retractable roof wont....
#1
06-12-2014, 06:53 PM
retractable roof wont....
I have a 1996 jag xjs convertible today when i went to put the roof up there was no action. I had the switch checked it works, there is no fluid leak from the roof motor. when i hook power up to the motor the roof will go up and down. I checked the fuse next to the motor that was for the roof and it was good. Is there another fuse for the roof........ can anyone suggest any problem that i am missing...... thanks for any help
#2
06-12-2014, 07:29 PM
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DBarry (06-13-2014)
#3
06-13-2014, 05:00 AM
Veteran Member
Check through the systems thoroughly using the wiring diagram and description in the workshop manual. I'm not sure which "fuse" you're referring to, but the operation of the system is controlled through a series of relays controlling the up and down of rear windows and motor. The ecu looks for position signals from the handbrake and the transmission and then a signal from the roof switch. It then activates the rear window down relays and the roof relay. Read the description and wiring and then you'll logically work out if it's a position sensor, the roof switch or a relay. Possible but unlikely to be the roof ecu itself.
Good luck
Paul
Good luck
Paul
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DBarry (06-13-2014)
#4
06-13-2014, 05:29 AM
thank you for the suggestions
I have never had to engage the emergency brake to bring the roof up or down. car would have to be in park and foot on the break and then push the roof switch. Befor i bring it to a garage i wanted to shorten the fishing trip they would be on at $100 per hour. Thank you so much for your suggestions and any other you may be able to offer..... regards....db
#5
06-13-2014, 07:13 AM
Veteran Member
#6
06-13-2014, 11:07 AM
Veteran Member
db,
No XJS convertible was built with an electrical connection on the foot brake to operate the hood. They all take an electrical signal from the position of the hand brake.
It may be that the switch on the handbrake was not operating properly if you were previously able to operate the hood without applying the handbrake. Maybe the switch is now working correctly so you do have to apply the handbrake as specified.
I can't see why anyone would wire a switch into the foot brake for this purpose. Are you sure that you had to have the foot brake pressed to operate the hood previously? That sounds bizarre.
Are the windows operating when you press the hood switch? The wiring diagram is pretty clear on how the circuit and relays are linked. If you read through and then check power supply at the relay or even pin out the ecu, you'll identify the problem easily, I'm sure.
Good luck
Paul
No XJS convertible was built with an electrical connection on the foot brake to operate the hood. They all take an electrical signal from the position of the hand brake.
It may be that the switch on the handbrake was not operating properly if you were previously able to operate the hood without applying the handbrake. Maybe the switch is now working correctly so you do have to apply the handbrake as specified.
I can't see why anyone would wire a switch into the foot brake for this purpose. Are you sure that you had to have the foot brake pressed to operate the hood previously? That sounds bizarre.
Are the windows operating when you press the hood switch? The wiring diagram is pretty clear on how the circuit and relays are linked. If you read through and then check power supply at the relay or even pin out the ecu, you'll identify the problem easily, I'm sure.
Good luck
Paul
#7
06-17-2014, 04:32 PM
hey paul and Vee thanks very much for your reply...yes i have driven the car all last summer and this summer to date and the hood was engaged only when i had the foot on the brake and in park... I will try the hand brake for sure now... paul u mentioned the The wiring diagram .... where could i find that.... i would give that to the garage . I put the roof up manually and the back windows are down and this was as per the owners manual... I checked the fuse and its ok..... kind of stuck now
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#8
06-17-2014, 04:49 PM
Veteran Member
DBarry,
The wiring diagram is in the Parts and Service Manual dvd.
As mentioned, the foootbrake has no link to the hood mechanism.
Do the windows go up if you press the roof switch to the up position for more than 8 seconds? If so, then this would possibly imply that the fault is in the hood up relay. If the windows don't go up after 8 seconds then that still sounds like roof switch or transmission selector switch or handbrake switch. How do you know that that the hood switch is working ok?
