All,

 

Looks like I have lost all things on the hatch lid,  Wiper motor, rear screen heater, number plate lights, opening hatch only by remote - this sort of points to a common earth problem.  Also stopped is the boot interior lights ( I have 12 v on both sides of the l/h bulb holder  as i think expected - so this at least points to the switch in the lock gone?)  Maybe the lock switch would stop the wiper motor from operating  - but not stop the boot lights - maybe I have two issues... can anyone help? 

just to be clear I have checked the earth connections on L/H side under carpet - I have 12v to the number plate lights - but earth seems to be open circuit between the boot light bulb holder and the earth point in boot

 

Check the main body earth connection behind the left hand side trim in the boot.

The connections will corrode if water collects there. Main cause is usually not using a strong enough windscreen washer solution in the winter. The water freezes in the pipe and the ice pushes the pipe off the connector. When you try to wash the rear screen. the water comes out of the pipe and collects near the earth connections.

 

 

yeh as i said on previous post all the earths on LH side under carpet look good -  There is a single earth coming down from the hatch -  that is on the chassis on the c pillar (just behind the rear seats)  with both pink and another plug/connector. 

 

Looking at wiring diagram the earth goes through a multiplug somewhere  in the bootlid before it comes out of hatch down to earth on c pillar - I guess that might be point of failure.  So im going to take the trim off bootlid tomorrow and see if anything obvious

just to let folks know it was the black plug inside the boot lid that carries the main brown earth wire - thanks to this diagram here that was really helpful. I suspect now the wiper motor was leaking fluid and this may have been running down the tube and got the connector wet. Quick squirt of contact cleaner and a re-seat of the plu and all electrics related to the boot working again. Well At least was - but looks now like my wiper motor packed up as its streaming fluid out of it...ive got one on order and will let folks know of the outcome