4/18/2018 Heated Seats w/ OEM SwitchesThis is one I have been trying to figure out for years. It wasn't until I really took the time to get into the electronics of the 986, that I was finally able to figure it out. I won't be doing this mod anytime soon, so it has not been tested, but I wanted to share, since I find some of the other heated seat directions that use OEM switches to be very confusing. Since this is untested, use these instructions at your own discretion, I take no responsibility for whether this will work on not, but I think it should. ----------------------------------------
Now if you are interested in adding heated seats to your 986 or 996, you have probably seen the DIY from Dennis Vogel which is extremely thorough and installs heated seats as closely as possible to how they would have come from the factory. I found the instructions very confusing with lots of wires running all over the place. I was finally able to distill it down into a less original mod that is much simpler, and also cheaper using Dennis' guide and my Bentley manual. You can buy aftermarket seat heaters and use the switches they come with, but if you want OEM switches, you also need to use OEM relays. Basically this version of the modification cuts most of the wires running all over the place from Dennis' version, and eliminates the very expensive wiring loop. I have not tested this, but it should be helpful. The OEM seat heater switch has 5 pins: Switch Pin 1 - Relay Pin 7 Switch Pin 2 - Relay Pin 4 Switch Pin 5 - Relay Pin 2 Switch Pin 3 - Illumination+ (from Cigarette Lighter or Other Dash Button) Switch Pin 4 - Ground The Relay has 6 Pins: Relay Pin 2 - Switch Pin 5 Relay Pin 3 - Power to Seat Heater Element Relay Pin 4 - Switch Pin 2 Relay Pin 5 - Wire to Fuse A6 Relay Pin 7 - Switch Pin 1 Relay Pin 9 - Ground The Heater Element has 2 Pins: Power - Relay Pin 3 Ground - Relay Pin 9 To try and explain what is going on here. Pins 1, 2, 5 from the switch are controlling the relay. Pin 3 & 4 from the switch are being used for nighttime illumination of the switch independent of everything else. On the Relay, Pins, 2, 4, 7 are taking commands from the switch, and triggering the two different lights inside the switch depending on whether the seat heater is set to high, low, or off. On the relays, Pin 5 is taking power from Fuse A6. That power is going to the the seat heater element on relay pin 3. Relay pin 9 is a ground. So how would you wire this, it's pretty simple: Using female disconnects wire: Switch Pin 2 to Relay Pin 4 Switch Pin 1 to Relay Pin 7 Switch Pin 5 to Relay Pin 2 Switch Pin 4 to Relay Pin 9 Switch Pin 3 to Illuminated Ground from the Cigarette Lighter or Other Button Also using disconnects wire: Relay Pin 3 to the Seat Heater Element Power Ground Wiring Several things need to be grounded here. If you connect Switch Pin 4 to Relay Pin 9, you can then splice a wire into that ground connection, and connect it to the ground required for the Seat Heater Element. You will also want to splice a wire in to connect to a body ground point. Power Relay Pin 5 is the one that draws power, which it does straight from the fuse panel. I suppose you could use a 12V source, but it doesn't seem every hard to do this step the original way and have a regular fuse in the fuse panel. Connect a female disconnect on one end of a wire to connect to relay pin 5, run that wire to the fuse panel. You will then need to splice on an Audi wire (PN: 000-979-227), that can be inserted into the top position of empty Fuse slot A6. The bottom of A6 is already jumpered with Fuse A7. Once you insert a 25A fuse, the relay will be able to draw power. Comments are closed.
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