When I open or lock my doors almost every time the fuse will blow. While the car was at the dealers the other day they said it was the lock assy. Who am I to argue. They quoted me $850 plus fitting. But I wasn't drunk enough to agree. So I bought one from Auss ebay for $150 and it arrived today. Is it possible that the lock could cause the fuse to blow though? I read loads of posts about these locks but none mentioned blowing fuses. I looked for a short for a few hours and gave up. I'm attacking this job on Sunday.
If the lock assy is stuck, it's possible that the system draws too much current trying to operate it. I had to recently replace the passenger side assy and I remember that the system cycles itself a few times (lock and unlock) trying to rectify itself. Eventually, the fuse did blow.
I would have started by swapping over the lock relay and window/lock ecu and testing them first. These are where the power is drawn from. If the relay contacts are worn and pitted and lock open or closed (or flap) they can cause all kinds of problems, not to mention spikes and battery issues too. If they have eliminated them from the equation (by using a donor cars lock ecu/lock relay) and its still blowing then its likely to be the door lock. Ironically these are from an old fiat/lancia (!), I once looked them up and they where ridiculously low price (sub $50) new...
Thanks Trev All I can do is go by what they told me. I would be well hacked off if they fitted a new $850 lock and the fuse blew again! But they reckon that's the fault. Is it poss for you let me know where the window lock ECU is? or the relays? If it still blows I will check it. Thanks again
I recall they where left and right handed. Did they say which side it was? I actually was planning to make my own door lock/window ecu so traced the entire thing once inside the ecu and even began to design a replacement, I'll have to see where I put that... Here's a few pics.. Worth d/l-ing the workshop manuals if you plan to trace this further. Image Unavailable, Please Login Image Unavailable, Please Login
I found that the workshop manuals (at least the versions that I have) contain significant errors in the wiring diagrams. Wasted hours of time...I can point out a few of the errors, if anyone is interested. The PDF file called "Wiring Diagrams 360 spider" has many of the errors/omissions corrected. My hunch is that the diagram in Post #5 was derived from this source.
Thanks for this info Steve. So I started pulling the door apart today and had a look. When I pulled the leather cover off to reveal the bits I noticed the threaded joiner was floating. Ferrari (Yes, Ferrari) left it just lying around. Unbelievable. They also left a nice scratch for me on my carbon fiber. Too bad if they read this site. So I thought, YES, found it, so I reconnected it but there was nothing happening from the lock. No sound or anything. The fuse wasn't blown because the other side was working. I began to consider taking the lock mech out (Ferrari assured me it was this) but thought I'd check first with you guys first that the lock is still the likely cause? Plus it looks like a real b***h of a job! Those cables look awkward to get on and off. The door will lock and unlock with the key luckily. Hasn't been a great day really. Image Unavailable, Please Login
Graham, This threaded union is the culprit in my experience when you go to lock the car and you get two clicks, it moves to look then unlocks all by itself. Basically if it gets too much tension on it the lock assembly can't lock. That's probably why they unscrewed it. If you haven't yet.. I'd open the door panel. It could be a short in the line from the window moving up and down (check by mirror top part of door), a cable that's too tight, or the lock itself. It's a punto lock assembly IIRC that can be had pretty cheap on fleabay.
Ferrari did that. I called them today and they assured me the lock is seized up and needs to be replaced. I'm reading every thread I can before I attempt to swap it over. Cheers
I'll bet hardest part is playing with the cables. When you get the new lock you can plug it into the harness before installation, clear all the loose cables etc and close the door with the window down and then lock it. If the fuse doesn't blow then finish installation. (Of course at that point its going to be installed anyway I guess )
So today I installed the new high quality from Lancia/fiat door lock unit. Same damn result sadly. It won't be another faulty lock. My problem is that Ferrari tell me to replace things because they don't them in stock. So I bought another lock for $150 and it's the same result. I wonder if they would have still charged me $850 plus fitting if they had the same result! I will have to look further now, and I found the relay to check. Before I do this there is only one relay for both sides. So if it were faulty neither for would open would it? So I am now assuming it's something else. Any advise before I start buying more stuff I don't need! It's amazing that I have had this service on what is supposedly a Ferrari trained garage.
Of course they would! On a good note, you have one thing you can now rule out! And it should be good for quite some time. I was hoping it would have fixed it. It's shorting somewhere... My next step would be to check the relay and then pull the connectors at the door hinge apart and check continuity/ resistance at the connector with the hypothesis that a line is shorting in the door somewhere or in the chassis. I might see if I can do this on mine today to get a "standard".
I am no longer surprised at what happens with Ferrari Service, but I would have been surprised if the new lock had fixed the problem. Go back one connector from each micro switch, and run a short circuit test (SCT). Let me know if you need help with the pinout. BTW, there's a trick to this: When you run the SCT, you have to induce the short; PM me if you want more.
Thanks for the input you guys I taking the dogs for a walk and then will get into this thing and get to the bottom of it. I will do the SCT and see what happens. Can't be to much when you think about it. Hopefully later today I can let you know it's sorted!
