Thread: D2 rear windows not working

Shane
Check the child proof switch on the central window winder control panel isn't disconnected/wiring damaged.

Bob

Originally Posted by Roberto

Shane
Check the child proof switch on the central window winder control panel isn't disconnected/wiring damaged.

Bob

Cheers Rob. Checked this. Not sure if this only disconnects the rear switches or not. But i cannot get the windows to operate using any rear window switch.

Weird voltages on the console switches. This includes the functioning front ones. No more than 1V on the working front windows. The rear less than 0.5V on the console switches. The rear door switches have O Volts on them.

No mater what switch i use the rear motor has 0V on it.

So this leads me to believe there is an issue with some control module for the rear windows. Unless there is some strange fuse somewhere that is blown, obviously not the power window fuses, i've check these

Where can i find this magic box of electronics? I need to fill it up with some more magic electrical smoke.

hmmm.....I too have problems. First time I noticed rear windows not working the rear circuit fuse had blown. They lasted a few days then kids said they stopped again. Haven't yet checked it out but I'd be interested in hearing what you've found....or I'll let you know what I found if I get to it first...


Cheers, Jayden

I've pulled out the BCU. De-soldered the relays from the PCB to test. The relays work fine. They are a dual package relays setup with a H-Bridge. Basically all that means is they are a dual package relay setup specifically to run motors, they can use this configuration to reverse the polarity on the motor to make it drive up or down in the case of electric windows.

I would have much rather found these relays were latched or had open circuit coils. I would have replaced them and be confident the windows would operate.

But now I will have to re-solder all the connections and hope for the best.

I'll let you know how I go.

Originally Posted by Jazzman

I've pulled out the BCU. De-soldered the relays from the PCB to test. The relays work fine. They are a dual package relays setup with a H-Bridge. Basically all that means is they are a dual package relay setup specifically to run motors, they can use this configuration to reverse the polarity on the motor to make it drive up or down in the case of electric windows.

I would have much rather found these relays were latched or had open circuit coils. I would have replaced them and be confident the windows would operate.

But now I will have to re-solder all the connections and hope for the best.

I'll let you know how I go.

Like I said before time to re-negotiate LOL

No joy. Still no rear window function. I'm nearly ready to bypass it all and wire up 2 motor controllers from work.

OK I think I've worked it out. Block 7 rear relay will be my issue i believe. I'll check tomorrow, but this better be it.

Land Rover Workshop Manuals > Discovery II > WINDOWS > DESCRIPTION AND OPERATION > Electric windows block diagram