Removing And Installing Control Unit For The Telephone: Notes

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2004 Porsche Boxster, 2003 Porsche Boxster, 2002 Porsche Boxster, 2001 Porsche Boxster, and 2000 Porsche Boxster. However, it is still accessible from the selected car via links, so may be relevant.

Remove right front seat. Refer to REMOVING AND INSTALLING FRONT SEAT - AS OF MY 1996 .
Switch ignition off, remove key, switch off the PCM or the radio.