I changed the battery on my 2007 FL2 HSE and it caused the dash to light up like a christmas tree. Nothing worked except the fuel gauge. All the warning lights were lit and I had no speedo or rev counter. The mileage was 999,999 and the trip counter wasn't working. local garage advised update was required by a LR dealer and I duly booked in at my nearest one. They carried out the update of the dash software and all was restored except for the mileage which still read 999,999. The dealer did a phone round of his contacts and the only thing he offered was that there was a possibility that the mileage would reset after driving 183 miles (why that odd number i will never know) but if it didn't then it would have to be a new dash unit. Well more than 200 miles later and still no reset of the mileage. I can't afford a dash replacement (circa £800 fitted) and was wondering if anyone on here had suffered a similar fate and knew if it was possible to somehow reset the mileage. I am assuming an illegal hack but if it can be done and was reset to the last MOT mileage plus 5000 miles (I have never done more than 5k in any year since I have had the car) then surely that wouldn't be dishonest.
Hoping someone can give me some useful pointers.

At startup, the car compares the value stored into instruments with the values stored in 6 other ECUs.

Strange one this is hope you sort it.

3landertwo wrote:

At startup, the car compares the value stored into instruments with the values stored in 6 other ECUs.

SYFL2 wrote:

Strange one this is hope you sort it.

I can't wait until we go all electric!

Something else is going on with your car. Changing the battery should only cause various equipment to loose some settings such as window opening and closing end points. I’d guess that some of the wiring has broken down and continuity is not constant. Something similar to forum member oldgeezer experienced with the earth lead which caused him years of problems. Have you fitted a second earth strap from the battery to (normally) the starter? Cars from 2007 don’t have them.

The car itself seems to be running fine, even when the dash wasn't working before I got the software updated. I have never had this much hassle when simply changing a car battery.
I fitted the extra earth lead a couple of years ago.

I presume that you have done the complete reset sequence. Silly question perhaps but is it a legal requirement to have a working odometer ? 3 x FL1 2 manual + 1 auto
5 x FL2 4 manual + 1 auto
Now Discovery Sport P250 MHEV SE

It is not a legal requirement to have a working odometer - how would the MOT examiner test it?

There are people who offer "Speedo correction" - for those who have fitted replacement clocks
Maybe you have fitted genuine new clocks and want them to honestly reflect the vehicle mileage, maybe you have fitted clocks from a breaker and the doner vehicle has done 100,000 miles more than your excellent low mileage vehicle. The guys don't care as long as you pay. Yes the mileage is stored in several units, and these units will note a mileage mismatch, they will continue to function normally with no indication on the dashboard.
Someone with the ability to read the faults on all the units can note the mismatch - do you normally interrogate the transmission ECU when buying a second hand car, does the dealership when they buy the car off you?

Speaking from experience.  Tangiers Orange - gone, missing her
Replaced by Ewok what a mistake - now a happy Disco Sport owner

dorsetfreelander wrote:

I presume that you have done the complete reset sequence. Silly question perhaps but is it a legal requirement to have a working odometer ?

Andy131 wrote:

It is not a legal requirement to have a working odometer - how would the MOT examiner test it?

There are people who offer "Speedo correction" - for those who have fitted replacement clocks
Maybe you have fitted genuine new clocks and want them to honestly reflect the vehicle mileage, maybe you have fitted clocks from a breaker and the doner vehicle has done 100,000 miles more than your excellent low mileage vehicle. The guys don't care as long as you pay. Yes the mileage is stored in several units, and these units will note a mileage mismatch, they will continue to function normally with no indication on the dashboard.
Someone with the ability to read the faults on all the units can note the mismatch - do you normally interrogate the transmission ECU when buying a second hand car, does the dealership when they buy the car off you?

Speaking from experience.

Complete reset.

Disconnect BOTH battery leads negative first, touch them together for say 30 seconds.
Refit the battery leads, positive first.
You will need to re-calibrate the windows - send one all the way down, release the switch and then while it is down send it down again holding the switch in the down position for 5 seconds. Send it up when it gets to the top release the switch, then operate the up button again for 5 seconds. Repeat for the other windows.

The idea is to discharge all the ECUs and let them have a clean re-boot, you will be surprised the number of times that this does work, The FL2 is a mix of several computers, not all of which boot up in the right order, even worse they don't always shut down completely, if one stays alive it will boot too soon and can stop the others. Tangiers Orange - gone, missing her
Replaced by Ewok what a mistake - now a happy Disco Sport owner

Andy,
I did that when the initial issue happened after changing the battery. I was toying with the idea of doing it again but don't want to cause the dash to go tits up again so have thought better of it. If it causes the dash to go again then it's another trip to Landrover & another £150. #dilemma!

In my experience with electronic equipment, this kind of hard reset can physically damage some circuits and components due to autoinduction surcharges. Moreover, when you short the two power cables, different capacitors with different working voltages, from different modules are shorted too, and the energy contained in, is discharged with significant current surge. In electronic equipment capacitors are slowly discharge through ballast resistors, or by their internal resistance, in time, not by shortening the terminals especial on high capacity high voltage capacitors. So, I think that is possible that your odometer has suffered a physical damage , not only software problem.

Bomeo
Although I don't fully understand all you said, that's the sort of thing that makes me avoid anything electronic. What used to be such a simple thing to do (changing a car battery) can now cause untold damage to the car's system. When we go fully electric, unless you have a degree in electronics, there will be very little home maintenance of vehicles possible so being able to afford a car, irrespective of the initial cost, will be crippling for a lot of people.
Thanks for your input, I will be biting the bullet and getting an expert to have a look at it as soon as i have saved up some money.