Technical Service Bulletin # 939/12 Date: 120514
Brakes - Brake Light ON/DTC 4340 Stored
39/12 ENU 9436 9
May 24, 2012
The present document was valid at the time of print. A later version may be available online
Adjusting Brake Light Switch For Complaint "Brake Light Stays on"/Fault Code 4340 (39/12)
Tools
Model year: as of 2010
Vehicle Type: Panamera/Panamera S/Panamera Turbo
911 Carrera (991)/911 Carrera S (991)
Boxster (981)/Boxster S (981)
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 --> 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
References:
Porsche Panamera S (970) V8-4.8L Page 5
--> 943619 Removing and installing brake light switch\
Model year as of 2010
C02, C36