NHTSA ID Number: 10252437
Manufacturer Communication Number: No. 208-23
TSB/Document Date: 2024-04-02
Summary
Technical information on WPS9 - reprogramming thermal management control unit
Service
Technical Information
208/23 ENU
WPS9
1
WPS9 – Re-Programming Thermal Management (TME) Control Unit (Workshop Campaign)
Revision:
This bulletin replaces bulletin Group 1 208/23 WPS9, dated February 8, 2024.
Model Year:
As of 2020 up to 2025
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 Line:
Taycan (Y1A/Y1B/Y1C)
Concerns:
Thermal management control unit (TME)
Cause:
Optimized software is available for the thermal management (TME) control unit to increase the
robustness of the electric passenger compartment heater.
Actions:
•
•
Affected
Vehicles:
Re-program the thermal management (TME) control unit and HV heater with the latest PIWIS Tester
software release.
Minimum requirement: Release 42.500.000
Only vehicles assigned to the campaign (see also PCSS Vehicle Information)
Required tools
Tools:
•
•
Battery charger with a current rating of at least 90 A, e.g., VAS 5908 battery charger 90 A
P90999 - P90999 - PIWIS Tester 4
Re-programming thermal management control unit (TME)
1
The prerequisites for control unit programming are described in the Workshop Manual Workshop
Manual 'Basic Instructions and Procedure for Control Unit Programming Using the PIWIS Tester'.
2
After the backup documentation process, the integration test is started automatically. The result
must first be ignored.
AfterSales
Mar 4, 2024
Page 1 of 4
1
Service
Technical Information
ENU 208/23
WPS9
Information
Please note that the electric passenger compartment heater is also programmed as part of the thermal
management programming process. For programming the electric passenger compartment heater, it
is necessary to first deactivate the high-voltage system (see =>Workshop Manual '2X00IN Deactivating/
commissioning high-voltage system'). This information can also be found in the PIWIS Tester as required
preliminary work before the programming process.
3
Re-program thermal management control unit (TME) and HV heater.
Required PIWIS Tester software release:
42.500.000 (or higher)
Type of control unit programming:
Control unit programming using the “Automatic
programming” function of the thermal
management (TME) 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.
Programming time (up to):
20 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'
Additional instructions for aborted programming
Technical Information '9X00IN Additional
instructions if programming is aborted'
Mar 4, 2024
Page 2 of 4
AfterSales
Service
Technical Information
208/23 ENU
WPS9
Control Unit
Model year
Hardware Version
Latest Software
Version*
Thermal management
(TME)
2020-2024
H08, H09, H10
0325
Electric A/C
compressor
2020
H03
0114
Electric A/C
compressor
2020-2021
H04, H05
0117
Electric A/C
compressor
2022-2024
H05
0117
Electric interior heater
(HV-PTC)
2020-2021
0015
Electric interior heater
(HV-PTC)
2020-2024
0017
1
*Latest Software versions as of Tester version 42.500.000
4
Read out all fault memories. If necessary, work through existing faults and delete them.
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.
5
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.
6
Enter the campaign in the Warranty and Maintenance logbook.
AfterSales
Mar 4, 2024
Page 3 of 4
1
Service
WPS9
Technical Information
ENU 208/23
Warranty processing
Scope 1:
Re-programming thermal management control unit (TME)
Labor time:
Re-programming thermal management control unit (TME)
Includes:
Connecting and disconnecting battery charger
Connecting and disconnecting PIWIS Tester
Deactivating and commissioning high-voltage system
Reading out and deleting fault memories
Labor time: 117 TU
Damage number WPS9 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.
Mar 4, 2024
Page 4 of 4
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TSB/Document ID: No. 208-23
Replacement Service Bulletin Number:
MFR Communication Date: 2024-03-04
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: ELECTRICAL SYSTEM
MFR Component System:
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