5-Series (E12,E28, E34, E39, E60)Chat relating to the BMW 5-Series of all generations. Specific models include: BMW 518, BMW 520, BMW 520i, BMW 530i, BMW 528i, BMW 530i, BMW 518i, BMW 524d, BMW 525i, BMW 525e, BMW 528e, BMW 540i, BMW 535i, BMW 520d, BMW 525td, BMW 525d, BMW 530d, BMW 525i/xi, BMW 530i/xi. (BMW 5-Series Forum)
The factory alarm in my 1994 E34 530i no longer works, and appears to have taken out the OBC with it.
At first, I thought it was the OBC, and picked one up on ebay and swapped it out, but I still have the same problem.
The door lock works fine. The double-lock works (I can hear the locks sliding) but the alarm does not come on. The dash blinker LED comes on VERY faintly. The OBC does NOT work at all. I read somewhere that a faulty alarm module can cause this (pin 17 on the OBC).
So, my question is:- Where is the alarm module? What should I replace?
Someone near me is breaking a 530i so I can probably get the part cheap..
I have the same problem with a 95 540i; no alarm, no functioning OBC and the FOBs do not work (new batteries in both). OBC does have backlighting, and bulbs have been replaced. I do not have any light with the alarm. All CB's check out 4.0.
I actually found the solution to this ages ago and neglected to post it here (I posted it elsewhere).
Anyway, you need to change 'the Secret Fuse'...! This is a cunningly-hidden fuse since it is for the OBC and factory alarm system.
Here's how you find it:-
Remove the BACK SEAT by lifting it from the front sharply so it pops out.
The rear seat base is held in by two big metal spring clips, each of which enter into two retaining slots - the secret fuse can be seen by looking into the slot on the left-hand side of the vehicle. So if your cars is LHD, look into the slot behind the driver seat, otherwise, it's the passenger seat.
You will need some long-nose pliers to get it out. It's a 15A fuse if memory serves me correctly.
I'm quite confident you will find this fuse to have blown, and a quick change will have everything working again.
The AutoGuide.com network consists of the largest network of enthusiast-owned enthusiast-operated automotive communities.
AutoGuide.com provides the latest car reviews, auto show coverage, new car prices, and automotive news. The AutoGuide network operates more than 100 automotive forums where our users consult peers for shopping information and advice, and share opinions as a community.