Another D2 central locking nuancr

Searched the forum and I can’t find another thing quite like this, so apologies for another central locking post.

My 2001 D2 has a door not registering closed which I need to track down. Pretty sure it’s not the bonnet though!

If the car is left for 6 hrs or so, the fob no longer works the central locking. A key in the drivers door does, and then the fob will deactivate the alarm. If you just unlock the door with the key and open it, the alarm goes off as expected, but if you unlock and then use the fob, the alarm deactivates and everything goes back to normal (other than the door open warning)!

Has anyone come across the same and know if this is an issue or normal behaviour?

None of it sounds normal......

Not sure about the door not showing as closed, but if this was the case you would get a mis-lock when locking. Do you get the mis-lock tone when locking?
As far as the fob not working after 6 hrs, this may well be either the fob battery, or if you are sure it is OK, it sounds like a faulty receiver in the roof. They suffer from water ingress and stop working. It has also been known that wherever you have the vehicle parked there maybe a source of interference stopping the receiver working with the fob. Try moving where it is parked, there was a thread elsewhere (www.d2bc.co.uk) in relation to certain shops that caused this phenomenon to occur. The fact it works once you are in the car shows that as you are that much closer to the receiver, the interference is blocked out by the car itself, maybe...?

Tony

As Tony, @Hellastony has already said, many of the central locking problems could be down to moisture ingress to the RF receiver unit which is located in the roofspace just in front of the rear sunroof. Check also that the securing bolt (if you have one) is clean and tight since the ground for the unit is picked up through the body.
Some problems in the central locking system could also be due to moisture damage to the Body Control Unit (BCU) which is located up behind the passenger's glove box.
You won't see any door switches on the D2, they're all built into the door latch assembly. It would be interesting to know also how the courtesy lights work in the vehicle, whether they come on and off as expected since they're controlled by the door switches too. If any of the door switches or the bonnet switch is at fault then as Tony has said, you should get a mis-lock signal.

This issue is quite common btw... actually it's not a serious fault so live with it or replace the BCU, it goes to sleep too fast and by using the key it wakes up, i've seen it few times myself even on mine, i could afford at that time and fitted a bran new BCU and it's sorted, read 433 instead of 315 in this bulletin the rest is the same except that dot on the BCU which is NAS specific and the VIN range might be different : http://landroverclubvi.weebly.com/u...de_troubleshooting_and_upgrade_8601nasf_2.pdf

Thanks for the replies. Very useful.

Just to confirm a few bits of info, yes, I get a mislock horn blast when I lock the car. The courtesy light behaviour also confirms this, as the manual says that if a door is left open, the courtesy lights turn off after 8 minutes rather than the much shorter usual time. My TD5 does the 8 minute thing.

So things to check are the sensor. I have no sunroofs, but assuming it is in the same place, just forward of the rear sunroof position. I will check with RAVE. And, the BCU. There is no visible moisture up in that area, but being a Discovery, I will not rule anything out.

Am I right in assuming a replacement BCU needs syncing with the ECU? I have not played with them before but have access to the appropriate diag tools if that is the case. Will also check on RAVE.

Thanks again, really useful to send me in the right direction.

The misslock has nothing to do with the BCU's sleep mode, nor the receiver(if that's what you name "sensor") for the misslock you must find which door's switch is not working and replace that actuator, provided it's not a wiring issue which can be a nightmare to find, let's hope not. .. Replacement BCU needs complex programming
- the engine ECU must learn the new security code
- key fobs must t=be programmed
-settings in the BCU must be addapted to the vehicle's equipment