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Board: Porsche - 911 - 996
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Nov 23, 2011 4:15:13 PM
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Carrageous
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- Loc: Austin, TX , United States
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- Reply to: RZimm996
Re: Replacing - battery in '01 996 C4
Read the manual first. I don't have mine with me, but in the 997, there's a section explaining that you need to get it done at the dealer so they can reset the ECU.
Wish I had more for you! Good luck. And welcome to Rennteam.
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Nov 23, 2011 8:33:32 PM
- RZimm996
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- Loc: Virginia, USA
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- Reply to: Carrageous
Re: Replacing - battery in '01 996 C4
I don't have the proper manual. (I bought the car pre-owned and the dealer found a manual from a different 996 / year. I'll look at the one in the car, but I remain concerned.) On some older threads they talked about different components which may need the battery to be disconnected and remain disconnected, but this was for a newer 996 I believe. There's also the radio codes. I bought a new battery at a auto parts place and also bought a code retainer gismo which you stick in the lighter. I'm anxious to get the replacement battery in, but I'm scared to proceed. Maybe I should just call the local Porsche dealer and talk to someone in service, - if they will talk to me.
Just found the thread (from another site) : Not entirely right
. Yes, in order to reset the ECU/DME you need disconnect the battery and leave it disconnected for some time. This has nothing to do with the radio. The codes for the stereo are stored in the DME and as long as you are using the same stereo that came with the car, you will not have to enter any codes. There are no codes for the ECU...again as long as it is the same DME that came with the car. If you change ECU, you will have to use a PST2 or PIWIS to reprogram it to mate with the car.
Re: Replacing - battery in '01 996 C4
Okay, just read the manual in the car, (I suspect it's from an '02, mine is '01 so probably no change). It says very little, . . . remove negative terminal first - etc. nothing about maintaining codes, nothing about ECU or DME's whatever they are. The plug-in device (into the lighter socket w/ 9V battery) says it will store radio anti-theft codes while the battery is disconnected.
Re: Replacing - battery in '01 996 C4
RZimm996:Just found the thread (from another site) : Not entirely right
Careful! IIRC, you need a radio code to reactivate the radio/PCM after disconnecting the battery on 996s not fitted with a MOST-Bus media circuit.
The situation you describe above, where PCM and DME are "paired" and no code is required, applies to 996s fitted with the MOST-Bus. I don't remember offhand for which MY the MOST-Bus was introduced, but think it must have been around 2001.
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fritz
Re: Replacing - battery in '01 996 C4
The easy way - prior to disconnecting the battery, attach a battery maintainer to the cigarette lighter plug. Problem solved.
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"Dream as impractical, irrational and unnecessary as that may be... Here's to the Dreamers!" -- Porsche AG.
Re: Replacing - battery in '01 996 C4
RZimm996:
Thanks ADias,
Along with the battery I bought a $5 code maintaining device, takes a 9 volt battery, but that may only hold radio codes, I don't know. Are you talking about some other device and if so is this a porsche dealership item or what?
Maybe the 9v battery is enough but I prefer a regular maintainer like a CTek:
and the cigarette adapter:
http://www.amazon.com/CTEK-56-263-Comfort-Connect-Plug/dp/B0016LA5O8/ref=pd_bxgy_auto_text_b
Note: The CTek Maintainer is the OEM Porsche sells with their name on it (at double the price).
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_________________________________________________________________
"Dream as impractical, irrational and unnecessary as that may be... Here's to the Dreamers!" -- Porsche AG.
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