

 Technical Information '9X00IN Additional

information if programming is aborted'

Integration test procedure:
•
The integration test shows a green result

regardless of this update
5
Read out all fault memories, process and delete existing faults if necessary.
6
Press •F3“ to start the integration test in the control unit selection.

All affected control units should now be successfully re-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.
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7
End the diagnostic application. Switch off the ignition. Disconnect the Tester from the vehicle.
8
Set battery charger back to a charge voltage of 14.4 volts.
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Additional instructions if programming is aborted

Information

If individual programming steps or reworking could not be carried out correctly, see Workshop Manual for

the basic procedure for control unit programming using the PIWIS Tester  Workshop Manual '9X00IN

Basic instructions and procedure for control unit programming using the PIWIS Tester – section on “Fault

finding”'

In the event of a fault, logging must always be created during programming using •Ctrl“and •L“using

the PIWIS Tester.
Notes:
Control unit:
Situation:
Action:
Cancelling individual control

units:
One or more control units

cannot be programmed or can

no longer be accessed
•
•
•
•
Check on whether the

control unit can be

accessed using the PIWIS

Tester or if bus idle does not

have to be carried out

Control unit still not

accessible –> Remove

fuse for control unit –>

Ignition on –> Ignition off

–> Re-insert fuse

Control unit still not

accessible –> Disconnect

battery overnight

Check whether the control

unit is accessible
Central computer (PCM)
The central computer freezes

while loading
•

•
Starting programming again

Performing PCM factory

reset using the guided PIWIS

Tester procedure
Central computer (PCM)
The central computer control

unit cannot be accessed
•
Pulling out fuse for central

computer control unit –>

Ignition on –> Ignition off –>

Re-insert fuse
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Central computer (PCM)
Programming of the central

computer (PCM) aborts when

Fault 33 is detected
•
•
•
Fault 33 is displayed in the

central computer display

during programming

Start the update in the

Developer menu on the

central computer (PCM).

The update may only be

started from the Developer

menu in this case because

the PCM is already in the

Developer menu

If the update still cannot

be performed –> replace

central computer (PCM)
Central computer (PCM)
No start of programming
•
Programming is started

via the additional menu and

not in the central computer

(PCM) control unit under

Service / repairs as

described in the TI
Central computer (PCM)
Programming is not started or

programming is interrupted
•
For other topics that are

not listed in the TI, a PRMS

ticket must be created

before replacing the PCM

system
Labor position and PCSS encryption

Labor position:

APOS
Labor operation
91522520
Programming central computer
I No.
PCSS encryption:

Location (FES5)
91520
Central computer
Damage type (SA4)
1614
function not as per specification
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.
© 2023 Porsche Cars North America, Inc.
Jul 26, 2023

Page 6 of 6
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