Hope that helps.
Paul
The wiring diagram is in the Parts and Service Manual dvd.
As mentioned, the foootbrake has no link to the hood mechanism.
Do the windows go up if you press the roof switch to the up position for more than 8 seconds? If so, then this would possibly imply that the fault is in the hood up relay. If the windows don't go up after 8 seconds then that still sounds like roof switch or transmission selector switch or handbrake switch. How do you know that that the hood switch is working ok?
Hope that helps.
Paul
#9
06-19-2014, 05:25 AM
retractable roof
where would i find a copy of this dvd now... i do not have one.... it seems like there is a break in the wire from the battery
Do the windows go up if you press the roof switch to the up position for more than 8 seconds? to the switch.>>>>>> no they stay down. I changed over the swithch to operate the windows and it worked..... the roof switch and the window swithch are interchangable.....
Do the windows go up if you press the roof switch to the up position for more than 8 seconds? to the switch.>>>>>> no they stay down. I changed over the swithch to operate the windows and it worked..... the roof switch and the window swithch are interchangable.....
#10
06-19-2014, 06:09 AM
Veteran Member
Dbarry,
The Parts & Service manual is available from Jaguar Heritage. See here:
Jaguar Heritage. Technical Publications
When I said do the windows go up if you press the hood switch for more than 8 seconds, I meant the rear windows. As you will see from the workshop manual, the ecu powers the hood up then after an 8 second delay, it powers up the rear windows. So what you seem to have ascertained is:
- the hood switch works (you swapped it with the front window switch and the front window worked?)
- the hood motor works as you've applied current directly to it and it works.
- the rear windows don't work if you hold the hood switch down for more than 8 seconds
That would seem to imply either:
- the hood ecu has failed (not a common occurence)
- all the hood and rear window relays have failed simultaneously (extremely unlikely they'd all go at the same time)
- the ecu is not getting the signals from the transmission and handbrake switches to power the roof and windows (very likely that it's the handbrake switch)
The fact that the windows and roof both don't work does seem to imply that the fault is not "after" the ecu, it's "before the ecu. I would:
- Try putting the transmission in Neutral rather than Park just to eliminate a false Park position on the switch
Then look at the handbrake switch. That's where my money would be based on your description of what works and what doesn't.
Good luck
Paul
The Parts & Service manual is available from Jaguar Heritage. See here:
Jaguar Heritage. Technical Publications
When I said do the windows go up if you press the hood switch for more than 8 seconds, I meant the rear windows. As you will see from the workshop manual, the ecu powers the hood up then after an 8 second delay, it powers up the rear windows. So what you seem to have ascertained is:
- the hood switch works (you swapped it with the front window switch and the front window worked?)
- the hood motor works as you've applied current directly to it and it works.
- the rear windows don't work if you hold the hood switch down for more than 8 seconds
That would seem to imply either:
- the hood ecu has failed (not a common occurence)
- all the hood and rear window relays have failed simultaneously (extremely unlikely they'd all go at the same time)
- the ecu is not getting the signals from the transmission and handbrake switches to power the roof and windows (very likely that it's the handbrake switch)
The fact that the windows and roof both don't work does seem to imply that the fault is not "after" the ecu, it's "before the ecu. I would:
- Try putting the transmission in Neutral rather than Park just to eliminate a false Park position on the switch
Then look at the handbrake switch. That's where my money would be based on your description of what works and what doesn't.
Good luck
Paul
#11
06-19-2014, 11:10 AM
Senior Member
A year an a half ago I got tired of fooling with the roof and rear windows not working or working only when they wanted to and unplugged the roof module. Then I wired the roof switch to either raise the hood or lower it when pushed. I wired the windows/down relays to a toggle switch on the ski slope to raise the windows or lower the windows at will. Works every time. This lets me drive with the roof down and the rear windows up if I wish.
