2009 XF 4.2 Luxury replaced battery car k turned car off horn blowing. Started car back up and turned off horn still blowing. Finally got car to turn off with out horn blowing and armed car and went into house. Alarm starts sounding @ 2 am din't know it was my car so thought no more about it. Woke up next day rear brake lights on, key fob not working so used the key to get into car. Everything blank Instrument cluster, Radio screen, and no power to push to start button. Alarm went off when I opened door no head lights no communication only things that work are the horn, map lights, and the seats every thing else is dead. Tested battery with the cables on battery bad test with cables off and the battery is good. Tested fuses on Bcm, and foot well fuse box, and engine compartment fuse box no fuses blown. Can't test with OBD because there is no power. Has anyone on the forum had this type of issue before any Insight would be greatly appreciated. Thanks A

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Yes. Had water in area under driver's side carpet, from sunroof drains, causing Bluetooth module shorting, and screen would restart throughout. There was also an issue with OBD2 user with scanner keeping car on once used killing battery. They fixed that with software update,..

 

Thanks for your reply I had water ingress on the passenger side of the car. Pulled up carpets and dried out not sure we’re the water was coming from. Checked fuse box and had some corrosion on connections of the fuse box cleaned them up and reinstalled. Still no power to cluster, radio, sunroof, windows, and doors. Only power is to seats, map light, and horn so that’s what I’m wondering what would cause them all to go @ one time. Thanks A

 

So no one on the forum has ever heard or seen a problem like this on any other Jaguar or XF?