Hello all,

First time post on here, so be gentle

I have a 2010 XF Premiun Luxury, and it has started to do strange things. An alarm has just started sounding (not the horn security alarm but a high pitched beeping from under the bonnet) It stopped after a few seconds, but then started again. The unlocking on the key fob would not work, and when I got in with the key, the car was completely dead.- that is there was nothing happening when I pushed the start button down, both with and without my foot on the brake. The high pitched alarm still went on and off. I got out and opened the bonnet and the high pitched alarm stopped and the security alarm sounded. Got back in the car and the electrics were back, but the clock and tripometer had reset. There was a warning to apply both the foot brake and the park brake. Did this, switched off the car and back on again, and everything was back to normal.

This is all a bit worrying, any ideas?

Thanks in advance

 

Always start with the simple (ie. cheapest) fix and work your way up to more expensive and complicated things. First check that the battery terminal connections in the back are tight and clean, no corrosion. I bought a car at a charity auction once that had all kinds of new electrical parts fitted as if they'd been throwing the kitchen sink at it, but turns out all it needed was a new battery cable. The terminal clamps had been thoroughly cleaned by someone before but I cut and peeled back the insulation and found it was green under the insulation for about the first three inches. Made a nice profit on that one. I'm usually not so lucky. Next, test the battery itself. Jaguars are notorious for being extremely sensitive to having any loss of battery capacity whatsoever. They tend to exhibit "random" illogical symptoms as the batteries get old. After you've eliminated the battery and cabling as the source, then post back and someone will suggest the next thing to check.

 

Hey, thank you for your help. Checked the battery and loose connection on the negative terminal It seemed such a strange set of circumstances for it too suddenly happen - the car had been sat at work for at least 4 hours before it happened, but hopefully all sorted now!