7 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHAlarm keeps going off
Leading reported evidence
Replace alternator failed recently and fried the battery - both
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
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Performed · outcome unconfirmed · Original poster
The alternator failed recently and fried the battery - both have been replaced, but the battery tray seems to have a lot of dried up corrosion residue and I suspect that drain holes may be blocked.
Leading evidence: 'Replace alternator failed recently and fried the battery - both' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Check done' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
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Suggestion
If you get a diagnostic check done, it should show what is causing it.
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
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Suggestion
Check the tilt sensor, which on your car is located next to the battery, under the alarm siren.
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Suggestion
Leave the key in that position while you disconnect the battery, negative terminal first.
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
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Suggestion
Before you disconnect the battery, switch on the ignition (but don't start the car) and turn off all the items you can.
Replace alternator failed recently and fried the battery - both
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Discussions that performed work without a confirmed outcome
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Performed · outcome unconfirmed · Original poster
The alternator failed recently and fried the battery - both have been replaced, but the battery tray seems to have a lot of dried up corrosion residue and I suspect that drain holes may be blocked.
Counts describe captured discussions, not unique people or a diagnosis. Author identities are not reliably stored. Exact duplicate evidence is counted once across matching discussions; one discussion counts at most once per action/state. Multiple repairs reported together remain a combination. Suggestions and failed attempts do not establish a fix. Matches cover whole discussions and can include related faults, model variants and incomplete threads.
7 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Porsche Club GB: 1 discussions
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1 acknowledgements have no verified action link; they do not establish a repair result.
Outcome without a verified action link
This appears to have solved the problem as I've had no more problems with the alarm.
1999 Carrera 4
This weekend the alarm has started going off at seemingly random times after locking the car. Sometimes this is within a minute or so, and other times after maybe an hour or two. I've tried going round checking the closure of all the monitored points (doors, boot, bonnet, oddments tray etc), but can't seem to stop it. At the moment I'm having to leave the car unlocked, which is worrying! Is there anything I can do myself or is this automatically a job for a garage? Is there any way of disabling the alarm, so I can at least lock the car until it's sorted?
Thanks
Ed
Check the tilt sensor, which on your car is located next to the battery, under the alarm siren. They have a nasty habit of filling with water, causing false alarms.
If that isn't it, then the next most likely thing is the interior monitoring sensor. If you get a diagnostic check done, it should show what is causing it.
Edit: You could try unplugging the tilt sensor. Also, if you double-lock the car with the key or remote, it will disable the interior sensor.
Had a look at the tilt sensor, but nothing much to see - the car had dried out pretty well by then. I think this is the most likely solution, however - both the recent episodes of this problem have coincided with wet conditions. The alternator failed recently and fried the battery - both have been replaced, but the battery tray seems to have a lot of dried up corrosion residue and I suspect that drain holes may be blocked. Is there any problem about removing the battery, to get proper access to the tray? I have the code for the radio, but is there any other issue with disconnecting for a while?
Many thanks
Ed
Before you disconnect the battery, switch on the ignition (but don't start the car) and turn off all the items you can. (Aircon, radio, interior lights, etc). Leave the key in that position while you disconnect the battery, negative terminal first. This will stop the alarm siren going off, as it has a backup battery inside.
DON'T lock the front compartment with the battery disconnected. Also, you won't be able to secure the car, as the passenger side won't lock without the central locking system.
Sorry for the delay in posting again.
I removed the battery and then the siren and tilt sensor assembly, and decided that the latter had water in it (it's semi-transparent). However, I couldn't find any way to remove it from the mounting bracket, without damaging it, so I ended up just disconnecting it, as others have - that wasn't easy, as the connector seemed to have 'welded' itself to the socket. This appears to have solved the problem as I've had no more problems with the alarm.
Many thanks for your assistance.
Ed
This is a source reference. Confirm exact model applicability in the original material.
