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Discussion Starter · #1 ·
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..

Any help would be TREMENDOUSLY appreciated!
 

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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.
 

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Discussion Starter · #5 ·
Problem Solved!! The Secret Fuse...!

Hi Chum!

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.

Now...

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.

Let me know how you get on?

All the best!



Ian
 
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