V Reg Central locking won't lock

Have checked threads and can't find a match - so here goes.

1999 Discovery Td5 - Yesterday I removed starter motor and replaced contacts in starter solenoid. This went relatively well apart from trying to replace the top nut on the motor which is still in the kitchen!

When I re-connected the battery and gave it a whirl it started and I felt great joy - short lived as when I went to lock the car all I got was the dash light flashing for 10 second but no doors locking. Tried this a few times but always the same.

Could I have disturbed some wiring somewhere or a relay/fuse blown? It worked fine before and I have had the battery disconnected about three times in the last month with no problem.

Thought I would ask before starting to trash the thing today.

Any pointers most welcome.

there could be just a coincidence.... first thing replace the battery in the fob. then if no joy we'll speak again:
"Handset battery low indicator: If the handset battery is low, the driver's door is open and the ignition is switched off, the LED flashes two pulses of 50 ms on, 50 ms off, every 10 seconds."

by the way... do the dash switch lock/unlock the doors?

Thanks Sierrafery. I haven't got a spare battery at the moment but have just been out and started the car (first time - ok). The interior lock/unlock switch doesn't do anything (it did the other day).

When I press the remote lock on key fob the indicators all do what they are supposed to do but the indicator lights at the front and rear (outside) do not flash (they do on the panel).

I did notice that when I got in the car the red light was flashing on the dash board about every 2 second even before I put the ignition key in.

hmmm... it seems that there's a bigger problem then...it needs some more investigation:

1. if you push the hazzard switch are the lamps outside working?
2. push the fuel flap release switch and tell me if it opens the flap or not

these are the first steps to rule out(or not) some things

Search scribd for "landrover alarm" I have all yu need to know on there.


http://www.scribd.com/mobile/doc/36128411

Many thanks for your help so far. Due to lack of time today all I have managed to do is check that the fuel flap opens - it does and the hazard lights - they don't!
New batteries for keys tomorrow but in the meantime I will study the key setup operation kindly provided.

that scribd file is for the 10AS security system which is not the case here, the Disco 2 alarm system is different and it's managed by the BCU(body control unit)... as you say that the hazard lights dont work at all, neither does the central locking from the switch it seems that there is some electrical problem other than the fob failure

check fuse F14 in engine bay and F15, F21 in the under dash fusebox

if the fuses are OK we'll speak again

Thanks again Sierrafery. Will get on to this tomorrow and report back.

sierrafery said:

that scribd file is for the 10AS security system which is not the case here, the Disco 2 alarm system is different and it's managed by the BCU(body control unit)... as you say that the hazard lights dont work at all, neither does the central locking from the switch it seems that there is some electrical problem other than the fob failure

check fuse F14 in engine bay and F15, F21 in the under dash fusebox

if the fuses are OK we'll speak again

Click to expand...

Just as I thought-Count- but further down the page there's info on the D2 system in the same format (page by page) as the 10AS kit.

discool said:

Just as I thought-Count- but further down the page there's info on the D2 system in the same format (page by page) as the 10AS kit.

Click to expand...

sorry then... i saw just the title and jumped into conclusion... apologies to The MHM

Sorry for the delay in getting back.

I have checked all fuses and all are ok both in engine compartment and also under steering wheel. There is a burnt fusible link FL13 but feel this has been like this for some time? There has obviously been work done to the electrics before I owned the car.

Closer investigation now reveals the following not working:
No rear wash/wipe
No indicators front and rear
Yellow sidelights? at front illuminate when lights turned on
No rear window control up/down
No interior locking
No front or rear fog lights.

Strangely I can activate the central locking (although the side light don't flash and the doors don't lock) but when I open a door - the alarm sound off as it should. Can reset by unlocking and car starts fine.

The only two wires I removed from the starter motor were the red wire and the wire with the spade connector. I am at a loss as to what has happened to knock out so many systems?

Getting very upset with this car as it is definitely now tending towards the unreliable end of the scale.

MOT due in 2 weeks so not looking good.

it must be some coincidence ...u couldnt have disturbed these circuits from the starter these systems are managed by the BCU and IDM(intelligent driver module, integral part of the intern fusebox)... these two units are quite often exposed to water ingress due to leaking windscreen seals.

what you can check by yourself are theyrs plugs for water ingress/corrosion/bad contact: disconnect the main battery, unplug them and chec, (the BCU is behind the glovebox the one with four plugs in line and one aside) ...after that reconnect the battery, plug them back then turn ignition to pos II and let it so for 3 minutes.

if you have RAVE read about the Body Controll Unit in the workshop manual ... if you are well trained in electronics i can tell you about some measurements, if not that's way beyond the skills of a "layman"...u need somebody who knows how D2 systems work

As usual - thanks Sierrafery. The car is dry inside so it will be a great coincidence if this is this problem - that said - I am pretty well convinced there is a little guy hiding round the corner with some D2 death ray he keeps pointing at my car!

I have a copy of Rave and am not great at electrics but am willing to give it a bash. Will try and get the BCU out tomorrow if my grandson/weather permit and will report back.

I have now read all I can about BCU and IDM on Rave and will have a go weather permitting.

Just to clarify - disconnect battery, disconnect BCU - check - re-connect BCU then battery. I ask only because you said to re-connect the BCU after re-connecting the battery? Should I not re-connect the BCU before the battery??

Regarding the IDM - can this be disconnected?

Sorry to sound thick - I am.

always disconnect the battery before the work and reconnect after the work is done...so reconnect everything then the battery

to disconnect the IDM u have to unplug the whole intern fusebox cos it's integrated in the circuit board....u have to disconnect the fusebox anyway to check the plugs for corrosion

Sierrafery - what a star!. Removed BCU and there was sign of moisture but connections appeared dry. Replaced all connectors then battery cable and did the 3 minute wait and......bingo - everything back as it should be.

The BCU seemed dry but the aluminium unit next to it was cold and a little damp. Should I spray WD around or do you recommend anything else?

Once again - many thanks - until the next time!!!!!

if there was only one unit near the BCU that's the SLABS ECU(u find it in RAVE-Brakes or rear suspension if you are on airsprings) ... usually there's a 3-rd unit there the ACE ECU if the car is ACE equipped(Rave -front suspension -ACE). Clean all contacts there and investigate where the moisture comes from cos u'll have trouble.

I'm glad it's sorted for now, at least you'll now next time... for some reason the BCU lost communication with the IDM...u better investigate the fusebox's plugs too when you have time

Again many thanks. should have remembered the SLABS ECU as I have done both air springs and ABS fix so far with the help of you guys here on the Zone.

Wonder what gem awaits me round the corner?

By the way - any idea where I can get a replacement key body as the lock button has just developed a hole! Landrover dealer wanted £100 which I thought was reasonable...... however declined very politely!!!!!!

i've got the fix for my fob from here Repair Kit for Land Rover Discovery 2 TD4 TD5 / Rover 75 Remote Key Fob Case | eBay ...but if u scan ebay uk for "Discovery 2 remote" u'll find loads of it

Hi. I have the same ploblem with water getting in onto the BCU. If you disconect the BCU someone has said you may have to have it recoded or can you just reconect and carry on. Is there any truth in this or have they got it wrong.