Heated seats fuse keeps popping

Rsnail · 24th April 2021, 22:18

Hi, so long story short, after finding the passenger side electric seat not working, I traced the problem to a blown fuse (n. 25 I think it was), changed that, and fee deconds after, it popped again, changed again, same happened, what do you think could most likely cause it and how can it be resolved? I have a european LHD car if that matters.

SD1too · 25th April 2021, 06:47

Fuses blow when too much current passes through them due to low resistance in the circuit. This is typically caused by a short circuit to earth. But first you'll have to be more precise about which fuse is affected. On your 2000 car passenger compartment fuse 25 is listed as "ignition switch".

Simon

Rsnail · 25th April 2021, 09:24

Hi, just looked at the passenger side fuse box panel, and I am positive, it is fuse n. 25, heated seats fuse, it also has a drawing of a seat with 3 curved lines coming out of the seat like that'd be the heat haha. Anyways, I replaced the 20A fuse with a 25A one, 3 times, and it held for about 3 minutes with the heated seats turned on, then, the 3rd time I replaced the blown 25A fuses, the moment I put another fuse in, it popped right away in my hands while putting it in. So, what'd you suggest me to start with?

Ducati750cc · 25th April 2021, 10:23

You could start by disconnecting all the passenger side seat cables EXCLUDING THE SEAT BELT AND AIR BAG CABLES.

If the fuse doesn't blow it points to the seat being the problem and you would then have to follow the seat heater circuit wiring from the plug to the heater element for a short to ground.

If it still blows with the seat disconnected it then points to a possible wiring fault between the fuse box and seat connector.

Never be tempted to go to a higher fuse than required, at best it may blow, at worst things might start to melt.

On the seat, if you determine the cable connectors to the heater pad 2 ? then using an ohmmeter test across them, it should show some resistance, not too high, the seat pad element, if it shows a closed circuit 0.000, then you have a short circuit.

Rsnail · 25th April 2021, 11:47

But is it also possible that the problem lies in the heater circuit for the driver's side? Or only the passenger side could be the problem since the passenger's side electric seat stops working when the fuse blows?

SD1too · 25th April 2021, 11:49

Quote:

Originally Posted by Rsnail

Hi, just looked at the passenger side fuse box panel, and I am positive, it is fuse n. 25, heated seats fuse ...

Thanks for confirming Gambalosi. RAVE is misleading. Fuse 25 supplies part of the ignition switch dedicated to the heated seats but the full description hasn't been given!

As Ducati750cc says, detach the connector from the seat. You're looking for wiring colours orange/white (supply) and yellow (earth via the heated seat switch).
If, with the wiring socket disconnected from the seat, the fuse still blows, it could be a fault in the heated seat switch (which contains an electronic timer) as this is also supplied by the orange/white wire.

Quote:

Originally Posted by Ducati750cc

Never be tempted to go to a higher fuse than required ...

Simon

SD1too · 25th April 2021, 11:54

Quote:

Originally Posted by Rsnail

But is it also possible that the problem lies in the heater circuit for the driver's side?

Yes; both driver's and passenger side seats are supplied from the same fuse.
But you say that the passenger side seat movement stops working when fuse 25 blows?

Simon

Rsnail · 25th April 2021, 12:50

Precisely. And I am 1000% sure that fuse n. 25 is for heated seats. But it's not unheard of, read on some other topics that this happened for others too.

SD1too · 25th April 2021, 13:30

Quote:

Originally Posted by Rsnail

And I am 1000% sure that fuse n. 25 is for heated seats.

So am I, it supplies only the heating elements according to RAVE. I don't understand why you're losing seat movement.

