Originally Posted by Ezrider

i figured id try to document what i did today as it may help someone diagnosing a problem with the convertible top motor or rear windows on a xjs convertible.

my project today was to basically wire a rear window switch to be able to roll up and down the rear windows. with some fluid leak problems and electrical issues in the convertible top controller. I just manually lift and lower my top witch is fairly easy when there is no fluid in the system. but still needed a way to raise and lower the rear windows. so this a temporary solution that will be just fine on a long term until the time i decide i want everything to function as intended.

now to understand a little about how this works basicly you have two relays per function

first two relays towards the front of the car power the drivers side rear window

middle two relays power the motor for the lift pump

last two relays control the passenger side rear window





they are wired as a pretty common reversible polarity circuit using relays. one motor wire off each relay of the pair both rest at - when one relay is triggered it puts + to that motor wire so the other relay in the pair does not need to be activated to energize the circuit

there are two wires you need to pay attention to on the relay

when the relays are clipped in place like the above picture closest to the pump motor and is the one that the lead runs a different direction than all the others, these are the motor leads. all the relays are orientated the same

the other post that you need to pay attention too is the post on the right hand side of the relays, this is your trigger lead, it triggers on ground so you ground that lead it energizes the relay.




if you take the relays and sockets loose so you can access the bottom turn them over so you can access the bottom with the relays plugged in you can take a grounded lead to the switch lead on the relay and if all your fuses are good you should be able to trigger the windows to go up and down, triggering one relay will make it go one way triggering the other relay of the pair will make it go the other way.

both windows will go up and down at the same time as these leads are interconnected in the harness

(the pump works exactly the same witch are the center two relays by the way)




the red lead is grounded in this photo btw not hot. these relays trigger on ground.

now because i was wiring in a window switch i un pinned the the switch wire from the connector and re pinned my own wires into the connector and they are basically daisy chained together so that i only have 2 wires coming out to control both windows (they will no longer interconnected after un pinning the harness until you connect the two single wires together.




next i just tidyed things up put a little peice of head shrink over the un-pinned leads, although they will only ever be ground its just a good precaution. zip ties and tied up




put the relays back in place (i accidentally saved over my original of this photo




i found a removable plug under the center console lid so i placed it there so i wouldn't have to drill any holes. basically ground the center lead of the 3 position switch then one way will be up the other way will be down, obviously you can wire your pump the same way if you so choose.







Where is this relay box located exactly? I can’t seem to find it anywhere.



i also could have pinned the switch into the convertible top switch on the ski slope but chose not to at this time, i may do that later on have not decided yet. i left the wires long enough to easily reach if i decide to do that.

i also did everything so it is easly reverable back to exactly how it was, no cut wire no holes drilled ect.

Originally Posted by ptjs1

cbpldc,

Possibly, but first check the integrity of the wires on the relay holder itself. Next I would try tapping the rear window motor with a screwdriver. Strangely, it sometimes seems to work. If you still have a problem, then I would apply current direct to the window motor terminals to eliminate any wiring problem.

Cheers

Paul