Electrical window problem

I just need some advice. The back windows won't go down at all. The switches on the door and the switiches on the centre console don't make the windows move at all. Never has in the year and half that I have owned it. It is a 1994 Landrover discovery 3.9 V8. I have been told that it is a whole new motor behind the dash, but the front ones work>Wouldn't they run off the same motor? As you can tell from my last post, I don't like listening to my mechanic.

Any advice on what to do? Maybe a process of elimination to figure out why they don't go?

Many thanks

I would start with checking fuses, and then look to see if the child/isolator switch is faulty, be rare if both went together, but without knowing the history maybe they didn't.

i had this problem just after i bought mine took it back to the garage and all they did was spray some silicon on the window rubbers apparently sometimes they perish and stick
had no probs since

You sound slightly confised about the motors, firstly there is a moter in each door to run each window,

If two are not working which happen to be the back ones, either they gave not been used and are stuck as Richy says or the common part as L3on says is the chil lock switch. The center switch pannel is easy to take out to look at, take a look there.

2 motors, both on back doors not working, nah no way.

I iant having it that BOTH motors have gone, whats the odds on that, even on a Disco.

Switches, get full of dust and stop them working, have you tried them from front and back switches, with child lock on and off???

OK., We have taken the switches from the front windows (that go) and put them on the back and nothing happens. Where is this child lock thing? Do i take the door panel off to find the motors or are they behind the heater on the dash?

The child lock switch is the smaller one in between all the window switches, you should have a switch for each window, and one spare. Thats the child one.


The motors are in the doors.

Did you put the switches from the FRONT windows onto the rear door switches, or the centre switches beside handbrake???

Put them on the switches on the centre switches beside the handbrake. When we put the BACK switches on the FRONT they worked. We could all the switches to go on the FRONT windows, but the BACK windows didn't move at all.

Ok, so its not switch related, which is common problem.

Im pretty good at these bits, so i would go for the motors and work on assumption lack of use means seized/stuck.

Take off door panels and spray the runners up the sides with a good lubricator, as well as the motors. Then let engine run and keep trying the switches, even a very gentle tap with a blunt object may help.

Again this is a fairly common thing and nothing to worry about.

There is no noise coming from the motors at all, whcih gave us the thought that there is no power going there at all. Could there be a wiring problem somewhere? Is there an online wiring diagram we could refer to? Also, has anyone ever heard of there being control box for the windows behind the dash? An electrical business reckoned there could be, but we don't fancy taking of the dash if no-ones thinks that there is.

Not familiar with that particular vehicle, but later models have a separate fuse and relay for the rear window circuit (under dash). Have you checked for voltage / earth at the switch feeds? either centre console or on doors? And then again for feed and earth at the motors? Does yours have one-touch donw on front windows? if so you can't test rear windows with front switches anyway.
Try running test leads of direct power to the switches to test them.

< Do i take the door panel off to find the motors or are they behind the heater on the dash?>


They are in the doors, how can a motor that spins contpole somethting that moves on a door that is hunged without loads of very complicated gearing mecanisums.

Before you start pulling doors apart, you havent mentioned whether you have checked your child switch or not on the centre console at your elbow.

I have to agree that no power to the window motors means that its not the doors. I would check current to the child switch or even run a separate powered wire short time to the door switches to see if thats the problem.

My old Rover SD1 had this problem and I bypassed the child lock switch and rear windows worked a treat.

Disco wired so even with child lock engaged front window switches will still open rear windows though.

i would check that power is getting to the motors with a circuit tester first if so, then lubricate the runners to make sure the glass aint stuck to it. as has been said before the windows will work with the child locks on so that eliminatres that for a start

Hi,
I had this problem with my 1998 Tdi ended up trying all of the above but in the end it tuned out to be the window lift ecu that is located behind the glove box.(managed to get a new one from ebay for £5)

Trevor.

I have just cured the same problem rear windows would work found out it was the ecu there were two diodes gone open circuit when repaired all working fine now

Good to hear you sorted the windows I have been informed this is a common fault with Discovery's.

Trevor.