I went to drive my son to school this morning, and found that the XJ40 wouldn't start - battery was flat. I know why too, as this isn't the first time this has happened.

The kids fidget with the courtesy light switches on the rear of the headrests causing them to stay on after the timer would normally extinguish them. If you drive during the day, you''ll not easily see the lights, and at night you won't notice them unless you wait for everything to extinguish each time you depart the car, which seems an unnecessary hassle - and one sure to bite you the first time you don't follow the routine.

I jumped the car and took my son to school, then when I returned, I popped out the two headrest lamp assemblies. There are three wires. Two to one side of the bulb, which have a sort of white insulator on the connectors, and one uninsulated one behind the switch on the opposite side. I removed the small male spade connector from behind the switch and insulated the wire end with a piece of shrink tubing, then stuffed it all back in place.

I still have time-delayed courtesy lamps, but the lights can no longer be turned on by the passenger.

Problem solved.