I just installed this in my car last weekend. 100% agree most of the time is spent dealing with the battery - my positive connector took 3 people to get off because of the awkward angle and being (as I discovered during the install) an 8 year old battery that was beginning to leak, fusing itself with everything it touched. I replaced it during the upgrade and cleaned up accordingly.
My steering controls didn't work until I set bluetooth to use the grom for calls and media, not just media. I also have the factory bluetooth - your grom unit doesn't snag the phone calls from the factory unit? Mine seems keen on it, but I haven't installed the mic because I've no idea yet how I'd get it from the trunk into the cabin without pulling out the entire center console.
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