Simon

Rsnail · 25th April 2021, 16:50

Well, it is what it is... I am not crazy and I can tell you, when that fuse blows up, passenger seat won't move, for the short period of time when the fuse holds up, passenger seat moves normally, but when it blows, I've got no heated seats, and neither passenger side electric seat controls

24th April 2021, 22:18	#1
Rsnail Gets stuck in Rover 75 Saloon Join Date: May 2015 Location: Essen (Oldenburg), Germany Posts: 626 Thanks: 59 Thanked 30 Times in 28 Posts	Heated seats fuse keeps popping Hi, so long story short, after finding the passenger side electric seat not working, I traced the problem to a blown fuse (n. 25 I think it was), changed that, and fee deconds after, it popped again, changed again, same happened, what do you think could most likely cause it and how can it be resolved? I have a european LHD car if that matters.

25th April 2021, 06:47	#2
SD1too Doesn't do things by halves Rover 75 2.5 Connoisseur Auto (1999) Dealer launch model. Join Date: Mar 2007 Location: Former Middlesex Posts: 20,344 Thanks: 1,587 Thanked 3,749 Times in 3,181 Posts	Fuses blow when too much current passes through them due to low resistance in the circuit. This is typically caused by a short circuit to earth. But first you'll have to be more precise about which fuse is affected. On your 2000 car passenger compartment fuse 25 is listed as "ignition switch". Simon __________________ "Whatever is rightly done, however humble, is noble." Sir Henry Royce.

25th April 2021, 10:23	#4
Ducati750cc Loves to post Rover75 tourer Join Date: Jun 2018 Location: Ashton Posts: 428 Thanks: 121 Thanked 206 Times in 145 Posts	You could start by disconnecting all the passenger side seat cables EXCLUDING THE SEAT BELT AND AIR BAG CABLES. If the fuse doesn't blow it points to the seat being the problem and you would then have to follow the seat heater circuit wiring from the plug to the heater element for a short to ground. If it still blows with the seat disconnected it then points to a possible wiring fault between the fuse box and seat connector. Never be tempted to go to a higher fuse than required, at best it may blow, at worst things might start to melt. On the seat, if you determine the cable connectors to the heater pad 2 ? then using an ohmmeter test across them, it should show some resistance, not too high, the seat pad element, if it shows a closed circuit 0.000, then you have a short circuit. __________________ Common sense isn't a gift, it's a punishment because you have to deal with everyone who doesn't have it.

25th April 2021, 09:24	#3
Rsnail Gets stuck in Rover 75 Saloon Join Date: May 2015 Location: Essen (Oldenburg), Germany Posts: 626 Thanks: 59 Thanked 30 Times in 28 Posts	Hi, just looked at the passenger side fuse box panel, and I am positive, it is fuse n. 25, heated seats fuse, it also has a drawing of a seat with 3 curved lines coming out of the seat like that'd be the heat haha. Anyways, I replaced the 20A fuse with a 25A one, 3 times, and it held for about 3 minutes with the heated seats turned on, then, the 3rd time I replaced the blown 25A fuses, the moment I put another fuse in, it popped right away in my hands while putting it in. So, what'd you suggest me to start with?

25th April 2021, 11:47	#5
Rsnail Gets stuck in Rover 75 Saloon Join Date: May 2015 Location: Essen (Oldenburg), Germany Posts: 626 Thanks: 59 Thanked 30 Times in 28 Posts	But is it also possible that the problem lies in the heater circuit for the driver's side? Or only the passenger side could be the problem since the passenger's side electric seat stops working when the fuse blows?

25th April 2021, 12:50	#8
Rsnail Gets stuck in Rover 75 Saloon Join Date: May 2015 Location: Essen (Oldenburg), Germany Posts: 626 Thanks: 59 Thanked 30 Times in 28 Posts	Precisely. And I am 1000% sure that fuse n. 25 is for heated seats. But it's not unheard of, read on some other topics that this happened for others too.

25th April 2021, 16:50	#10
Rsnail Gets stuck in Rover 75 Saloon Join Date: May 2015 Location: Essen (Oldenburg), Germany Posts: 626 Thanks: 59 Thanked 30 Times in 28 Posts	Well, it is what it is... I am not crazy and I can tell you, when that fuse blows up, passenger seat won't move, for the short period of time when the fuse holds up, passenger seat moves normally, but when it blows, I've got no heated seats, and neither passenger side electric seat controls