SB-10044348-2902

Service

Technical Information

39/12 ENU

9436

9

Adjusting Brake Light Switch For Complaint "Brake Light Stays on"/Fault Code 4340
(39/12)
Vehicle Type:

Panamera/Panamera S/Panamera Turbo
911 Carrera (991)/911 Carrera S (991)
Boxster (981)/Boxster S (981)

Model Year:

As of 2010

Concerns:

Brake light switch

Information:

Possible replacement of perfectly functioning components when complaint "Brake light stays
on" is received/fault code 4340 in PSM control unit.

Action
Required:

If the following complaints are received or if the following warnings are displayed (possible individually or
together):
•
•
•
•
•

Brake light stays on,
warning message “PSM failure” activated in the instrument cluster,
warning message “Start/stop operation deactivated” activated in the instrument cluster or
the fault code 4340 is entered in the PSM control unit
only for 911 Carrera/Boxster (9x1) vehicles: the fault code P0571 is entered in the DME
control unit

⇒ ... Before performing any other work (e.g. on the pedal bearing block or brake light switch holder):
•
•
•

The adjustment value of the brake light switch must be checked,
the actual value must be documented in the related PIWIS job (PQIS) and
then set according to specifications if necessary, see ⇒ Workshop Manual ’943619 Removing
and installing brake light switch’, section on "Adjusting" ⇒ also document the nominal value that
is set in the related PIWIS job (PQIS).

Parts Info:

970.606.451.00 ⇒ Sensor (brake pedal)

Tools:

PIWIS Tester II 9818

2012© Porsche Cars North America, Inc.

AfterSales

May 24, 2012
Page 1 of 2

9

Service
9436

References:

ENU

Technical Information

39/12

⇒ Workshop Manual ’943619 Removing and installing brake light switch’

Important Notice: Porsche Cars N.A Technical Bulletins are intended for use by professional technicians, not a "Do-it-yourselfer." They are written to inform these technicians of conditions that may
occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Special tools may be required to perform certain operations identified in these bulletins. Use of tools
and procedures other than those recommended in these bulletins may be detrimental to the safe operation of your vehicle. Properly trained technicians have the equipment, tools, safety instructions
and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your Porsche Dealer for
information on whether your vehicle may benefit from the information. Part numbers listed in these bulletins are for reference only. Always check with your authorized Porsche dealer to verify correct part
numbers.
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Dealership
Distribution
Routing

Service Manager

_______

Shop Foreman

_______

Service Technician

________

_______

_______

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Asst. Manager

_______

Warranty Admin.

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Service Technician

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recommends seat belt usage and observance of traffic laws at all times.
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May 24, 2012
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AfterSales

2012© Porsche Cars North America, Inc.