2 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHAlarm Problem after changing battery.
Leading reported evidence
Disconnect alarm control module went back
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
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0
Unsuccessful attempts
1
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Performed · outcome unconfirmed · Original poster
When the battery was disconnected the alarm control module went back to the default settings.
Leading evidence: 'Disconnect alarm control module went back' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, the most frequently mentioned possible cause is 'original' (1 discussions; 0 report identifying it and 1 suggest it). The most frequently discussed action is 'Disconnect alarm control module went back' (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 · Original poster
I used the normal procedure of switching the ignition on before disconnecting the battery.
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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Performed · outcome unconfirmed · Original poster
I used the normal procedure of switching the ignition on before disconnecting the battery.
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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Suspected cause · Original poster
These must go bad eventually, and it is probably the original.
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.
2 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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Generation: 20261027T031046Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Anyone else experienced anything like this?
The battery only just started the car last night, so I fitted a new one this morning - Bosch Silver 75Ah. I used the normal procedure of switching the ignition on before disconnecting the battery. When I reconnected it there was a single chirp from the alarm siren about 10 seconds after I connected the negative terminal.
Now, every time I remove the key from the ignition I get a single chirp from the alarm siren after a 10-15 second delay. Then, when I lock the car I get a double-chirp from the siren, but the LED single-flashes every 2 second or so (as it should). There are NO faults shown on a PST2 test.
I have to say this is the first time I have ever heard the alarm siren. On the occasions that I have left the oddments cover open and locked the car, I got a single-beep from the car horn - not this loud chirp from the siren. I have disconnected the battery for about 10 minutes and reconnected it. Still the same, and no faults in the memory.
I KNOW this is going to drive me crazy, so before I disconnect the alarm siren by unplugging it, has anyone else experienced this problem? My initial thought is that something in the alarm control module has been corrupted during the battery change, but could it be something co-incidental? Could it be the backup battery in the siren, maybe? These must go bad eventually, and it is probably the original.
Any thoughts and ideas would be appreciated.
Well, I think I've worked out what's wrong, for those who are interested. (I know, you aren't really[
][
]). When the battery was disconnected the alarm control module went back to the default settings. On UK cars there is an alarm siren and tilt sensor, and the default settings for these devices is "active". I have deactivated these, so now I am back to 'normal' operation. The only snag is that there must be something wrong with either the tilt sensor or siren. Oh, well. Do I worry about it? I was blissfully ignorant about it before[8|]................
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