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Boxster 986 Alarm Fault

paulrabbette

paulrabbette

PCGB Member
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A couple of weeks ago my local mechanic took my Boxster in as the screenwasher had stopped working. He discovered that one of the hoses behind the battery had come adrift and repaired it. Since then, when I lock the car the horn makes a double beep, which is a sign of a fault. I've checked all the usual things in the interior to make sure nothing is left on or open; I've just removed the battery to see if anything has been dislodged during the work, and I can't see anything wrong. Does anybody have any ideas what the fault might be?
 
The alarm siren (and tilt sensor on earlier models) are in that area, so maybe he disturbed the wiring. Or perhaps the screen wash fluid has been leaking on to it. Either way, I would check the connections.
 
Thanks for your help Richard. I'll have a further root around. Is your photo taken with the valance over the bulk head removed? I suspect it's water ingress, hopefully it'll dry out if I can't see anything obvious.
 
The photo is taken from the passenger side. You can see the battery behind it. You just have to take off the plastic panel to the right of the battery (as you look at it from the front) to access them. The siren is the black and red device, and the tilt sensor is the translucent plastic box.
 
Thanks Richard, I've just managed to get back to this problem. I've taken the covers off, removed the battery, and removed the alarm unit. That all looks normal. To be on the safe side I've disconnected the alarm unit and given the terminals a blast of GT85 -but there was no sign of water ingress. Put it back together and still there's a double beep.
There are a number of differences between my car and your photo. There's a lot more stuff in that area of my car- but I can't see the tilt sensor you refer to. Mine is a 2003 Boxster S facelift model. Any ideas where the tilt sensor might be?
Thanks for all your help so far. Paul
 
Dear Richard,
I thought you (and others) may want to know the conclusion this problem. I called a mobile auto electrician, who diagnosed the interior passenger sensor was faulty but didn't know where to find it on this car. A little digging and I found it's within the interior light cluster. I called the good fella's at 9Apart and they sent me a 2nd hand spare. I disconnected the battery, popped the two covers off the interior light cluster to find 2 torx bolts, unbolted it removed the faulty PCB and replaced with the 'new' part and put it back together. It now seems to behave.
Thanks for your help.
Paul

 
Richard_Hamilton said:
The alarm siren (and tilt sensor on earlier models) are in that area, so maybe he disturbed the wiring. Or perhaps the screen wash fluid has been leaking on to it. Either way, I would check the connections.
Click to expand...


Hi Richard - hope you are well! Do you happen to have the wiring diagram for the Tilt Sensor at all as the plug on mine has perished and I'm going to need to get replacement pins and recrimp them by the looks of it? I checked your excellent book and I can't see the colours from the picture on Page 123 unluckily, but from a photo my mechanic sent me it looks like there are two red and two grey / black wires, so I'm guessing one of each goes to pins 1 and 2 and one of each goes to pins 5 and 6
 
paulrabbette said:
Dear Richard,
I thought you (and others) may want to know the conclusion this problem. I called a mobile auto electrician, who diagnosed the interior passenger sensor was faulty but didn't know where to find it on this car. A little digging and I found it's within the interior light cluster. I called the good fella's at 9Apart and they sent me a 2nd hand spare. I disconnected the battery, popped the two covers off the interior light cluster to find 2 torx bolts, unbolted it removed the faulty PCB and replaced with the 'new' part and put it back together. It now seems to behave.
Thanks for your help.
Paul
Click to expand...

This is really interesting - my car was giving the dreaded double beep and I couldn't resolve it but I think the cable to the interior passenger sensor may have been the cause, like you 2 torx bolts, re-fitted it and it's now OK - It also started after the battery was disconnected.


Your mobile auto electrician must have some very good test kit / knowledge to trace the fault to that unit.

I've also found out the alarm does the single beep if something is open (centre storage cubby, bonnet etc.) but the 'Road Runner' style beep beep is 'fault' warning.
 
ALBXTR said:
This is really interesting - my car was giving the dreaded double beep and I couldn't resolve it but I think the cable to the interior passenger sensor may have been the cause, like you 2 torx bolts, re-fitted it and it's now OK - It also started after the battery was disconnected.


Your mobile auto electrician must have some very good test kit / knowledge to trace the fault to that unit.

I've also found out the alarm does the single beep if something is open (centre storage cubby, bonnet etc.) but the 'Road Runner' style beep beep is 'fault' warning.
Click to expand...


That could be the issue I'm having as mine is also doing the double horn beep 30 seconds after the alarm is primed

Is the interior passenger sensor this unit (996 618 210 02)?
 
My 2000 2.7 is in the garage due to wet carpet and it has ruined the alarm unit under passenger side
They have sent it off for repair so don't know if ok or how much yet
It happened to my gen 2 911 last year and ruined my Bose amp under drivers seat both issues due to drain pipes near hood blocked
Very expensive lesson for me if you have a cab get them checked now !
Nick
 
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