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YOUR RESEARCHPreserving codes, etc., while changing batteries
Leading reported evidence
Disconnect battery...the water temp
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That's all I lost when I disconnected the battery...the water temp.
Leading evidence: 'Disconnect battery...the water temp' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Check (in ca)' (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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Replace battery in my '04, everyting worked immediately except
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When I recently replaced the battery in my '04, everyting worked immediately except for the radio stations I had previously programmed to the buttons.
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Suggestion
You also lose the engine monitors needed to pass a smog check (in CA).
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Suggestion · Original poster
Is there any (SAFE) way to preserve the codes (ECU, radio, etc) which changing batteries?
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Suggestion
how do you change the battery without the trunk open?
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Suggestion
I began immediately to reset the stations and by the time I was finished with the 4th button, I noticed that buttons 5 - 8 were back to the original programming.
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SORRY if this is repeat, but I spent a lot of time paging thru battery threads tonight, and did not see anything.
Is there any (SAFE) way to preserve the codes (ECU, radio, etc) which changing batteries? Would the battery maintainer that works thru the lighter keep the codes in order?
What codes do you need? You have an '03 so the DME saves the radio code. There is no ECU code to save so to speak. You may reset the ECU, but it will quickly learn your driving style again...
What if the question pertains to '99 - '01 cars? I was thinking the same thing myself recently.
Excellence had an excellent article recently on how to tell if your alternator and battery is healthy using the volt meter. I remember as far as the volt meter should go up to 14 volts after start up showing the alternator is healthy.
There is also another section on turning on the lights without starting the car and seeing how far the voltage goes down and what deems it a battery in weak or healthy condition.
When I recently replaced the battery in my '04, everyting worked immediately except for the radio stations I had previously programmed to the buttons.
However, give the radio some time, 5 minutes or so, to reload stations you have previously stored in the system. I began immediately to reset the stations and by the time I was finished with the 4th button, I noticed that buttons 5 - 8 were back to the original programming.
You also lose the engine monitors needed to pass a smog check (in CA). If your battery dies or is disconnected, you need to drive the car until it is damned well good and ready to let you pass smog. No one seems to be able to determine exactly how much driving of what kind is needed, either.
