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YOUR RESEARCHBoxster - Help - Before disconnecting battery...? - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Leading reported evidence
Install some cheap-o, undersized interstate unit
Performed · outcome unconfirmed
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0
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0
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Performed · outcome unconfirmed · Original poster
On seeing the battery I found that the previous owner had installed some cheap-o, undersized Interstate unit.
Boxster - Help - Before disconnecting battery...? - 986 Forum - The Community for Porsche Boxster & Cayman Owners
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Leading evidence: 'Install some cheap-o, undersized interstate unit' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Disconnect battery i did not need' (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
After disconnecting the battery I did NOT need to enter a radio code.
Boxster - Help - Before disconnecting battery...? - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Disconnect battery will require re-coding the radio
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Suggestion
Disconnecting the battery will require re-coding the radio.
Boxster - Help - Before disconnecting battery...? - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Disconnect battery, i figure i'll do a battery replacement concurrently
Suggestion or failed attempt
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Suggestion · Original poster
Since doing the job requires disconnecting the battery, I figure I'll do a battery replacement concurrently.
Boxster - Help - Before disconnecting battery...? - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Reconnect battery
Suggestion or failed attempt
No successful repair reported for this finding.
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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 · Original poster
The alarm did not sound when reconnecting the battery.
Boxster - Help - Before disconnecting battery...? - 986 Forum - The Community for Porsche Boxster & Cayman Owners
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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.
12 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
986Forum: 1 discussions
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Generation: 20261026T094842Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
I plan to do the OBC hack on my '03 986. Since doing the job requires disconnecting the battery, I figure I'll do a battery replacement concurrently.
Question: What do I need to look out for before/after doing a battery disconnect?
The manual makes all kinds of references to window positions, memory, etc. Is this real or just takes care of itself?
Radio: My '03 was purchased used, and I see no radio card anywhere. The manual, and the radio manual, make no reference to a radio card or code. Maybe the radio in '03 doesn't have a code? The manual only refers to a transponder in the radio that is matched to the car.
Anything else I should know before/after?
Cheers,
Ron
You can buy a little electrical socket doodad at an auto store for about $6. One end plugs into your cigarette lighter and the other end has terminals for a 9 volt battery. You just snap in a 9 volt alkaline battery, plug the socket into your cigarette lighter and then remove your battery. The 9 volt battery provides enough power to the car's electrical system so you don't have to reset your clock or reset the code on your radio.
maybe, maybe not... depends on maintainer. The majority of off the shelf maintainers do NOT include this function...
For clarification (not knowing what MY you have), any Porsche from '03+ does not have or need a radio code punched in after power disconnect. They are all MOST fiber optic connected and electronically shake hands w/ the other components in the system to create a fiber optic loop. If any/all don't work after disconnect, you'll need to see a dealer or indy w/ the PSTII or PIWIS system to get them communicating w/ each other again (rarely does this happen though).
I have a 2003 986, and the manual for the radio (and the other for the car) make no mention of a code at all. Are you sure all 2003+ have MOST? How would I know?
Thanks!
Yes 1,000% sure. All Porsche from 2003 and beyond use the MOST fiber optic loop w the OEM sound system set ups. No codes required as all is done electronically thru "handshakes" between various components authorized/approved on the system/in the loop thru PSTII or PIWIS.
Follow up to this...
1. After disconnecting the battery I did NOT need to enter a radio code. (Thanks BurgBoxster)
2. The alarm did not sound when reconnecting the battery.
3. On seeing the battery I found that the previous owner had installed some cheap-o, undersized Interstate unit. FAIL. That came RIGHT out and I replaced it with a proper Bosch full sized unit ($155). Anything but a Bosch (or better) in that battery tray just looks wrong.
As for the OBC hack, I highly recommend it, but wouldn't bother with installing a new stalk, using a new button on the dash works just fine.
I read somewhere that the whole turning the key and alarm situation applies only to ROW models that have an extra battery and or alarm siren to go off if power is removed without doing the ignition thing. Where ever I read that said US models do not have these parts and the procedure is thus not necessary. Just my 2 cents, cause if what i Read is true, you are both right, just have different models.
