XJL 2015 GPS does not work......Antenna problem???? soft ware update???? where is the antenna:::: the little hump on the top back roof or ????, Also a flashing light on the dash....for the lights that go on when you turn a corner??????, ECO doesn't work …(that which turns the engine off at a stop sign .but I don't like it anyway, Is the drivers seat suppose to go way back when the door is open??? ....thanks

 

Because you have a variety of apparently unrelated electrical problems, I suspect that your primary battery is low and needs to be recharged or replaced. Many random electrical gremlins happen when the primary battery begins to fail. Your XJ has two batteries, the large primary battery and the smaller stop-start battery. If your stop-start isn't working, that's a symptom of a low primary battery.

Charge the primary battery with a 10A or better charger until it is at 100%. Use a battery charger, not a battery maintainer like a CTEK that charges slowly. Connect the positive (red) charger clamp to the positive (red) battery terminal and connect the negative (black) charger clamp to a chassis ground. Note that there is a BMS (battery monitoring system) on the negative terminal of the battery. DO NOT connect the negative charger clamp to the negative battery terminal; doing so will damage the BMS! The BMS monitors the rate of charge along with the ECU . When the battery is fully charged let it sit for a couple of hours and measure the voltage, which should be 12.6V or better. If it's not, you need a new AGM battery. Start and run the car and measure the voltage. It should be between 13.5V to 14.2V. If it's not, you have a charging system problem.

If you need a new AGM primary battery, I recently had mine replaced at Pep Boys with a Bosch AGM for $175.99 installed, plus tax, and am very pleased with it.

If your electrical problems are gone, you got lucky with just a low battery. If not, refill your wallet and see your dealer.

 

Stuart S Thanks a bunch for your word...….I am not very lucky……but I will see...….thanks LeRoy C.

 

Yes listen to Stuart. The battery problem can look like a million different things at first.

You may have a very simple fix!
Also with a 2015 are you under warranty?
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The small battery ..for the ECO (stop and start stuff) is dead!!! I will replace it ...and it is hard to find and expensive $290.00 only at a dealer.....it seems...I hope ;this maybe solves my GPS problem too.......thanks to all for this info.....LeRoy C.