My son's D2 has a driver side rear door window and lock that works intermittently -- but more often doesn't work than it does.

I was assuming that we had a harness issue in the area between the door and the body (wires fatiguing thru open/close cycle), so we took off the door and B-pillar panels and tested the continuity of every wire that goes thru that protective rubber boot from connector to connector and found them to all be working.

I find it hard to believe that both the lock mechanism and the window lift motor in that door would BOTH be going bad at the same time, so my next guess is that maybe there is a ground block in the door somewhere that grounds both systems.

I looked at the ground point diagram in the manual (RAVS?), and it doesn't show any ground point in the doors, so I am at loss at what to try next.

Any ideas out there?

 

Look at the wiring diagram and see where they both ground out.

 

The only diagram that shows the ground points is the one in the electrical library pdf (page 30) and it doesn't show any ground in the door.

There are no other wiring diagrams in that manual -- though it is 700+ pages.

As the harnesses to the door don't appear to have any (obvious) ground wire (though the harness for the audio speakers does), I am guessing that both the lock mechanism and the window lift motor uses a common body ground.

Does anyone know if this is the case, and if so, where I can find that ground point.

 

Should be a common ground. If common sense would prevail (I know it's a land rover) it may be somewhere near the right front floor board. (C0018, C0910) on the diagram

 

Maybe they ARE both going bad? It is a Land Rover after all... They're not exactly know for quality. At least not LASTING quality!

 

I believe the window motor power and ground wiring changes to raise and lower the motor, (reversing power and ground) so I would guess they are not related. Door locks probably work the same way. maybe a relay or a circuit board??