Affected pins

Plug 'A' on vehicle electrical system control module:

• Pin 1 'CAN comfort (high)'
• Pin 2 'CAN comfort (low)'
• Pin 21 'input for terminal 15 signal/fuse carrier at left of dashboard (F53)'

Plug 'C' on vehicle electrical system control module:

• Pin 5 'ground input (terminal 31) MB 23'

Plug 'K' on vehicle electrical system control module:

• Pin 1 'input for terminal 30 power supply, interior lights (fuse carrier at left of dashboard, F12)'. The vehicle electrical system control module is also supplied via the interior light power supply. An interior light failure would also indicate a failure of the vehicle electrical system control module.

Plug 'P' on vehicle electrical system control module:

• Pin 13 'input for terminal 30 power supply (fuse carrier at left of dashboard, F36)'
• Pin 15 'input for terminal 31 ground'

  Diagnostic box in driver's footwell 

  Fig 1: Identifying Diagnostic Box Terminals

  Courtesy of PORSCHE OF NORTH AMERICA, INC.
  DIAGNOSTIC BOX PIN DESIGNATION
  
  

  Pin	Designation	Pin	Designation
  1	Terminal 15	9	Not used
  2	Not used	10	Not used
  3	K' line (communication with Tester)	11	Not used
  4	Ground	12	Not used
  5	Ground	13	Not used
  6	CAN high diagnosis (instrument cluster)	14	CAN low diagnosis (instrument cluster)
  7	Kline	15	Not used
  8	Not used	16	Terminal 30