Adding Heated Seats to your '202 Questions

[OCKlasse]

Alright, so I have some new seats going in the ride that came heated. Anyone know what else will be required to make them work besides the seat switches? Thanks!

[1995c280]

well on a 202 with factory heated seats, the wiring from the switch would probably come from the wiring harness and be time controlled by the computer. if you buy the switches, just throw them direct power and ground with a in-line fuse. only thing to remember would be to make sure you turn them off via the switch when not in use so they don't stay on and burn through the seat covers like the 163's and 210's used to.

[Logic]

Originally posted by OCKlasse
Alright, so I have some new seats going in the ride that came heated. Anyone know what else will be required to make them work besides the seat switches? Thanks!

well if you can find the switchs see if you can find the diagrams and how they were wired up. in most cases the power for they seats were proubly powered when the car was on so use a acc power source so they dont stay on. is there one or two temps on those? if there is only one i m sure the wiring would be strait forword . again when running power always use a inline fuse with the correct fuse size.....

[OCKlasse]

Originally posted by Logic
well if you can find the switchs see if you can find the diagrams and how they were wired up. in most cases the power for they seats were proubly powered when the car was on so use a acc power source so they dont stay on. is there one or two temps on those? if there is only one i m sure the wiring would be strait forword . again when running power always use a inline fuse with the correct fuse size.....

Thanks for the help guys. They have two settings, and automatically go to the lower mode. I could care less, and would just love to be able to manually turn them off and on.

[grga]

My driver's seat lower part heater doesn't work...
:-(

[martattack]

Unfortunately the heated seats aren't as simple as an on-off switch. There is actually a control box that is used with them. The switches are not normal switches either, so it can't be rigged up too easily with the factory switches. I put in some aftermarket heaters in my seats and utilized the factory switches, but it was way more complex than I thought... I programmed a PIC microcontroller (big time overkill but it works) to do the switching and such. If you have the factory heaters, try to find the control module (and harness if possible) on eBay or a wrecking yard if you can.

[OCKlasse]

I may have a little break thanks to EPC-net...

I was able to find the following part numbers needed for my car:

http://img.photobucket.com/albums/v338/trefive/SeatHeatingAccessories.jpg

along with the following diagram:

http://img.photobucket.com/albums/v338/trefive/SeatHeatingDiagram.jpg

I will need to do rewire the harness to the new seats as they are out of a W209 and the plugs will not match up...

Some questions:

Does number 63, 66 go to the switches?

Is this all you see that would be required? This is all that came up on EPC-net under the "Seat Heating" section. :confused:

[strictlyspeakin]

my wiring diags are never where i need them.

63 looks like the harness for the brain box relay to activate the seat heaters. so yes it would be connected to the switches.

if i think about it, i'll check for my diags when i get home. but it is friday night you know....

[strictlyspeakin]

as usual, it depends on the year, but it's simple enough circuit.
the '94 is more complicated.

i think that the reference to 63, 66 is there because the connector changed depending on the model year. something like: 63 being used before 97 and 66 used after.

it should be located behind the climated control module.
looks like your biggest challenges will be getting that relay for 63.
diagrams don't add much more than you already know.

2 switches connect to the relay
relay also has: 2 12v inputs from fusebox, 2 12v outputs to heaters
switches get illumination and ground.
heating elements have a ground and 12v input

[OCKlasse]

Originally posted by strictlyspeakin
as usual, it depends on the year, but it's simple enough circuit.
the '94 is more complicated.

i think that the reference to 63, 66 is there because the connector changed depending on the model year. something like: 63 being used before 97 and 66 used after.

it should be located behind the climated control module.
looks like your biggest challenges will be getting that relay for 63.
diagrams don't add much more than you already know.

2 switches connect to the relay
relay also has: 2 12v inputs from fusebox, 2 12v outputs to heaters
switches get illumination and ground.
heating elements have a ground and 12v input

Thanks for all the info! Now what about that 75? Looks like some sort of module, however it says it is not applicable to my model year? :confused:

[strictlyspeakin]

You say module, I say relay. Module, relay, brain box, it's all the same.
Something you found says that 75 wasn't applicable to your year. Ok, but there is a version of 75 that is. Depending on the year, all of the diagrams had a "75" module/relay.
Getting a "75" module/relay is the key to the whole thing.

Here are the 3 diagrams I found:
MY 1994 - 08/95
As of 09/95
As of 09/97 with CODE (873)

Each diagram has a "75".