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24th April 2021, 22:18 | #1 |
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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.
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25th April 2021, 06:47 | #2 |
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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
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25th April 2021, 09:24 | #3 |
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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?
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25th April 2021, 10:23 | #4 |
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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.
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25th April 2021, 11:47 | #5 |
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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?
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25th April 2021, 11:54 | #6 | |
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Quote:
But you say that the passenger side seat movement stops working when fuse 25 blows? Simon
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25th April 2021, 11:49 | #7 | |
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Quote:
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. Simon
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"Whatever is rightly done, however humble, is noble." Sir Henry Royce. Last edited by SD1too; 25th April 2021 at 11:56.. Reason: Spelling |
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26th April 2021, 10:18 | #8 |
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Your issue will be the seat thermostats, Mr Doodles had the same issue on his 190 years ago, changed the seat stat and it’s still doing its job today.
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26th April 2021, 20:31 | #9 |
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OK as promised I had a look today, the car is an 05 connie CDTI tourer, elec and heated seats.
The seat movement supply is live all the time and not ignition controlled, the seat heater supply is ignition controlled. In the glovebox fusebox, fuse 49 is for the heated seats, 51 is marked up as seat memory, fuse 53 is also marked up as seat memory. With fuse 49 removed, the seat heaters don't work but both seats work OK. With 51 removed both seats work when using the handles, I didn't try the memory function. With fuse 53 removed the seats didn't work Fuses 51 & 53 removed singly or both at once the heaters work OK, so there appears to be no connection on this car between the seat movement and heater circuits.
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26th April 2021, 21:58 | #10 |
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So we definitely have different fuse panels in the cars, my fuse numbers don't even go up to 50 haha, I think the biggest number is about 30-35 at max. And I know for a fact there are atleast 2 different types of fuse panels for our cars, so maybe that could change these variables too, I don't know if it has to do with built year or if it's an LHD or RHD vehicle. But anyways, this coming weekend I'll start investigating and will let everyone know what I find. In the meantime, would it also be necessary to remove the seat base leather cover? If so, can anyone give me some tips and maybe even photos that would help? Thanks a lot! I just want to be prepared before doing this and saving some head scratches haha
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