2007 XK. Battery went dead and I replaced it. Now, almost nothing works. Absolutely nothing when I press the start button. Brake pedal seems to have no travel. Interior and exterior lights work, radio lights up and I can hear the CD player cycling bit that’s it. Nothing from the wipers. Horn works.

When the battery went dead, the top was down so I released the hydraulics and manually raised the top to access the battery.

Frankly, I don’t know where to start. I am 100’s of miles from a dealer. So any advice would be enormously appreciated.
Frustrated in Florida.

 

Either you replaced it with a dead or nearly dead battery, since zero purchased batteries ever come CHARGED..... or you have the battery connectors not connected properly.
Or maybe something else, but I'd start with those first two things.

 

"Brake pedal seems to have no travel."

Try pressing really, really hard on the brake pedal when you press the start button. You may have lost pressure in the brake system.

It happened to me a few times in my '07 XKR and seems to be quite a common issue.

 

Thank you. I am confident that it is connected properly but I will take your advice and put a charger on it.

 

I will give that a try. Thank you so much for your advice.

 

The first thing to do is to attach a voltmeter to the battery terminals. If you don't have at least 12.6 volts your battery is weak and will cause all sorts of electrical problems. Use a 10 amp or more battery charger (not a battery maintainer or trickle charger). See your Owner's Handbook. After your battery is fully charged ...

Press and hold the START button before you step on the brake pedal. It should start right up.

Inadvertently pumping the brake pedal will cause it to feel high and really hard to depress. If that happens, use both feet to depress the brake pedal with all your strength while pressing the START button.

Good luck!

 

Mine did that after i replaced the battery in my 2007 XKR.Had to get my strong buddies in the Army to help press the brake pedal all the way dow to the floor to get the thing to start.idk what's up with your power on issue cause it atleast should be able to power the car on when you press start.Might want to stay away from the brakes until you get some juice for the Jag to be able to power on without starting cause that would just make the brakes harder to press the more you press them without starting it up

 

Thanks so much for the advice so far…..

So I put a battery charger on and it reads 12.9 v. Charged it awhile anyway. Verified all connections. Put an enormous amount of pressure on the brake pedal with hope and still nothing. No sure where to go from here.

Suggestions? I will try anything.

 

Do a hard reset: (a) Disconnect both cables from the battery. B) Hold them together for 2 minutes. C) Connect them and see if lights, etc work. D) then starter. This has corrected a couple of WTF? conditions with my X150.

There are several conditions that allow the starter to spin. One is the brake pedal. Seriously, no need to beat on it. Just push down steadily while holding the start button. Ask someone to stand behind the car. If the brake light goes on, the brake interlock condition is satisfied. Don't push down like kong or you may damage your master brake cylinder. It's just a brake light interlock to make sure your foot is on the brake.

There are other conditions. Is your shift in park or neutral? Jiggle it around and settle it in park. Your operations screen, between the speedo and tach, should tell you if a start condition is not met

Third start condition is your key being correctly read by the ECU. Very possible that replacing the battery, with all the connect/disconnect/reconnect that goes on, has confused your relevant ECUs. Hard hard reset should help.

Does the key open the locks? If not, you may need a new key battery.

Note that you'll need to reset your window stops. Press button steadily to either direction stop. Release the switch. Press again same direction for a count of five. Release the switch. Then do the same thing in the other direction, to the stop. Release. Press switch same direction for count of 5. Test your windows, should now stop at the right location.

 

Oh, and maybe stick the Smart Key into the Emergency Slot?

 

did it atleast power on?If it powered on,that means you in business!Next thing you gotta do is the same thing when king Arthur pulled the sword out the stone,but this time it's with your brakes.You have to use every ounce of strength you have in pressing the brake pedal the same way you put your foot down when your woman is out of line, but LITERALLY!

 

I did the hard reset and no change. I don’t suspect the battery in the fob since it worked right before the battery change but I will change it anyway.

Note that pressing the start button does nothing, not even to accessory mode without brake depress. The brake lights do come on when pedal depressed and nothing happens with high pedal effort. Since I can’t even get into accessory mode, I don’t think that’s the problem. All interior lights and headlights work and that’s about it. The Jaguar logo appears on the screen but that’s all. I do hear the CD changer cycling. Horn works, wipers do not. Fob does nothing.

Could this be a fuse? I will start checking those. Changed battery before with no problem. I will be happy to try any other suggestions.

Again, I am hundreds of miles for a dealer so a tow would be prohibitively expensive.

 

mannnn you just might be on to something cause it could just be a fuse then.Wish i knew which fuse,but u gone have to do some research to find it if somebody here dont help you find it 1st.The car is a 2007 which means wear and tear and things begin to burn out little by little.

 

I suspect that your START button may be the problem. It's 15 years old and could be worn out or full of grime, etc. It's not that difficult to remove and replace with a new switch. See:
https://www.jaguarforums.com/forum/x...button-163145/

 

Still, all these are indications that your battery is at fault.
the observation of 12.9 v from the charger does not necessarily reflect the voltage of the battery.

Please start by having a battery with at least 12.6 v. installed properly.

 

Try a jump start directly to the battery (not the remote terminals in the boot). Also check the negative cable connection to car’s earth.
If jump starting from another modern car, make sure that car’s alternator isn’t in low power mode due to BMS. Turn on that car’s headlights to get full 14+ volt output.

 

@cstanard some are convinced it's still your battery. They aren't magical hook ups but please do us a favor and eliminate it by using a voltmeter at the battery, leave it off the charger overnight and then check the voltage directly on the terminals in the AM. It must read 12.6 volts or higher. I think you've beat that one to death but humor us.

Next, the starter button doesn't have a fuse but the circuit is run through the start control unit which is powered by a mini amp fuse in the central junction box. Fuse 7. Check it. Fuses do occasionally pop when connecting to a new battery. Fuse F19 in the engine bay controls the starter motor. Check that too.

Then I would move on the the start button. You obviously need voltage there. easy enough to test for voltage once unplugged. Here is an excellent tutorial on how to clean it.

https://www.jaguarforums.com/forum/x...2009-a-254548/

 

I had trouble starting my 07 XK when replacing the battery. I don’t know what I did exactly but I made it so if something good could happen it would.

key in holder. Doors closed. Transmission in park. Foot on brake. Take a deep breath. Then press and hold the start button.

my XK was definitely finicky. Try different combinations of quick press and press and hold with the foot on/off the brake and see if you can get it to turn or start.

 

The OP's 2007 XK doesn't have BMS. The Battery Monitoring System began with the 5.0L models.

 

I'd have that in there for any of the troubleshooting at this point.