9

Service

Technical Information

9152
Ambient Lighting Adjustment for Cup Holder / Center Console Not Possible Via Front Display and
Control Panel: Check and Update Software Release of Front-End Electronics (BCM1) Control Unit if
Necessary (51/25)

51/25

ENU

Model Line:

Taycan (Y1A / Y1B / Y1C)

Model Year:

As of 2020 up to 2021

Equipment:

Interior lighting, basic + ambient lighting (M-no. QQ1)

Concerns:

Central computer

Cause:

The customer complains that the ambient lighting for the cup holder and the center console cannot be
adjusted via the respective menu item in the front display and control panel.
The ambient lighting for the cup holder can be incorrectly set via the menu item "Roof console" and the
ambient lighting for the center console via the menu item "cup holder".

Cause:

The coding of the front-end electronics (BCM1) control unit refers to the incorrect menu items in the front
display and control panel and causes this fault pattern.

Action:

If a customer complaint exists, check the software release of the front-end electronics (BCM1) control unit
and re-program or re-code the front-end electronics (BCM1) control unit using the PIWIS Tester, depending
on the software release.
Information
The minimum programming / coding requirement is the PIWIS Tester software release 43.400.040 (or
higher)

Information
After coding has been completed, the ambient lighting can be adjusted using the appropriate menu items
"Cup holder" and "Center console" in the front display and control panel.

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 battery and vehicle electrical system'

AfterSales

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9

Service
9152

ENU

Technical Information

51/25

Checking software release of front-end electronics (BCM1) control unit
Work Procedure: 1

Perform general preliminary work for control unit programming accordingly.

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

on "Preliminary work"'
2

Check software release of front-end electronics (BCM1) control unit.
2.1

In the 'Overview' control unit selection, select the 'Front-end electronics (BCM1)' control unit
and press •F12“ ('Next') to confirm.

2.2

Select the 'Extended identifications' tab and check the software release.
Assessment
The software release is lower than
“0712”.

Action
Re-program front-end electronics (BCM1)
control unit.
As part of the programming sequence, the
necessary coding takes place automatically.
Continue with:
⇒ Technical Information '9X00IN Re-program
front-end electronics (BCM1) control unit'

The software release is “0712” (or
higher).

Re-code front-end electronics (BCM1) control
unit.
Continue with:

⇒ Technical Information '9X00IN Re-coding

front-end electronics (BCM1) control unit'

Re-program front-end electronics (BCM1) control unit
Work Procedure: 1

Re-program front-end electronics (BCM1) control unit.
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'

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AfterSales

Service

Technical Information

51/25

ENU

9152

9

Specific information on control unit programming in the context of this Technical Information:
Required PIWIS Tester software release:

43.400.040 (or higher)

Type of control unit programming:

Control unit programming using the 'A utomatic
programming' function of the control unit:
'Front-end electronics (BCM1)' control unit –
'Coding / programming' menu – 'A utomatic
programming' function.

Programming sequence:

Read and follow the information and instructions
on the PIWIS Tester during the guided
programming sequence.
During the programming sequence, the control
unit is re-programmed and then automatically
re-coded.
Do not interrupt the programming and coding
process.
Backup documentation for the re-programmed
software releases starts after programming.

Programming duration:

Programming takes up to 15 minutes, depending
on equipment.

Software programmed during this action:

• Front-end electronics (BCM1) control unit
Software release: 0712 (or higher)
Following control unit programming, the software
release can be read out from the relevant control
unit using the PIWIS Tester in the menu ⇒ 'Incremented identifications'.

Procedure in the event of error messages
appearing during the programming sequence:
Procedure in the event of a termination in the
control unit programming:

⇒ Workshop Manual '9X00IN Basic instructions

and procedure for control unit programming using
the PIWIS Tester'
Repeat control unit programming by restarting
programming.

2

Read out and delete all control unit fault memories.

3

End diagnostic application, end readiness for operation and disconnect P90999 - PIWIS Tester 4 from
vehicle.

4

Switch off and disconnect the battery charger.

⇒ Workshop Manual '270689 Charging vehicle electrical system battery'
End of action.

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9152

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Technical Information

51/25

Re-coding front-end electronics (BCM1) control unit
Work Procedure: 1

Re-code front-end electronics (BCM1) control unit.
The basic procedure to follow for control unit coding is described in the Workshop Manual.

⇒ Workshop Manual '270689 Basic instructions and procedure for control unit programming using the

PIWIS Tester'

Specific information on control unit coding in the context of this Technical Information:
Required PIWIS Tester software release:

43.400.040 (or higher)

Type of control unit coding:

Control unit coding using the ‘Automatic coding’
function for the control unit:
'Front-end electronics (BCM1)' control unit – 'Coding
/ programming' menu – 'A utomatic coding' function.

Coding sequence:

Read and follow the information and instructions on
the PIWIS Tester during the guided coding sequence.
Do not interrupt the coding process.
When coding is complete, the message “Coding has
been completed successfully” is displayed and a tick
appears in the “Status” box.

Procedure if control unit coding is not
successful:

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Repeat control unit coding.

2

Read out and delete all control unit fault memories.

3

End diagnostic application, end readiness for operation and disconnect P90999 - PIWIS Tester 4 from
vehicle.

4

Switch off and disconnect the battery charger.
⇒ Workshop Manual '270689 Charging vehicle electrical system battery'

AfterSales

Service

Technical Information

51/25

ENU

9152

9

Labor position and PCSS encryption
Labor position:
APOS

Labor operation

94492542

Re-coding front-end electronics (BCM1) control
unit

94492541

Re-program front-end electronics (BCM1) control
unit

I No.

PCSS encryption:
Location (FES5)

91520

Central computer

Damage type (SA4)

1134

programming error

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.

AfterSales

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