Rear light cluster issue t6.1

[Dv1987]

Hi I’m after some help with an issue i have with my rear lights.
All working except both high level, and passenger break/sidelight.

There is no bulb fault on dash.

Checked fuses.

I’ve got no power to the junction under passenger seat so have now gone to J419 relay for break lights which according to the relay diagrams should be in position 7 however there’s nothing there?

I’m now at loss as not sure where to test from here!

I’ve attached a picture of my relay box.

Hopefully someone can point me in right direction?
Cheers

 

[Dv1987]

 

[TheGrapeEscape]

Not the same van, but i had EXACTLY the same issue with my old work van, a Renault kangoo.

At first, I thought "it's just a renault" so accepted my fate that it wouldnt be fixed. How I discovered my fault, was it failed the mot on left light, reg plate light and top brake light wasn't working (unknown to me as no warning light on dash)

After a little fiddling, I found that the bulb holder in my reg plate light was corroded, causing a short circuit to the other lights. I now know that the power went from right light to reg playe. To left light to top brake light. As soon as I unplugged this corroded plug in the reg plate, the lights all came on and worked! I replaced the bulb holder for a new one, all fixed.