The car was in storage over the winter when daughter was in college. I jump started the battery and for a breif moment the cables were wrong. Everything else in the car works fine except the radio. Is their a fuse or a fusable link I need to replace or did I destroy the radio? What is my next step?
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check your radio fuses-one under hood and another under dashboard.usually after power cut you have to re-enter radio security code to get it going again most car scanners can retrieve it if you don't have on.
start by having the battery tested, if it checks out then charge it on a trickle charger re install and try again. if nothing happens check all connections, you can try jumping power straight to the solenoid to see if the ignition switch or solenoid is the issue
cheapest thing to start with is to buy a new battery. they arent built to last. if that doesnt help then its your alternator. sounds like its gonna be the alternator though. you can test it with a test light though or some alternator repair shops will look at it for free. it will only take them a minute to do if you feel like taking the alternator in
From what you're saying here, I believe that you simply have a bad battery. Most batteries only last 5 years, much less if they're left to sit in storage periodically. You really should charge the battery overnight and do a load test on it the next day. The person(s) you spoke to at BMW were probably sales staff and not actual technicians. Costco has very good batteries at reasonable prices.
There are many reasons for a vehicle not starting and isolating the problem with no specifics if very difficult. Here is some advice however. If you can disconnect the Negative Battery terminal and jump the vehicle and then disconnect the vehicle that provided power then you have a bad battery as a general rule. If after the vehicle is running you disconnect the vehicle which provided power and your vehicle dies then the most likely problem is the Alternator. If you jump the vehicle and go to Auto Zone, they will help you remove the battery and test it for you for free.
Opposed to a blown fuse, most likely the drained/dead battery caused the radio to "reset" itself. You should have a 5 digit (or 4) code that was provided by the dealer or owner. Most owners write it down somewhere on their owners manual. If not, the dealer can give you the code. Once the code is entered, you back in business!
ESP is the Electronic Stability Programme - it only comes on if the engine computer needs to make adjustments for poor driving or road surface conditions. If it is on all the time (and you are not driving down a country road) then you should get it checked out.
P.S. Sometimes low tire inflation will cause the problem. Winter tires depending on the tread will also cause this error.
Take to a local parts store and have the engine code read. Could be a multitude or combination of different problems.