different central locking problem

Afternoon. I have spent the morning searching to get nowhere.

Overnight the freelander has developed a fault. The central locking won't work from the fob or the dash button. Also the Immobilizer is activated to prevent starting. The key will lock and unlock the drivers door only. The horn sounds if you open and shut the door and the alarm sounds if you lift the bonnet.

I think that's as descriptive as I can be.

99 freelander 1.8

Cheers, greg

At a guess I'd say one of your doors isn't properly closed - or, at least, that's what your car thinks.

This needs a bit of logical thinking. It's a bit late but here goes... thoughts in red.

adamsgreg89 said:

Afternoon. I have spent the morning searching to get nowhere.

Overnight the freelander has developed a fault. The central locking won't work from the fob or the dash button. Dash central locking button is disabled when the car is locked.alarmed.

Also the Immobilizer is activated to prevent starting. I think this is because you haven't turned the alarm off.

The key will lock and unlock the drivers door only. Your key isn't controlling the the car properly when you turn it in the driver door. It's manually unlocking the drivers door only. It can do this, for example when you superlock with the fob (lock and superlock the doors and enabled interior motion sensing and alarm) then disconnect the battery, the key will only manually unlock the drivers door.

The horn sounds if you open and shut the door and the alarm sounds if you lift the bonnet. This is because you haven't deactivated the alarm.

I think that's as descriptive as I can be.

99 freelander 1.8

Cheers, greg

Click to expand...

Your car is still active as it's monitoring the alarm. The fob or RF receiver isn't allowing you to unlock and disarm, or the process behind this isn't carrying out the request. This means the car is still able to think for itself to some extent.

Disconnect the horn when the alarm goes off if it annoys.

If it were me I'd be checking all the fuses are ok. Those under the steering wheel and under the bonnet in the electrical box. I'm thinking along the lines that power has been lost somewhere, or an electrical connection has failed. Thats stopping the control signals to the alarm from complying with your disarm request. Will have a think about this unless anyone else comes up with a solution/idea.

If you can't switch the alarms/imobiliser off with the drivers door lock or fob, then put the key in the ignition and turn it to position 2.

Example: if you put the drivers window down (so you can get out) and superlock/alarm your Freelander with the fob, and you then put the key in the ignition and turn it to position 2, all doors will unlock and the alarm will be switched off. Imobiliser should switch off too. I assume this is a safety thing just incase you lock your self in your Freelander by mistake.

After spending last night and this morning playing about . Testing fuses, connections ect...

Problem solved. Disconnect the battery for 10 mins. Plug back in. All is now well

Thanks for all the help!

adamsgreg89 said:

After spending last night and this morning playing about . Testing fuses, connections ect...

Problem solved. Disconnect the battery for 10 mins. Plug back in. All is now well

Thanks for all the help!

Click to expand...

Either it was a loose battery conection or it'll be like other great and annoying electrical faults, just be coincidence and return

Hi Folks

I have a central locking problem with my 2003 FL TD4 MK1. All doors will lock with the fob but only the 2 rear doors will unlock with the fob. Have tried all the usual things fuses etc. During unlock I can hear something happening inside the 2 front doors but the doors stay locked. Is this a linkage problem?

Many Thanks

Safeman

I'm afraid I need to drag this back up!

It was a fault that dissapeared for a while however it has come back.
Its totally random and I can go weeks without it doing it and then it will do it everytime its locked so its battery off for 10 mins and back on again.

I have done a bit of reading and understand the BCU controlled the locking/alarm system.

I'm starting to think this is the fault as the interior lights only come on when the doors open not on the button. The bcu also controls the interior lights.

Does anyone know if the bcu is coded?

The key codes are in the CCU. So you need to get i programmed.

But its an intermittent fault. It reads the key most of the time

What youre calling BCU is most likely the CCU. It controls the anti theft alarm system, doors, interior lights, horn and so on.

Bcu. Body control unit. On the back of the fuse box inside the cab?

Yes that is the CENTRAL CONTROL UNIT - (CCU).

Its a way to test the CCU. I have not tried this myself, but i bookmarked it in case i ever needed to:

http://www.landyzone.co.uk/lz/1634385-post10.html

You'll probably find stm won't work on a 99 1.8, or it's not switched on in the computer to allow it to work, if it has the option to be switched on and the option to switch it on actually works.

Well these control units are easily available. If I got one where would I be for coding? Is it LR or any Sparky?

Dont want to sound obvious but have you checked the fob battery? have you had any beeps / LED flashing when unlocking, have you got a spare fob to try incase one is faulty ? ...just it hasn't been mentioned - your transponder will be in the fob not the key on a 99 plate.

That was the first thing I did. I should have said.

The other thing I thought was I know alot of alarms are quite sensitive to power . It couldn't be my battery not quite up to scratch?

If it unlocks the door when you push the fob its not the battery. The fob are sending a "digital message" that is very unique. The fob will also send a message to the car that battery needs to be changed if its weak.

There isnt really alot of work to change the CCU and program it. But you need access to T4 or similar systems.

If the fobs are ok, my next check would be the RF receiver unit (as hippo mentioned).

It has a push in connector that might just need a wiggle if your lucky or they are cheap enough on e bay to try a different one.