|
Ok, I figured it out.
If you have fully loaded seats equippied (airbag, motorized, heated) you will have a big ECU under the seat A187 (Driver side) with a ton of plugs going in and out of it.
Reading the diagrams in ISTA, you only need connector X733 (seat pad / heat sensor), X732 (rear pad) and X13709 (input from car / yellow plug). The rest are for motors, airbag stuff, etc. With the connectors facing you, it goes X13617 / X733 (3 pin) / X732 (2 pin) / X13709 (5 pin)
I connected X13709 to the car (Power / CAN) and X733 to the seat pad and a 10k ohm thermistor, and X732 to the rear pad. Polarity doesn't matter. The pads are driven via PWM.
The thermistor connects to pin 3 on X733. You can opt to just leave it there which isn't safe, or you can stuff it in the seat where it will actually monitor the temps and shut down the system if it gets too hot. Your call.
Hope this helps someone in the future retrofitting a generic seat heating pad (two wire).
|