This problem is probably coming from the park brake switch as ptjs1 said.
Luck, RagJag
This problem is probably coming from the park brake switch as ptjs1 said.
Luck, RagJag
#12
06-19-2014, 12:47 PM
OP
If you remove the drivers seat you will have 100% access to the handbrake mechanism. Picture attached. Micro switch vertically oriented white oblong on left of mechanism with diagonal metal bar and two screws holding it on. Should be easy to check if its working electrically and/or if its properly aligned. Taking out the seat is easy, just watch for the, I think two, electrical plugs. Good luck! Normally you find a small fortune under these seats easily covering the price of a new switch.
If you remove the drivers seat you will have 100% access to the handbrake mechanism. Picture attached. Micro switch vertically oriented white oblong on left of mechanism with diagonal metal bar and two screws holding it on. Should be easy to check if its working electrically and/or if its properly aligned. Taking out the seat is easy, just watch for the, I think two, electrical plugs. Good luck! Normally you find a small fortune under these seats easily covering the price of a new switch.
#13
06-19-2014, 07:24 PM
dbarry,
the parts & service manual is available from jaguar heritage. See here:
jaguar heritage. Technical publications
when i said do the windows go up if you press the hood switch for more than 8 seconds, i meant the rear windows. As you will see from the workshop manual, the ecu powers the hood up then after an 8 second delay, it powers up the rear windows. So what you seem to have ascertained is:
- the hood switch works (you swapped it with the front window switch and the front window worked?) yes
- the hood motor works as you've applied current directly to it and it works. Yes
- the rear windows don't work if you hold the hood switch down for more than 8 seconds yes
that would seem to imply either:
- the hood ecu has failed (not a common occurence)
- all the hood and rear window relays have failed simultaneously (extremely unlikely they'd all go at the same time)
- the ecu is not getting the signals from the transmission and handbrake switches to power the roof and windows (very likely that it's the handbrake switch)
the fact that the windows and roof both don't work does seem to imply that the fault is not "after" the ecu, it's "before the ecu. I would:
- try putting the transmission in neutral rather than park just to eliminate a false park position on the switch
then look at the handbrake switch. That's where my money would be based on your description of what works and what doesn't.
Good luck
paul
the parts & service manual is available from jaguar heritage. See here:
jaguar heritage. Technical publications
when i said do the windows go up if you press the hood switch for more than 8 seconds, i meant the rear windows. As you will see from the workshop manual, the ecu powers the hood up then after an 8 second delay, it powers up the rear windows. So what you seem to have ascertained is:
- the hood switch works (you swapped it with the front window switch and the front window worked?) yes
- the hood motor works as you've applied current directly to it and it works. Yes
- the rear windows don't work if you hold the hood switch down for more than 8 seconds yes
that would seem to imply either:
- the hood ecu has failed (not a common occurence)
- all the hood and rear window relays have failed simultaneously (extremely unlikely they'd all go at the same time)
- the ecu is not getting the signals from the transmission and handbrake switches to power the roof and windows (very likely that it's the handbrake switch)
the fact that the windows and roof both don't work does seem to imply that the fault is not "after" the ecu, it's "before the ecu. I would:
- try putting the transmission in neutral rather than park just to eliminate a false park position on the switch
then look at the handbrake switch. That's where my money would be based on your description of what works and what doesn't.
Good luck
paul
#14
06-19-2014, 07:34 PM
#15
06-19-2014, 08:50 PM
Sea Cat
Hey guys, Must be the moon affecting these Xjs's. I have a similar problem, hood goes up and down, driver and passenger windows go up and down, the passenger rear window goes up and down but the driver rear window does not go up or down. Fuses are good, up and down relays are good, NOT getting power to the up and down relays. Seems like that circuit is open. Is there another fuse in that line? This is for a 1994 XJS w/ 112,000 miles. Stunned--Any help would be appreciated. Many Thanks, Louis
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