Puzzling sunblind

[Raistlin]

I've just gained an electric rear sunblind in The Princess but can't find a suitable overhead console with which to switch it.

The wiring diagrams suggest a simple SPST switch with the up / down cycling being done within the motor assembly.

I wired in  just such a switch but the sunshade doesn't react to it. Not even a click. I know the sunshade is serviceable as I saw it raise and lower in the donor car, which leads me to my question.

Does anybody know whether the wiring diagram is correct, or does the switching in the overhead console do more than the simple SPST switch would suggest?

 

Thanks :)

[Old_Growler]

9 hours ago, Raistlin said:

I've just gained an electric rear sunblind in The Princess but can't find a suitable overhead console with which to switch it.

The wiring diagrams suggest a simple SPST switch with the up / down cycling being done within the motor assembly.

I wired in  just such a switch but the sunshade doesn't react to it. Not even a click. I know the sunshade is serviceable as I saw it raise and lower in the donor car, which leads me to my question.

Does anybody know whether the wiring diagram is correct, or does the switching in the overhead console do more than the simple SPST switch would suggest?

 

Thanks :)

I would have thought a spring loaded release and return to center off position SPDT switch if power was needed to rise and lower the blind? If it has 2 wires from the motor both would be power in and the motor fixed to metal would act as the return.

[fatcat1955]

My blind is operated by a push to make switch next to the parking sensor switch in the overhead console.  I would have thought that the supply would go direct to the blind via a relay which is operated by the switch.

[Raistlin]

4 hours ago, Old_Growler said:

I would have thought a spring loaded release and return to center off position SPDT switch if power was needed to rise and lower the blind? If it has 2 wires from the motor both would be power in and the motor fixed to metal would act as the return.

That would certainly be a method of operation Paul but according to the wiring diagram, the switch in the overhead console merely applies a 12 volt supply direct to the blind.

That made me think that the control circuitry would be in the motor assembly, requiring a 12 volt momentary pulse and cycling either upwards or downwards as required.

@ Garry: There is no discrete relay shown in the wiring diagram which is why I expected at least a click from the vicinity of the parcel shelf, ie. within the motor assembly itself, because the wiring from the overhead console is not of sufficient capacity to handle the motor current I'd have thought. There is a separate 12 volt supply to the motor as well, according to the diagram.

I'm hoping to temporarily fit Denis' overhead console today (which has the switch) so should have a clearer picture later.

[JOE-DOT-COM]

Hi Paul

the switch is actually there in the over head light

but the front facia button is missing

I took my overhead light apart a while ago when i added the garage opener board and front buttons

when i took it apart all the board buttons are there,

I used a donor light just for the button, because i could not find a light the same color

it does look like a simple switch and a  12v to the blind

it looks very easy to test on the bench, put 12v and earth to the blind, and apply 12v to the other connection to open, remove and it should close

[Raistlin]

Thanks Joe.

In fact, the switch isn't on my overhead unit PCB. It is something of a mongrel as it was modified to include the Homelink buttons and transmitter. The PCB I got with the Homelink buttons on only had the one additional switch for the powerblind, which at the time I didn't have, rather than the switch for the parking sensors which I did have at that time.

If I could find an appropriate overhead cover, I could re-solder a SMD switch into place. The problem is finding an overhead unit with the split switch for both powerblind and parking sensors.

IF the switch works as it shows in the wiring then the simple push button spring loaded switch I fitted in the sunglasses recess and spliced into the wiring as per the diagram you have included above would be perfectly adequate against the day that I can find precisely the right overhead unit

The switch is concealed maintaining the OEM look but still easily accessible as I never have sunglasses in the receptacle.

The appropriate unit is available occasionally but only from the USA, where not only would you pay a basic price of approximately £70 to £90, but would also have to pay the extortionate fleabay "import charges". I priced it up recently and the cost went from £75 including standard shipping to £168 when factoring in fleabay's "import charges"

[JOE-DOT-COM]

hi

i got mine off feabay, there's that many combinations and colors

its really hard to drop on one, exactly as you need it,

mine had all the switches all there on the board, i just swapped the small panel, with the 3 homelink buttons in it and added the plug in module

cheers

Joe

 

 

 

 

[Raistlin]

Denis is in contact with somebody in the US on the Facebook Jaguar page so I might be able to get the right version.

Tested with Denis' overhead console today and it works fine so clearly, the circuit diagram doesn't tell the whole story.

[Old_Growler]

9 hours ago, Raistlin said:

That would certainly be a method of operation Paul but according to the wiring diagram, the switch in the overhead console merely applies a 12 volt supply direct to the blind.

That made me think that the control circuitry would be in the motor assembly, requiring a 12 volt momentary pulse and cycling either upwards or downwards as required.

@ Garry: There is no discrete relay shown in the wiring diagram which is why I expected at least a click from the vicinity of the parcel shelf, ie. within the motor assembly itself, because the wiring from the overhead console is not of sufficient capacity to handle the motor current I'd have thought. There is a separate 12 volt supply to the motor as well, according to the diagram.

I'm hoping to temporarily fit Denis' overhead console today (which has the switch) so should have a clearer picture later.

Maybe my idea was to old school I was working on the theory that it operated the same as a fabric sunroof I had on a Mk2. It could also operated like the old style semi auto radio antenna? 1 permanent feed and 1 push feed switch to go up or down

[ay_jay]

Just a thought but are you sure the switch connects the motor to a live feed rather than ground?

[Raistlin]

4 hours ago, ay_jay said:

Just a thought but are you sure the switch connects the motor to a live feed rather than ground?

Definitely 12 volts Tony.

[Raistlin]

OK. Good news to impart

Denis found an overhead console for not a lot on fleabay here in the UK (no ridiculous import fees) It's from an XJ, is the wrong colour and doesn't have Homelink.

BUT, it does have the parking sensor disable / sun blind switch so, with a little judicious modification of the plastic sub-assembly and some re-work ofthe PCB, I'm going to end up with precisely the specification i want by dropping the modified components into my car's casing which is, of course, the correct colour

It has taken a while but I got there in the end