![]() In turn, the quickest way to spot iDrive is to look for the fancy LCD control display screen up on the instrument panel. Typically, the easiest way to identify a vehicle equipped with MOST Bus is to look for iDrive. ![]() Don’t gamble always register a new battery on any BMW equipped with MOST Bus-a single-line, fiber-optic ring network BMW introduced in the early 2000s. On a late-model BMW, skipping battery registration can be one of them. Third, several problems can cause premature battery failure. To say the least, premature battery failure can be aggravating for the customer and embarrassing for you and your shop. For instance, he’s diagnosed cars on which a new battery didn’t even last a year because it wasn’t registered! The charging system could shorten the life of an unregistered battery by charging it too aggressively when it’s cold it also could shorten the life of an unregistered AGM battery by overcharging it, he said. However, a savvy BMW specialist warned me that skipping the battery registration process can dramatically shorten the life of a battery in these vehicles, be it an AGM or a conventional battery. Ignoring the registration process after replacing a battery won’t trigger a DTC or turn on the MIL. You don’t absolutely have to register every new battery you install in these late-model BMWs. Second, the process of updating this alternator-control computer is called battery registration. What’s more, this computer needs to know if you’ve updated a vehicle from a conventional battery to an AGM type it charges the AGM differently than a traditional battery. Whenever you replace a battery, this computer really needs to know because it doesn’t charge a fresh battery the same way it charges an older battery. There’s a computer, which goes by several different names, that controls the alternator. First, the electrical system is so sophisticated that it tailors charging as closely as possible to both the type and the age of the battery. Okay, let’s get back to those late-model BMW charging systems. Finally, fully recharging an AGM battery safely and quickly requires an AGM-capable charger. Some higher-end European vehicles have an AGM battery somewhere inside the vehicle powering on-board electronics while a separate battery under the hood handles starting duties. These features make them especially well-suited for locations inside the vehicle. Also, AGMs are designed to be very low-gassing batteries. An AGM battery is more damp than wet inside because it isn’t flooded with liquid electrolyte like a traditional battery is. You read correctly-relearning the charging system!įirst I’ll recap the AGM battery information. ![]() This time I’ll focus on another one, relearning BMW charging systems after battery replacement. Last month I discussed a timely trend in higher-end European electrical systems, the absorbed glass-mat (AGM) battery. Many late-model BMWs also need to know when you replaced it. It’s no longer enough to replace a battery when necessary. Vehicles are becoming increasingly self-aware with each passing year. ![]()
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