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Blowing 25amp fuse when adjusting seat

Posted: Mon Jul 04, 2022 12:43 pm
by supersonic62
Hi folks, have an issue with moving the back of the seat via either switch on bottom right hand side of drivers seat or first switch of the four situated along trans tunnel, it blows the 25amp fuse ( 1989 3.6 model ). I don`t have to move it but when it goes for it`s Mot they move the seat and it blows the fuse. Mot was done in Nov 2021 and I haven`t driven it until today and Circuit 2 Failure was showing on the Fault system.It happened when mot was carried out the year before also.I replaced the fuse today and when pressed first button of the four it blew straight away, but doesn`t do it if the other three buttons are pressed. Could it be that the person is too heavy for motor to move position of seat ? when replaced fuse again the warning on the fault system goes off. I`m sure one of you knowledgeable folks will have the answer, regards Paul

Re: Blowing 25amp fuse when adjusting seat

Posted: Wed Jul 06, 2022 2:33 pm
by Doherto
Paul, I am no expert but I did remove and reinstall a pair of these seats into my Mk2. I assume the fuse blows without anyone sat on the seat as well as with. ??? If both switches are blowing the fuse that effectively eliminates them from going high resistance and drawing too much current. I THINK that there are separate motors for each movement and so either the motor is drawing too much current and blowing the fuse OR it cannot drive and then exceeds the 25Amps. If I had the problem I would, assuming it blows without someone on the seat, remove the seat, two bolts at the front and two at the back, all Torx heads, to check that a stone or something carried into the cabin on your shoes has not become trapped in the rails and preventing movement mechanically. Failing that I would remove the motor for inspection and testing. I do not know but suspect that the motors may be interchangeable, not easy, but that would be one way to prove if the motor is faulty or not. My money is an a mechanical obstruction / lubrication. Keep us updated. Tony D

Re: Blowing 25amp fuse when adjusting seat

Posted: Wed Jul 06, 2022 2:40 pm
by Doherto
Paul, I read and re read you post and then replied. I then re read it again and now understand that the movement that is not working is the upright back movement so my reply is useless as i thought it was forward and back movement. Sorry. Some of it applies though, take the seat out, isolate the motor and test it, apply 12v directly to it to see if it moves. I have a circuit diagram which may give you some support if you need one. Tony D

Re: Blowing 25amp fuse when adjusting seat

Posted: Thu Jul 07, 2022 8:11 am
by supersonic62
Hi Tony, since asking the question regarding movement ,I came across why there is a switch on bottom right of drivers seat ( actually on youtube) it said it was to allow the driver to exit the vehicle. I knew it didn`t move it forward, but it actually moves the seat back not the upright of the seat. As being six feet tall the seat is always as far back as will go, so I got that bit wrong as never use it only when mot guys have moved seat forward in order to put it all the way back to how I have it. But it did blow the fuse again as I said it did when using the first button( of the four) to tilt seat forward or back. So I will investigate this today, so Tony your advice wasn`t useless as the fuse will blow when using the button on seat plus when using first button of four adjusting back rest . I hope it is something as simple as a stone or the like as don`t fancy taken seat out as had to do that to daughters car only last week and they use locktite or similiar and it was a devil to get the bolts moving.
Thanks Tony for your advice much appreciated. And just a question to anyone really ,on entering and to exit the car you have to slide under the steering wheel and same to clamber out, I know steering adjusts but room isn`t generous. I have a series 2 and it has ample room .I have only had the car twelve years lol but it does seem like you almost have to fold yourself up to get in the drivers seat

Re: Blowing 25amp fuse when adjusting seat

Posted: Sun Jul 10, 2022 10:13 am
by supersonic62
Hi folks, just an update really , I looked under drivers seat ( admittedly the first time apart from hoovering, and you don`t really look right underneath) and found a philips head bolt approx 2" ( in old money) touching the left runner and the framework of the seat. I couldn`t see from where it came without removing the seat and if could be avoided that would be best I thought. Anyway I operated all drivers seat switches including the one on the seat itself , with occupant and without a total of four times and no blown fuse occured and seat moved as smooth as it had always done, and nothing appears loose so wondered if this bolt may have been causing a short when switch`s activated.So have put bolt in centre armrest for future as further down the line we may find out where it belongs! So that saved all that malarkey of removing the seat, again thanks to Tony for the rundown of removing seat and wiring info if required. So everything is sweet once again apart from shell E5 at £2.10 a litre in this neck of the woods and just the start of the front edge of the bonnet starting to go a little bit bubbly ( as we know is common on these). It still makes me smile when I take it out and I always look back when I park it up and think yep after twelve years of ownership I made the right choice, magic regards Paul.