The other day the wife discovered that the front passenger electric window would not operate. Perhaps it’s the rocker switch thought I, but then it wouldn’t work from the driver’s side window control panel either. I’ll just check the others I thought. So the passenger side rear window won’t work from the drivers control panel either. Perhaps it’s a fuse or a relay me thinks. So then I try the drivers side rear window from my control panel, and low and behold, both rear windows go down ! Now I am confused. Happily, both the rear windows went up again upon using the rear left window up command from the driver’s panel.
Having returned home I thought I would investigate further. So I turn on the ignition to start the car and the windscreen wipers start operating all by themselves ! Before you ask, no I had not inadvertently switched them on. In fact I had to switch the wipers on, and then off, in order to stop them from working. The window situation was still the same although the driver’s window worked just fine. Additionally, when the front passenger door was opened with the engine running, the warning on the dashboard said that the driver’s door was open.
Being thoroughly confused by this time, and dreading the thought of the cost of having all the electronics checked over at the garage (the CT is due next month), I sought information from the internet ‘oracle’.
Happily, I found a YouTube explanation by a chap familiar with our make and model (Jag X308) who said that if you have a problem with the car, and you can’t see what has dropped off or is broken, then it is the battery. Checking the terminal voltage revealed only 11.6 volts despite the battery having had an overnight trickle charge a couple of days previously. With all this Covid business the car spends days on end without turning a wheel, and the car alarm and clock tend to drain the battery all the time of course, and with only then making short trips to the supermarket (there’s nowhere else to go is there), the 8km journey isn’t enough to put back into the battery what is taken out by starting the car on a cold day, especially when the heated seats are on as well as the headlights in this seasonally dismal weather.
So, I order and fit the biggest battery I can find (100AH) and all the problems with the windows and other electronics immediately go away.
I have to admit that in all my motoring years, which includes nursing along some real old crocks at times, it’s the first time that I have ever been alerted to impending battery failure by weird operating faults with electric windows.
All is just fine now, but I thought I would relate the tale in case anyone else might experience a similar situation.