Thread: Flat battery D3 TDV6

Thanks Drivesafe, this time I've already pulled the battery out of the car so I hope it doesn't upset the ECU or any factory settings.

Thank heavens, it's not like the old days, there are no security codes needed anymore.

Just reinstall the battery and reconnect your POSITIVE ( + ) terminal FIRST.

then connect your negative.

You will have lost your TRIP milage info and sometimes your radio stations.

But there is no issues like there use to be.

Originally Posted by Brightsbane

Thanks Drivesafe, this time I've already pulled the battery out of the car so I hope it doesn't upset the ECU or any factory settings.

As long as you let the vehicle "go to sleep" before disconnecting the battery everything should be fine...

What happens if the battery is disconnected before it goes to sleep and can it be fixed?
Also will it still go to sleep if the rear tailgate is open.

Thanks

Hi jarrods and yes and yes.

If you disconnect the cranking battery before the vehicle goes to sleep, you may find that after you reconnect the battery and you start the motor, you get any number of error messages being displayed.

If this happens, the vehicle usually resets everything the next time you turn the motor off and let the vehicle go to sleep properly.

There is a real nifty indicator on Land Rovers, that tells when the vehicle's computers have finished their shutdown routines ( the vehicle has gone to sleep ).

When you have applied the Park Brake, turned the motor off, and locked the vehicle, you may have noticed that the Park Brake light remains on.

While this light is one, the vehicle is still going through it's shutdown routines.

Once the light is out, it is then safe to work on the vehicle's battery/electrics.

I've just tested for a parasitic draw and there seems to be about 0.3A after the car goes to sleep. Is this about right?

Yes. If you're concerned about it there is a thread on disco3.co.uk about diagnosing parasitic draw in D3s. But your problem just sounds pretty normal - you just need to get into a good charging routine if using the vehicle for short trips.

Ok thanks. After charging the battery for 24h then re-installing into the car doing some diagnostics and letting it sit overnight, it still wont crank very well (just barely started this morning). I'm guessing the battery is stuffed so I'll go out and buy a new one. Can these be bought off the shelf from Repco etc?