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26th January 2024, 18:29 | #1 |
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Electric seat fuse keeps blowing
Hello guys, I got a 75 LHD European, the one fuse that's responsible for both the passenger side electric seat and seat heating (can't remember the number) keeps blowing each time I change it, doesn't happen instantly when I replace the fuse and while switching the heated seat on or moving the seat, it's just like one day it works and the next day it's randomly blown without any obvious reason. Does it probably have to do with the fact that the carpet was drowned in water for some days because of a leaking seal some months ago? Btw now everything is 100% dry as the leak was fixed and everything was thorougly dried out. Any ideas? Thank you!
Last edited by Rsnail; 26th January 2024 at 18:42.. |
26th January 2024, 18:42 | #2 | ||
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Quote:
Quote:
There's obviously still a short circuit somewhere. Simon
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26th January 2024, 18:48 | #3 |
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So how would you suggest to proceed with the "investigation"? Remove the seat, and then what would you look for?
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26th January 2024, 19:11 | #4 |
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Hello Galambosi,
Don't remove the seat at his early stage. On the wiring diagram a relay is shown for the passenger seat adjustment. I think that you're going to find that under the seat. I'd suggest removing it to disable seat movement. Next continue to use the seat heater and see if the fuse still blows. The idea is to try to isolate the fault to one or the other. Simon
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"Whatever is rightly done, however humble, is noble." Sir Henry Royce. Last edited by SD1too; 26th January 2024 at 19:17.. |
26th January 2024, 22:51 | #5 |
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I see, makes sense! Do you know approximately how that relay looks like? Or maybe the color or other details that could help me identify if? Anyway I'll eventually get to it and see what it's all about. I also suspect the actual seat heating element, probably old or way past it's prime time, but didn't hear of them causing so much electrical discharge that it would make a fuse blow. But then my reasoning: as it's almost older than me lol and doesn't resist electrical current as good as it once did, maybe it lets too much through (and not resisting it as it should to articulate it in a more traditionally fashioned way), and because of that (maybe) the fuse keeps blowing, but then I cannot understand why it doesn't blow meanwhile I move the seat or when the heating element is on... but rather randomly after when those are not being operated
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27th January 2024, 14:02 | #6 |
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Update: today went in and replaced the fuse, blew right away when turned the key ignition on, 3 times replaced and happened like that all the times. Then I located the relay, it's a yellow one, unplugged it, replaced the fuse again with the relay unplugged, and it got knocked out regardless... I'm left clueless now. Do you think that since I unplugged the relay, is it more possible than not that the electric seat is not a problem but something else?
This is the relay I unplugged: Last edited by Rsnail; 27th January 2024 at 14:05.. |
27th January 2024, 20:57 | #7 |
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Thanks for the test results Galambosi.
We can at least rule out all the wiring for your passenger seat movement after the relay. That includes the switch unit and the fore/aft and recline motors. The next step is to separate a wiring connector which supplies the passenger seat heating element. This is C0255 (male) and C0751 (female). Both of these are black, rectangular and have six pins two of which have wires coloured yellow and orange/white. RAVE says that it's mounted under the front passenger seat. Can you see if you can find this please? My wiring diagram is for RHD vehicles so your car might differ slightly. If you can separate the two halves of this connector then try switching on the ignition again, does fuse 25 still blow? Simon
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28th January 2024, 16:12 | #8 |
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When my front passenger foot well flooded (right hand drive UK car) I removed the front passenger seat and several trim panels so I could raise the carpet and insert old towels to remove the bulk of the water then kept the carpet raised until it was dry. Did you remove a seat or some trim panels when your carpet flooded? If you did I wonder if you damaged some wires when you refitted the seat and trim panels.
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28th January 2024, 16:25 | #9 |
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Thanks Simon will do that asap, hopefully next weekend!
And @Syncromesh, yes! I raised up the carpet, dried it out as much as I could, and left 2 warm air fans blowing straight against the carpet overnight, the thing was dry as bone in morning, checked everywhere, 100% sure. However, when I reinstalled the seat and reconnected all wiring, I remember having had some difficulty, not ruling out that I possibly didn't damage some wiring... will see after testing what Simon noted out. Thank you! |
14th February 2024, 10:58 | #10 |
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Another small issue, so when looking under the seat, I found out that the front located motor has 2 thick wires coming out of each side, and the wires end inside the mechanism which moves the seat on each side. So in order to move them manually, one can twist the wires somehow and move a bit one side and a bit the other and so on. But in order to not to such a pain in the a** of a thing, can't I just supply 12v current from a battery to the motor connector? I suppose it works like with a window motor, current from + to - moves them one direction and from - to + to the other direction. Does somebody know if this might be the case too here? Would be much easier like this. Thank you!
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