Tried searching for this but missed it. Sorry if it's a repeat . . .

Is there a way to keep the radio codes while I put in a new battery? Perhaps using the cigarette lighter battery maintainer would work while the battery was being changed. Any suggestions?

 

What year is your car?

 

thanks--2003 996 C4S

 

I saw a dealer change a battery on a Porsche 996 w/o having to reset anything. They did this by having the engine running while the battery was replaced. They told me that the trick was keeping the rev's up to at least 3K RPM's while the battery was swapped quickly. Obviously this took two guys. The one handling the battery was 'standing' in the trunk and he had the new battery setting in the trunk ready.

 

Thanks much, but I'm not that brave!

 

DO NOT - DO NOT - DO NOT - disconnect the battery with the engine running. It will cause a power surge and could blow expensive electronic components. So I heard..but ya...to each his own.

pair of jumper leads. Connect the jumper leads to the battery terminals you are removing and to a second battery along side the car ( pos to pos and neg to neg).
You can now remove the car battery keeping the jumper leads connected to the car terminals.
It is easier to remove battery clamps (retainers) and loosen terminals before connecting jumper leads.
Be very careful that the jumper leads or terminals do not short to ground or each other, wrapping a piece of rag around them would help solve this.
Re fit the new battery and connect terminals before disconnecting the jumper leads
Job done, no loss of codes or memories.

 

For 2003 you have MOST, PCM2 so you don't need radio codes (they are stored in the DME)...There is nothing you really need to save anything (radio stations, any changes you made to the display). I have removed the battery several times without losing anything of value.

 

Super! Thanks! I do not have the radio or PCM2 codes, or serial numbers, so I would have had to have them pulled to reset.
Jon

 

my dealer is swapping out my battery this week so lets see if they charge for recoding!

 

From what I was told.....

The radio (along with other components) has there own aux power sources that take a little bit of time to go dead. I haven't tried it but do you really just instantly lose the battery code once you disconnect the battery? I would assume if you replaced the battery within like 10 minutes it should be fine.

IF NOT
just call your dealer on the phone and talk to the service person. Tell them the info on your radio (serial # + model #s or whatever) which can be access right from the radio by holding down a button. Then tell them those numbers, they will call you back in about 10 minutes with the code. At least thats how easy it was for me.

Also I believe on beckers website there is a form u fill out and they send you your code..... not as easy as just making a quick phone call

Good Luck

 

Thanks, CarJ...

 

I have an 03 4S and changed my battery a few months ago. I just took the old one out and put the new one in without having to reset anything. Didn't keep power to the system at all; hope this helps?

Rusty

 

Someone told me to plug in the battery maintainer, I've also seen something at walmart that runs on AA batteries and plugs in the cig lighter to keep the stored codes intact.

 

Thanks--nothing beats a reply from someone with the same car! Just for my info, what battery did you go with?

 

So I guess I was right. The radio or accessories hold a little charge in them for a while.

I learned this while talking to a guy from K&N about the proper way to install the intake (not destroy my MAF) He stated to disconnect the battery and leave it off for an hour to let the ecu lose all power and reset itself when power was brought back. This was because if u install the intake and have the additional air going to the MAF without resetting it will think something is wrong and thats where the issue is. Instead now it relearns and thinks the extra air is normal

Just thought I would share