This happened back in the beginning of April. I started getting TPMS faults that would come on and then go off. Then the touch screen went black and wouldn't turn on. I figured it had to be the battery and went to a local Sears and had them put a new one in. When I got the car back, faults were gone and touchscreen was working perfectly. Anyway, fast forward to yesterday, the same thing happened gain. Same faults, same dead touchscreen. I went back and had Sears test the battery. They said battery and charging system OK. Results are:
Voltage 12.76,
Measured 1049CCA
Rated 900CCA
Temperature 110 F
So if not the battery, what else could be causing these symptoms/problems? Anybody run into this before?

 

It is still almost certainly the battery. New batteries are very rarely fully charged at purchase. If your pattern of use is either infrequent or/and involves mostly trips of less than 39 minutes, the likelihood is that your battery is now not putting out sufficient voltage to keep all the modules happy (and I note that you have had the battery tested). Do you have a CTEK (or other) battery maintainer? That eliminates any battery issues.

 

No CTEK and no outlet in the garage even if I had one. As for charging. I took the Jupiter FL yesterday on the turnpike,one way and US 1 the other. On the way down, the touchscreen came back on. Then on the way home, it went off again and has not come back on again. At any rate, that trip should have certainly charged the battery. The drive was a little over an hour each way.

 

I am more surprised to see Sears is still in business.

You proved what causes the symptoms when you replaced the battery.

Here is whats happening; 1. you could have got a batt that had been sitting around and lost its capacity. Because a car is not really meant to charge a battery- just maintain a charge. 2. You could be for some unknown reason not sending much juice to the battery, and it killed your first battery. (but this is the lest likely scenario)

Next time buy your battery from a place that replaces them no questions asked.

David Christensen would be able to tell you exactly what's wrong.

 

BTW, an hour each way is not enough time to recharge the battery if:
Most of the accessories were running.
If you were at highway rpm
If the battery was weak to begin with.

It could also be that the computer has not calibrated how much capacity you now have with the new battery- keep in mind no one told it the battery is new.

 

Attach a battery charger to the battery, preferably with the battery removed from the vehicle, and allow it to charge overnight.


What is the alternator output at idle?

 

No idea on output. I'll try a charge.

 

Got a Shumacher Battery Maintainer and got it wired in yesterday. Still getting the TPMS fault but the touch screen is back. I know the tire pressure is OK, as I had new tires installed yesterday. Could be another night on the maintainer will solve the issue.

 

Did the tire guy test and read the status of your TPMS sensors in the tire. They should be able to tell you whether the TPMS batteries are good.

 

If you continue to get a TPMS fault, it may be that the lithium-ion battery in the wheel sensor is reaching the end of its service life.

Sensors must be replaced when the battery loses power as the battery is not serviceable.

 

I was getting TPMS fault around 2 years ago - disconnected the battery, shorted the pos to the negative and haven't had any issues since - I'm driving a 2009 XKR so the batts are still good.

 

Problem still there and the battery maintainer hasn't resolved it. I called the indy I used with my last XK and he suggested that I disconnect the battery and teen reconnect it. Anybody know how that could affect the issue?

 

Your car hasnt been made aware of the new capacity
Or
You have a bad battery (diminished capacity) from sitting on the shelf too long.

 

Hey, I have that!

 

Did they check the batteries in the TPMS sensors in the tire.

 

Dint know you were on the shelf.
Put one of these plates on your car.

 

I developed these EXACT symptoms recently. And I had my battery changed about two months ago. Have been getting what I call the Christmas Tree lights - when the TPMS light switches from wheel to wheel on the little icon so it's all lit up. (also, one - and only one- day this summer I came out to a dead battery. Got AAA to jump it, fired right up, haven't had the problem since.) Then, yesterday, screen went black.
Guess it's time to go back to where I got the battery...

 

PK, be sure to let us know if the battery solves the "Christmas tree lights" problem as that will add to the discussions onTPMS problems as well as blank screens.

 

Will get it checked tomorrow. In the meantime.... trying to cover all bases including the unlikely scenario that this is a fuse issue. Looked in fuse guide in the manual and can't seem to find which fuse covers specifically the touch screen. Does anyone know this?

 

Fuse 14 in the fuse box behind the rear seat.