6 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHAlarm (developed a life of its own)
Leading reported evidence
Disconnect orange connector, ie the tilt sensor
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
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.
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
This morning, I disconnected the orange connector, ie the tilt sensor.
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.
Suggestion
Ideally it would be best to get a diagnostic check done to confirm it is the tilt sensor which is setting it off, but it does seem the likely culprit if is filled with water and the connectors are corroded.
Leading evidence: 'Disconnect orange connector, ie the tilt sensor' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, the most frequently mentioned possible cause is 'interior monitoring sensor' (1 discussions; 0 report identifying it and 1 suggest it). 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.
Source reports, not a diagnosis or a success probability. Counts refer to discussions and can overlap.
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.
Discussions that suspect a cause
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.
Suspected cause
If it isn't the tilt sensor causing the false alarms, the next most likely culprit is the interior monitoring sensor.
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.
Discussions that contain suggestions
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.
Suggestion
Ideally it would be best to get a diagnostic check done to confirm it is the tilt sensor which is setting it off, but it does seem the likely culprit if is filled with water and the connectors are corroded.
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.
Discussions that contain suggestions
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.
Suggestion
Ideally it would be best to get a diagnostic check done to confirm it is the tilt sensor which is setting it off, but it does seem the likely culprit if is filled with water and the connectors are corroded.
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.
Discussions that contain suggestions
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.
Suggestion · Original poster
Can I update, or do I simply have to replace like-for-like?
These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.
Check done
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Discussions that contain suggestions
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.
Suggestion
Ideally it would be best to get a diagnostic check done to confirm it is the tilt sensor which is setting it off, but it does seem the likely culprit if is filled with water and the connectors are corroded.
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.
Suggestion
Ideally it would be best to get a diagnostic check done to confirm it is the tilt sensor which is setting it off, but it does seem the likely culprit if is filled with water and the connectors are corroded.
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.
6 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Porsche Club GB: 1 discussions
0 evidence records excluded for query context · 0 excluded by outcome qualification · 0 adjusted by outcome qualification.
0 acknowledgements have no verified action link; they do not establish a repair result.
Generation: 20261026T200546Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
So it's finally happened: the alarm on my 996 TT has started going off all by itself. I recall an item a few years ago saying it's the tilt sensor that lets water in ... I've had a look at it, and indeed, the orange connector's contacts have corroded, so it looks like it's been rather wet. Richard, your excellent Ultimate User's Guide tells me that later cars had the sensor under a seat. Can I update, or do I simply have to replace like-for-like? I've tried to access Alarm Issues on this forum, but for some reason can't.
Many thanks
Ideally it would be best to get a diagnostic check done to confirm it is the tilt sensor which is setting it off, but it does seem the likely culprit if is filled with water and the connectors are corroded. Disconnecting it completely should prove the point. You'll probably get a beep on locking/unlocking, but that's all. If it isn't the tilt sensor causing the false alarms, the next most likely culprit is the interior monitoring sensor.
They don't make the old tilt sensor, so you have to update it with a new sensor under the passenger seat. There is a Technical Bulletin covering this, and I can send you a copy if you PM me your email address.
As ever, the plot thickens. This morning, I disconnected the orange connector, ie the tilt sensor. For a few hours, all was well, and I thought that was it. Then this afternoon there were two alarms - the first one an undulating siren; the other, maybe an hour later, a rapidly-repeating chirp. So now I've disconnected the siren as well and taken the unit out of the car.
For interest's sake, the part numbers are:
Tilt sensor: 996.618.265.00
Siren & battery unit (Hamilton & Palmer): 996.618.237.01
and the metal bracket has two numbers on it: 996.637.219.01 and 996.637.419.01. It is also marked with the Hamilton & Palmer logo.
I've tried to open up the tilt sensor, but it's very well sealed (it appears glued/bonded); and in any case, I now suspect it's not the culprit. I've opened up the siren & battery unit, and inside there is not only the siren and battery, but also a printed circuit board with two chips and a handful of other components - capacitors, etc, i.e. it looks like this is the full alarm circuitry.
Is it OK to leave it off the car for now? As far as I can tell, the car starts and runs normally without it connected.
Richard, I'll PM you with my email address and take you up on your offer of the tech bulletin.
Yes, it is fine to leave the siren off too. The circuitry is independent of the main alarm module under the passenger seat. You will still have the alarm horn connected (the horn on the other side of the battery) so will still hear a (rather pathetic) beep-beep if it goes off.
The alarms are quite sensitive to battery voltage - is the battery in good shape?
As far as I know, the battery is in good shape. I bought it in 2015 and use a C-Tek trickle charger as a matter of course. (I've checked: the alarm sounds independent of whether the trickle charger is connected or not.)
Incidentally, I've tried disarming the interior sensor by locking the car using a double-plip. The alarm still goes off at random, so I presume it's not the interior sensor.
Your comment about the alarm horn prompts a thought: during all these random alarms, the siren sounds, but the alarm horn doesn't. It does make me wonder if it's the siren & battery unit.
