Starting about three months ago, my '05 HSE with 56,000 miles began some erratic behavior on start up. At first, the NAV system would shut down when the key was turned to the start position. Not long after, the NAV system would reset to default settings after start up, and now I get an occasional "HDC System not available" warning on start up. These errors are most likely (only???) to occur when the vehicle is started the first time after sitting for a day or two or more.
My first thought is the battery is getting old and when the key is turned the voltage drops below some threshold level that results in the NAV system shutting down and the HDC system not having enough voltage to perform its self check. The battery indicator light is a sold green and the engine turns over and starts promptly. It's a minor annoyance resetting the NAV system each time but it's not worth the cost of a new battery. I saw in another post that someone had similar problems when they took their vehicle into really cold weather.
My questions: Is an aging battery the likely cause of the NAV and HDC faults? How long have LR3 batteries been lasting? I'm going on 40 months on the original. If the battery is the problem, how long do I have before I'll need a jump?
My first thought is the battery is getting old and when the key is turned the voltage drops below some threshold level that results in the NAV system shutting down and the HDC system not having enough voltage to perform its self check. The battery indicator light is a sold green and the engine turns over and starts promptly. It's a minor annoyance resetting the NAV system each time but it's not worth the cost of a new battery. I saw in another post that someone had similar problems when they took their vehicle into really cold weather.
My questions: Is an aging battery the likely cause of the NAV and HDC faults? How long have LR3 batteries been lasting? I'm going on 40 months on the original. If the battery is the problem, how long do I have before I'll need a jump?