Heated Seat Automatically Turns On

DomT101 · 14th June 2022, 12:32

My driver-side heated seat automatically turns on by itself occasionally! Usually when the ignition is first turned on but also sometimes when driving.

I've changed to switch in centre console, but the heated seat still has a mind of its own. Any advice on what to look for? A grounding issue maybe?

allywh · 14th June 2022, 20:05

I had the seat adjustment fuse blowing as soon as it was replaced. It was traced to a fault in the wiring under the seat. A 12 v seat adjustment feed wire and an earth wire both had the insulation worn away and were touching causing a short. I assumed this happened when the seat was moved causing the wires to chafe.
If the seat heating earths through the switch then the insulation of the wire to the switch under the seat might have worn and is touching an earth. Not a lot of room under the seat but worth a look.

14th June 2022, 12:32	#1
DomT101 Newbie MG Zt 260 Join Date: Jan 2022 Location: Thatcham Posts: 11 Thanks: 0 Thanked 0 Times in 0 Posts	Heated Seat Automatically Turns On My driver-side heated seat automatically turns on by itself occasionally! Usually when the ignition is first turned on but also sometimes when driving. I've changed to switch in centre console, but the heated seat still has a mind of its own. Any advice on what to look for? A grounding issue maybe?

14th June 2022, 20:05	#2
allywh Newbie rover 75 tourer Join Date: Aug 2014 Location: Livingston Posts: 13 Thanks: 0 Thanked 1 Time in 1 Post	I had the seat adjustment fuse blowing as soon as it was replaced. It was traced to a fault in the wiring under the seat. A 12 v seat adjustment feed wire and an earth wire both had the insulation worn away and were touching causing a short. I assumed this happened when the seat was moved causing the wires to chafe. If the seat heating earths through the switch then the insulation of the wire to the switch under the seat might have worn and is touching an earth. Not a lot of room under the seat but worth a look.