I just put on the summer mags and tires with the aid of small hydraulic jacks. Then I went to move the car, and nothing is happening. The start button doesn't react. I put the fob in its holder and it was received but still no ignition lights. Used the second key fob. The only lights are in the trunk when I used the metal key. Next I may use the key in the door lock.
I need other ideas!
Just the small rear parking lights are on with or without my 2amp maintainer.

 

Did you have any doors or hatches open? If so, your battery is flat. If everything was closed, your battery may be flat.
Check the obvious first. Even check the clamps on the battery.

 

Thanks Cee Jay. Will charge it now.

 

The 6 amp charger hit 8 amps, then settled at 4amps, and the car is giving me signs of life.
When it was shut down, even the shocks are stiff and didn't move at all.
The small rear lights have turned themselves off.

 

What Cee Jay said - I lost a battery due to letting it discharge with the doors open while detailing - the puddle lights stay on rather than shutting down after a delay.

I disconnect the batt when doing any long detailing or work with the doors open now.

 

At only four amps, it will probably take 24 hours or more to get near a decent charge. With a battery that flat, a 10-20 amp charger would be best. Those would still take quite awhile to charge.
With a battery that got low enough to not start the car, it probably will not last much longer. Just be aware and prepare yourself for a replacement.

 

Down to 3 amps so I added the 2 amp maintainer. FOB locks the doors now. Its a group 49H8, AGM. They can be taken down lower than wet cells and not suffer like wet cells.

 

…. a battery that dies in the time it takes to change tires…. even with a ratchet wrench and a hand jack is not a battery I would be counting on.

 

I see it a bit differently. I am quite sure the battery is good, but a set of circumstances got it at a weak moment. The tendency in the forum is to plop in larger batteries, to supply the too many computers with their need for amps, even while sleeping.
I have been using the car as a daily driver for short distances in 15F degree days, and not using the battery maintainer. Because the alternator is setup for an OE smaller battery, mine won't get a full charge as a daily driver of short trips.
AGMs can be drained to a relatively low level, without performance consequences.
Now I will use my maintainer, to cover the shortfall of the alternator.
I thank Cee Jay, for his quick and accurate response!

 

Editorial comment, I guess. If anyone want to own a 10-14 year old Jag...get a jlr compatible reader and a DVM. Less than $100 combined on Amazon. Always welcome to help with any questions, of course, but if your car won't even respond to the start button, meter the battery for starters. Then hook up your Autel AP200 (or equivalent jlr compatible OBD) and get some actual data to work with. It's tough to offer useful feedback to "My car won't start".

The third thing to do when the car doesn't respond to the start button is the (factory recommended) hard reset. Remove both battery leads and hold them together for 30 seconds. Then reattach them and test the start. My '07XK NA will get it's brain occasionally scrambled when I pull out the OBD out without shutting down the app first. A 10mm wrench and a hard reset later, it starts up. Happened twice, both with me impatiently removing the OBD scanner before the app was shut down.

These aren't expensive tools -- they're equal to 1/2 hour of a mechanic's time. Help us help you (all) by providing us real data to work with. Oh, and the year, model and mileage helps a lot, too.

 

I've never seen anyone who tried to install a larger battery, as it wouldn't fit. These group 49 are pretty much the largest automotive batteries around as they are.
I do agree to having too many short trips can affect the charge. Hopefully that is your entire problem.

 

Another one to watch on these aging cars is the alternator. Should hover around 14V in operation.

As mine began to die, the voltage generated began to decline into the mid 13's. Probably a failing Regulator or bad brushes, but then it abruptly failed completely.

Didn't tear down the old one to examine, as I needed to return it to cover the core charge.

 

The havoc caused by low starting voltage can, on occasion, cause a glitch that disrupts module program(s) beyond simple rectification, requiring SDD to resolve.

 

@sony2000 If you haven't already done a hard reset, that's the first thing you should do before buying an Autel AP200 or similar OBDII diagnostic scanner with the Jaguar software. A hard reset discharges the capacitors in most of the electronic modules and resets them to their original factory defaults. This might fix your starting problem without needing SDD.

It's easy to do, doesn't cost anything, and it's worth a try. Good luck, and let us know what happens.


Stuart

 

Well couple of overnights on the maintainer (2amps) and all is well. I have a clone of the CDs to address the SDD, found the cables in the center consol and hope to reach the main computers sometime in the future, if needed. While driving I have been using a ELM 327 and my phone, to check on water temp and charging rate, but my new HUD P8 digital gauge just arrived. I will let it sit on the left of the dash by the post and show me the coolant temp and Kms/hr speed, while driving all summer long.

amazon.ca/wiiyii-Display-System-Installed-Pillar/dp/B0957V8VMC/ref=sr_1_8?dib=eyJ2IjoiMSJ9.2GV_SykWbWqtM0

Next on the list is to break into my glove box without breaking it, and schedule a wheel alignment and inspection. It never stops. But the pleasure never stops, as well!

 

That’s the best thing about these cars: whatever the trouble, the pleasures never stop, and they almost always outweigh the troubles.

I can knly reiterate here that I owned a range of BMWs, small to large (325i to 730i), other Jags (XJs), previous XKs… none of them matched my XKRs (4.2 X150) on any serious account.

 

1. Programming: SDD will upload data to your laptop prior to programming activities. If you see red Xs because software was not resolved, ABORT!
Downloading zeros disables your vehicle and is very time consuming (but educational) to resolve. There are better ways to use your time/learn SDD.

2. Your glove box is likely stuck in valet mode. Check that first.

Post your experiences to share with others.
Best of luck!

Bill

 

You can easily discover if Valet Mode is selected by attempting to open the boot with both the smart key and the on-dash boot button. If neither work, unlock the boot using the Emergency Key Blade. That will disable Valet Mode.