[928uk] Alarming

[Paul R Smith]

The door lock contacts (the little switch on the end of the lock barrel) 
do have a habit of getting water in them. The symptom I have seen before 
was the water "shorting" across open contacts causing the central 
locking to unlock. What you might have is corrosion preventing a good 
unlock signal to the alarm (and central locking). Certainly worth checking.

The immobilisers fitted to UK cars was done for the importer, so it is 
quite likely that yours will have something different. If I were you I 
would see where that box connects to before deciding what it is. If it 
is a dodgy immobiliser, it is a good idea to get rid of it, but to do 
that you will have to work out the wiring, so you won't wast any time 
checking out the wiring first.

Smiffy

On 05/09/2019 17:25, Michael Parris via 928uk wrote:
> Subject:
> Alarming
> From:
> Michael Parris <michaeljparris at gmail.com>
> Date:
> 05/09/2019, 17:25
> 
> To:
> 928 uk <928uk at lists.928.org.uk>
> 
> 
> It seems I have two discrete issues, one being the re-appearance of a 
> 2017 problem with cold and hot starting, I've done 4K miles fine since 
> then.  I'll deal with that in a different thread.
> 
> This one is about the alarm.  I don't have a fob to press or insert in a 
> plug however on occasion the horn has beeped.  I think that's down to a 
> bad door lock contact because sometimes opening the driver door doesn't 
> open the passenger and when I go to start the alarm sounds.  Could there 
> be an immobiliser on this system too?
> The reason; I'd driven 5 miles left it for 20 minutes and it started 
> normal but died so it needed full throttle to go (typical of not holding 
> idle issue at start), went another couple of miles and left it for 90 
> minutes.  This time the engine just span with no hint of firing.  I 
> cracked a fuel line and it was under pressure but not as much as I would 
> expect or have seen before when I've done that shortly after shutting 
> down.  I did a battery reset, still the same.  Then it occured to me 
> that it was a bit like an immobilised condtion.  I locked and unlocked 
> the car, then it started but need a little throttle until it held its 
> own after 10 seconds or so.
> 
> Behind the fuse board there is a small box with some brown wires that 
> are crimped into the spades for the fuse holders and it has a fly lead 
> with a two pin plug same as the ones to knock sensors.  It doesn't look 
> standard but has been wired in well. Mine is a Japanese car but not sure 
> if that makes any difference.
> 
> I have a spare door contact so I think the next job could be to replace 
> that at least.
> 
> Thoughts?
> 
> Mike
> 90S4

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