Early Cerb window microswitch missing

[plasticman]

I have bought a 96 Cerbera which was partially dismantled and now I find there are other parts missing . I noticed there was no window microswitch when I removed the door card . On closer inspection I cannot find any wiring on the door loom that goes to the switch . My question is are the early cars fitted with the microswitch ?

[spitfire4v8]

They don't have one .. the limit of window drop from the door opener is done on a timer in the control box chip.

[plasticman]

The contol box ( MEO154 )I have in the car is dated 2001 so will probably not have that timer . Is there a way of identifying a correct box ?

[Byker28i]

spitfire4v8 said:

They don't have one .. the limit of window drop from the door opener is done on a timer in the control box chip.

How does that work when the window slows down - dirty motor, window runner etc?

[ukkid35]

Byker28i said:

How does that work when the window slows down - dirty motor, window runner etc?

It doesn't

[ukkid35]

plasticman said:

I have bought a 96 Cerbera which was partially dismantled and now I find there are other parts missing.

Are you breaking or restoring?

I will definitely get back to you about a door repair I hope to get done one day, thanks again for your advice

[Penelope Stopit]

Chances are you have this, may help with checking through or modifying

U/Y Blue/Yellow from RH door window limit switch to Door control ECU Pin B2 RH window position

Taken from here http://www.tvr-cerbera.co.uk/WorkshopWiringDiagram...

http://www.tvr-cerbera.co.uk/WorkshopWiringDiagram...

http://www.tvr-cerbera.co.uk/wiringdiagrams.html

Edited by Penelope Stopit on Tuesday 21st April 09:57

[Byker28i]

ukkid35 said:

Byker28i said:

How does that work when the window slows down - dirty motor, window runner etc?

It doesn't

[FarmyardPants]

Byker28i said:

ukkid35 said:

Byker28i said:

How does that work when the window slows down - dirty motor, window runner etc?

It doesn't

Going down is usually not a problem, it’s going up that’s the issue (which the microswitch can’t help with). We need another switch at the bottom to sense when the window is up, instead of a timer.

[plasticman]

I bought the car to restore . It came with the engine out and partly dismantled and various parts missing . The head was missing from the engine but another was supplied .
Those diagrams were useful but not easy for me to read but did find my own copies during the day .I did manage to trace the wires through the car but they were not the stated colours or going through the stated connectors but if I swap the door looms I think I should be able to get it working with the later control box , Thanks .

[Penelope Stopit]

Nice

Those diagrams are big

[spitfire4v8]

FarmyardPants said:

Byker28i said:

ukkid35 said:

Byker28i said:

How does that work when the window slows down - dirty motor, window runner etc?

It doesn't

Going down is usually not a problem, it’s going up that’s the issue (which the microswitch can’t help with). We need another switch at the bottom to sense when the window is up, instead of a timer.

Someone clever could probably re-write the code but I used to do a mod which helped. I used to wire in a resistor in series with the power to the motor and a diode in parallel with the resistor .. going down the motor would receive a lower voltage as the power was diverted through the resistor so it's descend speed would be reduced, going up it would receive full power as it was diverted through the diode (minus any drop across the diode - I actually used 2 diodes in parallel to reduce any drops) so it's ascend speed was virtually normal.

worked a treat.

Edited by spitfire4v8 on Wednesday 22 April 08:25

[FarmyardPants]

Clever!

[Penelope Stopit]

spitfire4v8 said:

FarmyardPants said:

Byker28i said:

ukkid35 said:

Byker28i said:

How does that work when the window slows down - dirty motor, window runner etc?

It doesn't

Going down is usually not a problem, it’s going up that’s the issue (which the microswitch can’t help with). We need another switch at the bottom to sense when the window is up, instead of a timer.

Someone clever could probably re-write the code but I used to do a mod which helped. I used to wire in a resistor in series with the power to the motor and a diode in parallel with the resistor .. going down the motor would receive a lower voltage as the power was diverted through the resistor so it's descend speed would be reduced, going up it would receive full power as it was diverted through the diode (minus any drop across the diode - I actually used 2 diodes in parallel to reduce any drops) so it's ascend speed was virtually normal.

worked a treat.

No offence meant

Why didn't you use a relay to achieve the same result without a volt-drop across diodes

Think I know the answer though.....You didn't think to use a relay???

Interested, that's all

[spitfire4v8]

Penelope Stopit said:

No offence meant

Why didn't you use a relay to achieve the same result without a volt-drop across diodes

Think I know the answer though.....You didn't think to use a relay???

Interested, that's all

No offence taken .. I didn't think to use a relay you're exactly right! In fact I can't picture right now how I would wire a relay in to the window motor circuit to help .. I need to sit down and draw it out. The resistor/diode circuit is easy to picture and implement that's all

[Penelope Stopit]

spitfire4v8 said:

Penelope Stopit said:

No offence meant

Why didn't you use a relay to achieve the same result without a volt-drop across diodes

Think I know the answer though.....You didn't think to use a relay???

Interested, that's all

No offence taken .. I didn't think to use a relay you're exactly right! In fact I can't picture right now how I would wire a relay in to the window motor circuit to help .. I need to sit down and draw it out. The resistor/diode circuit is easy to picture and implement that's all

Ok then, much appreciated

Did like your idea of a diode

Don't know if this will wire into the circuit, you'll know

[spitfire4v8]

That looks like it should work

I am running the resistor and diode system on my Tuscan because of a fault with the early version door control unit so will try the relay version on that at some point. It won't be for a while though, the Tuscan has a head gasket issue and I've fallen out of love with it right now as taking the engine out yet again isn't high on my priority list at the moment ...

[Penelope Stopit]

Ok then

Keep well