Cherokee lock-out

Hello. I've got a '93 Cherokee, and the central locking's started playing
up. If I press the fob, it'll lock all the doors with a suitable clunk, but
if I press it again it won't unlock -- there's a clunk, but it's not as loud
as when locking -- then I have to use the key to open the door.

The fob has three diagonal rubber keys on one side, the central of which is
longer than the other two; the central button's the one I use to lock/unlock
(maybe these three strips are all part of the same button...). Could it be
related to using the button on the inside of the door to lock them all
simultaneously? I've tried both fobs and the same happened in both cases.
Any ideas?

Cheers,

Martin

--

Martin Sketchley | www.msketchley.pwp.blueyonder.co.uk
(remove ALLJEWELLERY to reply by e-mail)

Hi Martin -

The problem is almost definately not the fob itself.

Am I correct in thinking that your motor has a 'lock/unlock' button next to
the power window switches on the drivers door? If so, does it lock and
unlock all the doors?

The principle of the system you are using is:
The remote control that you use tells the alarm/locking unit to send a pulse
to the vehicles original CDL circuit. The fault could therefore be in the
aftermarket locking system, or the cars original locking system.

Problems can also be caused by a 'sticky' or 'weak' motor in one of the
doors. ie. It receives the unlock pulse, but the motor doesn't have the
power to unlock the door.

I hope this helps,

Simon.


"Martin Sketchley" <[email protected]> wrote in
message news:[email protected]...
> Hello. I've got a '93 Cherokee, and the central locking's started playing
> up. If I press the fob, it'll lock all the doors with a suitable clunk,
but
> if I press it again it won't unlock -- there's a clunk, but it's not as
loud
> as when locking -- then I have to use the key to open the door.
>
> The fob has three diagonal rubber keys on one side, the central of which
is
> longer than the other two; the central button's the one I use to
lock/unlock
> (maybe these three strips are all part of the same button...). Could it be
> related to using the button on the inside of the door to lock them all
> simultaneously? I've tried both fobs and the same happened in both cases.
> Any ideas?
>
> Cheers,
>
> Martin
>
> --
>
> Martin Sketchley | www.msketchley.pwp.blueyonder.co.uk
> (remove ALLJEWELLERY to reply by e-mail)
>
>

Thanks Simon. The switch on the inside of the door will sometimes
lock/unlock all the doors, and sometimes not. So, no, I don't think its the
fob either. It doesn't seem to be specific to one door; either they all
unlock, or they don't. I tried it again this morning; two out of three times
it unlocked OK; yesterday it didn't work at all. The intermittent nature of
the fault is puzzling. It seems completely random.

Martin

--

Martin Sketchley | www.msketchley.pwp.blueyonder.co.uk
(remove ALLJEWELLERY to reply by e-mail)

The drivers and passenger door locks also have a switch in them. It's likely
to be one of those motors.

The pulse from alarm tells it to unlock, but because it didn't manage to
open all the way, the switch immediately tells the doors to lock again.

I would start by seeing if the doors unlock with the key from the passenger
door as it does the drivers. This might help indicate if the drivers door is
at fault.

When you turn the key in the drivers door, you are physically lifting the
drivers motor, so if that was the weak one, you have just manually overidden
it!

The next thing would be to disconnect the wires to the drivers doorlock
motor if thats the type of task you would take on?

Then try your remote again (with the door closed) and check its behaviour.
If it works all the other doors then that was the problem. It could equally
be the passeneger door causing the problem however.

My thoughts are that the alarm system is certainly not at fault. The CDL
unit is probably OK. They tend to work or fail completely. That just leaves
the door locks or a wiring fault (short circuit).

Good luck.

"Martin Sketchley" <[email protected]> wrote in
message news:[email protected]...
> Thanks Simon. The switch on the inside of the door will sometimes
> lock/unlock all the doors, and sometimes not. So, no, I don't think its
the
> fob either. It doesn't seem to be specific to one door; either they all
> unlock, or they don't. I tried it again this morning; two out of three
times
> it unlocked OK; yesterday it didn't work at all. The intermittent nature
of
> the fault is puzzling. It seems completely random.
>
> Martin
>
> --
>
> Martin Sketchley | www.msketchley.pwp.blueyonder.co.uk
> (remove ALLJEWELLERY to reply by e-mail)
>
>

Thanks, Simon. That sounds quite convincing. Whether it's the type of task
I'd take on is another matter!

--

Martin Sketchley | www.msketchley.pwp.blueyonder.co.uk
(remove ALLJEWELLERY to reply by e-mail)