Yes I have power locks, depressing the remote keypad button all doors lock.
Unlocking, 1 depression and the drivers door unlocks and the second depression should unlock all others, which it doesn't.
There are no mechanical noises, it appears something is trying to unlock, but nothing
The dashboard unlock/lock tab also has no effect.
The vehicle is a Discovery.
Cheers,
Geoff
Ahh Ok....If it is not urgent I would like to spend some time reviewing the wiring diagrams so that I can make sure I dont miss something here..If its ok with you I will post back here in an hour or so...about to finish up at work for the day and i can give this some more time when I get home for the night...If time is urgent I can opt-out of this question and see if another expert can help you with this.
Let me know
Dave
Thanks Dave,
No please take the time you require, I'm obliged you are prepared to carefully look at this and if there is a solution I'm prepared to pay extra for your input.
Ok Geoff, I just spent some time looking over the wiring diagrams and I must say this is an interesting problem. Basicly the lock and unlock circuits use the same path they just reverse the flow of electrical energy to drive the locks up or down as needed.
You mentioned that the switch on the dash does not work...did you mean that it will neither lock or unlock or is it working normally to lock the doors but it wont unlock the doors same as your remote?
The first thing I would like you to check is a earth connector, according to my information it is located behind the left hand kick panel ( note Land Rover does not always do the best job on locating connectors in there books...left hand drive and right hand drive is not always noted properly so you should check both sides)
Picture of connector C0017 is the one we are looking for. It is a white connector with 6 black wires. I would like you to check that the bolt is tight and clean..Unbolt it and scrape any paint or other debris from the post...with gound problems cleaner is better. Also if you have a digital volt meter you could verify that the ground post has a clean path to the battery by using the ohm feature ( note if you dont have one that is ok, we can work around that)
I enjoy these type of problems so this is just a starting point, and will gladly work with you till we get it figured out.
Let me know what you find, also let me know about the dash lock/unlock button..the more infomation the better with these type of issues.
Cheers
Hi Dave,
Dash switch,
Will lock, but not unlock, exactly the same cylcle as the remote (drivers door unlock)
It occurred to me, could another actuator be the problem, insofar as lock is OK but the mechanics of unlocking might be a load factor due to some sort of failure and therefore the circuit closes due to a load?
Geoff,
Ahh I see where you are going with that route and its a possiblity, one that would be easy enough to check by unpluging the door actuators one at a time as a way of elminating something.
But lets start with the gound check, easier than taking all the doors apart ...Since it use's the same circuit for both lock and unlock...my thinking is that it may take more power to unlock the doors than it does to lock the door.. Thats why I wanted to start with the gound circuit check...that is the main ground for the whole circuit including the dash mounted switch.
It could a problem on the power side of the circuit, but its been my experience that poor ground circuits are more often the cause of these type of problems.
OK, thanks Dave,
I will check the grounding,
Geoff.
Had an auto electrician check out, and advises grounding seems OK.
Hi Geoff, I have been looking over the system description and wiring diagrams some more..I am wondering have you had any other repairs recently...or how long this lock problem has been happening. The more I look at this system the more it seems like this maybe somekind of alarm configuration issue. Its just that all the wiring shows that it uses the same circuit for locking as it does unlocking...Since we only have an issue with unlock on only the passenger doors it seems like it maybe somekind of programing fault with your BCU and not a hard fault with wiring or a door actuator.
Have you had it to a dealer for any diagnoistic yet?
Another thought can you open the other doors at all, will they open from the interior door handles?
No repairs have been undertaken with this problem area.
The problem just started a couple of weeks ago, no warning just working then not working.
Dealer review, no
Operning doors from interior handles , yes that works OK
I have a spare BCM might this assist with a changeover?
Well the BCM will need to be programmed if I recall correctly, I dont think it can be just plugged in to see what happens.
Has there been any other work done to your Discovery at all? Not just related to your door locks. but any electrical work done?
Electrical work, no nothing has been done, never had a problem before.
Well I have read all the system operation manuals on the alarm and central locking system, I think at this point I would recommend having a dealer or a specialized land rover repair shop look at this with a testbook (land rover diagnoistc computer) It can do some realtime monitoring of the alarm system. I think this would be the best approach at this time, I cant see any other items to look at. And I dont want you to waste money replacing or testing things when the testbook system should be able to isolate your problem without the waste.
It could be a problem with your BCM but it would be an unusual fault, what bothers me is that the system works excatly as intended on the lock side but not on the unlock side, Intially I thought that there might be 2 seperate circuits involved and we could find something on the unlock circuit that would be the cause of this fault...but thats not the case in this system.
Sorry I could not be of more help on this issue
Land Rover Shopforeman
Land Rover Master Technican/ASE Master Technican. 12 years Land Rover Experience