Complete list of bizarre electrical gremlins caused by low battery voltage
#101
07-04-2014, 06:08 PM
Veteran Member
I put a new agm battery in my xkr 2 weees ago, 210 euros after electric problems, cleaned starter lead under left rear bumper, connected with a nut, look and see, remove rubber cover, mine was a green corrosive.
I would say all battery companies are in a state of mourning since jaguar announced the end of the xk
, i suppose they'll make handy money for a few years yet with us owners out there.
I would say all battery companies are in a state of mourning since jaguar announced the end of the xk
, i suppose they'll make handy money for a few years yet with us owners out there.
#105
07-06-2014, 10:03 AM
Veteran Member
The dealer will replace your battery if found bad. I had mine replaced in my 1-year old XJL because of all the frequent Low Battery warnings. I am about to take the car for its 2-year service and will further complain about the same issue. Might get a new battery again. Needless to say a 1-year old battery should not have to be replaced.
#106
07-12-2014, 11:26 AM
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#108
07-19-2014, 01:19 AM
Seems my battery is fine (had it tested this week). But apparently there's a Battery Monitoring System (BMS) that was preventing charging. Maybe because my CTEK had originally been connected directly to the negative battery terminal, bypassing the BMS (see separate thread on CTEK wiring) causing it to lose calibration. The BMS has been reprogrammed and the CTEK is now connected via a grounded bolt, so hopefully my battery problems are a thing of the past.
#109
01-29-2021, 06:51 AM
Senior Member
My car is parked far away from any power source so I cannot have a battery tender. However, last year I got an AGM battery (I think in February or Aprilm too lazy to look it up). This seemed to help with most of my electrical gremlins. And if I drive the car frequently, I have no electrical gremlins.
Winter seems to bring the worst of the gremlins, and since winter is upon us in the Northern Hemisphere, I thought I'd try to make a list of strange things that can happen with slightly lower than needed battery voltage. This is a compilation of things I have personally experienced, and things that I have read. Feel free to add or correct things:
1. LCD between speedo and tach won't turn on.
2. Touchscreen slow to turn on.
3. Touchscreen stuck on logo screen (leaper)--may not shut off after turning off vehicle.
4. Transmission paddle shifting lazy (no blipping downshifts).
5. LCD screens contrast not adjustable with brightness knob to left of steering wheel--brightness stuck on max.
6. LCD screens seem to go bright and dark rapidly on its own--inconsistent brightness.
7. Seat memory positions not functioning.
8. Power windows intermittently inoperative.
9. Power windows one-touch feature inoperative. (Thanks JeremyB)
10. Warning message: "CHECK PEDESTRIAN SYSTEM"
11. USB media drive not recognized.
12. Passenger airbag off warning.
13. Difficulty starting car. Continued cranking over and finally starting, but running rough.
14. Infotainment screen going blank driving down the road.
15. Volume indication appears and blinks for minutes at a time.
16. ABS and Stability lights come on.
17. Power reduced to limp mode.
18. Rear park assist beeping with nothing there.
19. Doors do not dip upon pulling door handle (to facilitate opening of door).
Am I missing anything? Does anything seem incorrect?
Winter seems to bring the worst of the gremlins, and since winter is upon us in the Northern Hemisphere, I thought I'd try to make a list of strange things that can happen with slightly lower than needed battery voltage. This is a compilation of things I have personally experienced, and things that I have read. Feel free to add or correct things:
1. LCD between speedo and tach won't turn on.
2. Touchscreen slow to turn on.
3. Touchscreen stuck on logo screen (leaper)--may not shut off after turning off vehicle.
4. Transmission paddle shifting lazy (no blipping downshifts).
5. LCD screens contrast not adjustable with brightness knob to left of steering wheel--brightness stuck on max.
6. LCD screens seem to go bright and dark rapidly on its own--inconsistent brightness.
7. Seat memory positions not functioning.
8. Power windows intermittently inoperative.
9. Power windows one-touch feature inoperative. (Thanks JeremyB)
10. Warning message: "CHECK PEDESTRIAN SYSTEM"
11. USB media drive not recognized.
12. Passenger airbag off warning.
13. Difficulty starting car. Continued cranking over and finally starting, but running rough.
14. Infotainment screen going blank driving down the road.
15. Volume indication appears and blinks for minutes at a time.
16. ABS and Stability lights come on.
17. Power reduced to limp mode.
18. Rear park assist beeping with nothing there.
19. Doors do not dip upon pulling door handle (to facilitate opening of door).
Am I missing anything? Does anything seem incorrect?
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#110
05-10-2023, 02:16 PM
Junior Member
I have a similar issue, I thought you had to hold it for a few seconds, but apparently there is a little click. If you listen you can hear it. My driver door does not click and it takes a dozen attempts to get it to learn. Im guessing there is a micro switch that is not operating properly.
#111
05-14-2023, 03:54 PM
I don't have an outside power outlet - and if I fitted one, I'd probably drive off with the charger still plugged in 
That's why I have a solar panel for any period when I'm going to leave the car undriven for a couple of weeks. Of course, most of you Muricans have garages, so that doesn't help you much, but it works even if you don't have direct sunlight.
That's why I have a solar panel for any period when I'm going to leave the car undriven for a couple of weeks. Of course, most of you Muricans have garages, so that doesn't help you much, but it works even if you don't have direct sunlight.
#113
05-15-2023, 12:01 PM
OK gang, here's the bad news. Investigating vehicle electronics gone wrong is my business. Modern vehicles use LOTS of electronics, all powered by the battery. Don't expect your vehicle to function if you store it undriven for 30 days or more without a battery tender/charger. Trying to start it with low voltage makes everything WORSE. It pulls down the voltage further, sets all manner of Diagnostic Fault Codes, many of which have multiple steps to reset once the battery is properly charged or replaced. If you do store it where there is no power, then drive it for an hour or more AT LEAST once a week to recharge the battery, or take it somewhere you can trickle charge it for 8 - 12 hours. FYI, a battery at 80% of its rated capacity is considered failed. So, don't let it drop and then try to start the vehicle, you'll accelerate the demise of your battery completely. If you have a voltmeter, periodically monitor your battery voltage. If it is dropping below 12.5V static (no loads on), it a sign of its aging and weakness. Parasitic loads in today's vehicles can be as high as 50 milliamps, which will drain an older battery in 30 days or less. Also, most modern Jaguars (and many other vehicles) require a battery management system to be properly reset when a new battery is installed. That may require special procedures and/or a diagnostic scan tool with capability to reset the BMS for your particular vehicle. This is why battery tenders are highly recommended to prevent these problems in modern, electronics-laden vehicles. Good luck!
#114
05-15-2023, 04:15 PM
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