Heated seats.

[Moomoo]

On a ‘91, 240, does the actuation of the heated seats depend upon the seat belt warning wiring being attached? I’ve unplugged mine.

I have power there, and the resistance values are about right but they don’t work.

[Clifford Pope]

You mean does the seat only warm up if there is someone sitting in it?

That's a bit too clever I think. It would mean if you got out into the blizzard to shovel away some snow the seat would have gone cold when you got back in!

[Moomoo]

Yes , I see what you mean!

Over thinking it!👍

[loki_the_glt]

I don't think it does; more likely is that the heating elements are defunct.
Do you have continuity across the heater elements themselves as well as power at the connection?

[Moomoo]

There is resistance. My brother who knows about these things, measured it and said it is about what one would expect it to be.
I told they are thermostatically controlled. It certainly has been cold enough.

Sorry to be vague.

[loki_the_glt]

Originally Posted by Moomoo

There is resistance. My brother who knows about these things, measured it and said it is about what one would expect it to be.
I told they are thermostatically controlled. It certainly has been cold enough.

Sorry to be vague.

Not at all. They have a thermal cut-out IIRC, but will stay on for quite a long time, long enough to gently toast one's nether regions. You would probably have to consult the wiring diagram to see whether the seat-belt warning circuit also feeds any relay/timer control.

[Moomoo]

Aye , I’ll delve a bit deeper!👍

[timetrip]

I read somewhere that you can bypass the thermo switch ...but you have to turn them off manually...or get roasted ..lol