I have a 2000 jaguar xk8 the rear windows go up and down but the top will not unlatch to go down. I do not hear the pump turn on in the back after windows go down. Any and all help is appreciated. I do not know much about convertiable tops. But i do know a few years ago the lines were replaced and it worked fine till a few weeks ago and i cannot figure this out.

 

John,

I would first check to fuse protecting the pump motor. If it's blown, and blows again when replaced, don't panic; there is usually a cheap fix for this. See motor repair in my sig. line below.

 

John,

+1 to Dennis07. The hydraulic pump should be running once the quarter windows are down. Both the hood latch, above the windscreen, and the cylinder rams are hydraulic driven. So the 40A fuse in the trunk fusebox is a good place to start. As Dennis says it’s not a difficult problem to fix.

If it’s not the fuse, there are a number of wires to the pump. The big black/white one is the power connection. Should be secured or can work loose. Really easy to access to check. You know where it is? Pic below.


The blue/orange connectors on top of the pump are really brittle now with age and also break. Worth checking too.

It’s rare for hydraulic pumps to break 100percent. Normally it’s a wiring control problem.

 

thank you dennis and david i will check those out after work today and will give an update after i check it out.

 

My fuse box is not labeled so i could not figure out what fuse would be for the motor

 

John, are there any other 40amp fuses in there?

John

 

Just looked, there are not. Its the only 40 ampfuse in there.
John

 

I only see one 40 maybe im overlooking ??

 

Hi john,that's what I meant. The 40 amp fuse is for the convertible motion.
John

 

That 40 fuse is still good. And ive checked all the wires and connections for the on and around the pump all seem like they are connected good and none are loose in the connector. So what would my next step be?

 

Check the top down relay.

Link. http://www.jagrepair.com/HydSystemEvaluationXK8XKR.htm
This might help
Link.
http://www.jagrepair.com/images/Electrical/FuseRelayandRoadsideInfo/RoadsideFuseLocations.pdf

Gus
www.jagrepair.com

 

+1 to Gus.

Pic of the relays below.

 

I checked the relays they are all good. So relays and fuse are good so what would my next step be to figure this out?

 

John,

At this point I would test to see if the pump motor is alive.

Open the 2-wire connector leading to the pump ... the one with two thick wires, one black and one white. You want to apply battery voltage directly to the motor, just for an instant. Using test leads, connect the black wire side of the connector to chassis or battery ground, and then strike a test lead connected to the white wire side against the battery + terminal. If the pump is alive, you'll hear it react. Reverse polarity and try the test again if it works the first time (the pump has to work with both polarities).