Jump to content

Welcome to RennTech.org Community, Guest

There are many great features available to you once you register at RennTech.org
You are free to view posts here, but you must log in to reply to existing posts, or to start your own new topic. Like most online communities, there are costs involved to maintain a site like this - so we encourage our members to donate. All donations go to the costs operating and maintaining this site. We prefer that guests take part in our community and we offer a lot in return to those willing to join our corner of the Porsche world. This site is 99 percent member supported (less than 1 percent comes from advertising) - so please consider an annual donation to keep this site running.

Here are some of the features available - once you register at RennTech.org

  • View Classified Ads
  • DIY Tutorials
  • Porsche TSB Listings (limited)
  • VIN Decoder
  • Special Offers
  • OBD II P-Codes
  • Paint Codes
  • Registry
  • Videos System
  • View Reviews
  • and get rid of this welcome message

It takes just a few minutes to register, and it's FREE

Contributing Members also get these additional benefits:
(you become a Contributing Member by donating money to the operation of this site)

  • No ads - advertisements are removed
  • Access the Contributors Only Forum
  • Contributing Members Only Downloads
  • Send attachments with PMs
  • All image/file storage limits are substantially increased for all Contributing Members
  • Option Codes Lookup
  • VIN Option Lookups (limited)

Retro fit heated seats

Recommended Posts

I would like heated seats but don't want to go through the hassle of putting heaters in mine. If I get seats with the heat units present what, other than switches, would be need to complete the install? How complex are they to wire? Also are 996 and 986 seats interchangeable? Thanks,


Link to comment
Share on other sites

  • Moderators

With enought money you can do anything to a car. This guy started the project by buying the individual parts but gave up because of the cost. Dave's site

Jonathan Turner did do the retrofit on his Boxster. I have asked him in the past to put together some instructions..... Jeff

Link to comment
Share on other sites


If you buy seats that include the heaters then installation will be much easier. The under-seat wiring harnesses can be bought from Porsche for about $30/side. Depending on what exactly the seat comes to you with you may also need to purchase a pair of relays, also one per side, and in the same price range. Installing the harnesses and relays is a matter of snapping the plugs together if you have the preinstalled seat-heaters.

Installing the switches to replace the switch blanks is trivial.

The challenging part will be the wiring running between seat harnesses and switches. It is simple wiring, power, ground, and two relay settings, but difficult to run cleanly. Wiring flows from the seats out to the door sills, runs under the door sills up to the under-dash bundle, across to behind the AC control unit, and then down to the switches. The under seat/door sill part is relatively easy, the under-dash wiring is a chore. Tie wraps and creativity work just fine though. After running a non-factory path for a year and a half I eventually pulled the entire dash off and rewired it along the factory bundle (I needed to remove the dash for another reason anyway) just to satisfy my need for elegant implementation :)

On the driver's side, you will need to tie power for both seats into the fuse block. There are power wires available to tap into. I wanted to go into the stock location on the block so I trimmed a non-stock metal connector to fit the fuse block in the correct location. I have not yet found a part number for the stock connector.

So the summary is, still a pain, but I feel it was worth it.

Another alternative might be to order a new dash harness that includes seat heating (and whatever else you desire, e.g. auto-dimming mirror, cell-phone hook-up, etc).

Or trade for a model that has the heated seats already :)

Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.