Disco blues

[OJCar]

Difference between the 200TDi and what, OJ?

The other engines of the same period as the 200TDi as AKN said. (V8 and MPi)




Left side of the page is the electric windows for your model.

 

[Prajna]

The other engines of the same period as the 200TDi as AKN said. (V8 and MPi)


View attachment 359793

Left side of the page is the electric windows for your model.

That's the kind of thing, @OJCar. Not so sure about the cable colours though. From memory the lift motors use SK, SU (lhs) and SR, SK (rhs).

As @AKN said, I might have to invest in a workshop manual. Costs enough for tools without having to fork out for manuals! I'm doing some bits on a 2007 Honda CRV III too and no poxy wiring diagrams for that either. Thanks all for your help.

 

[OJCar]

On my 1990 3 Door

Left Front switch


Right Front switch



Wiring for the other three switches for the 5 door set up is present but not connected.

 

[Prajna]

On my 1990 3 Door

Left Front switch
View attachment 359804

Right Front switch
View attachment 359805


Wiring for the other three switches for the 5 door set up is present but not connected.

Yup. That's wot I got. Wiring there for the (non existing) back doors plus a few more connectors - back window perhaps? - and a further smaller connector for something floating round in the centre console.

Wanna go up and get the landy again so I can take another gander.

 

[Prajna]

I guess the next thing I should do is to test the switches again but more thoroughly this time. Probably I didn't check the earths last time.

 

[dobbslc]

Looking at the diagram both drivers and rear door switch sets go back to the rear window relay 102 and there's a rear window isolator switch to look at too 101. If you have power to the relay and both sets of switches don't work I'd try swapping the front / rear window relays over to see if the rear one has failed.

 

[Prajna]

Looking at the diagram both drivers and rear door switch sets go back to the rear window relay 102 and there's a rear window isolator switch to look at too 101. If you have power to the relay and both sets of switches don't work I'd try swapping the front / rear window relays over to see if the rear one has failed.

Where do I find the islator switch 101 and relay 102? That certainly sounds like the things I should be looking at.

 

[OJCar]

On a 3 door the rear door relay (102) and the three rear door window switches (99 100 101 ) are not fitted.

 

[Prajna]

On a 3 door the rear door relay (102) and the three rear door window switches (99 100 101 ) are not fitted.

But the connectors for the switches are fitted. I wonder why there would be a rear door relay but no front door relays.

 

[OJCar]

There is, item 103.

 

[Prajna]

There is, item 103.

Ah, where do I find that then? I seem to remember an earlier reply said there was no relay for the windows. If there is then that would seem like an obvious thing to check. [goes back to reread the thread...]

 

[Prajna]

It is not normal to put relay in window circuit other than the ecu for one touch down.

 

[OJCar]

This is a 200TDi Discovery, there aren't any ECUs.

Relay 103 will be in one of the footwells, you may well find that there is no relay in the socket, just jumper cables

 

[Prajna]

Relay 103 must be working since I have power at the switch. I was thinking that the switch may switch a relay for the motor but it seems the relay is switched by the ignition key. Has to be the wire between the window switch and the connector in the door pillar. But why fail on both windows?

 

[Prajna]

This is a 200TDi Discovery, there aren't any ECUs.

Relay 103 will be in one of the footwells, you may well find that there is no relay in the socket, just jumper cables

The manual doesn't give any hints about where amongst the bevy of relays in the footwells relay 103 lives? Anyway, I'm pretty sure it's not my problem.

 

[OJCar]

Not necessarily.
If the earth on switches 95 & 96 is bad you will get the same effect.
From memory the earth is on the rear of the console mounting bolts.

 

[AKN]

Sorry for misinformation I was speaking from more general experience. I’ll agree with the circuit diagram, however the fact that you have 12V approx at the switch when operating the window suggests the relay is ok. If you had much lower voltage then I would suspect it.

I was thinking that the switch may switch a relay for the motor but it seems the relay is switched by the ignition key.

This is along the line I was thinking when I made the original post. These relays 102 and 103 are really only power switches to limit the current that passes through the ignition switch. On your 3 door the rear relay will not be fitted bu an empty socket will be there just like you have the connections for the 3 rear window switches but no switches. Third switch is to isolate the rear door mounted window switches to prevent children (or adults behaving like children) from operating the windows inappropriately.

Not necessarily.
If the earth on switches 95 & 96 is bad you will get the same effect.
From memory the earth is on the rear of the console mounting bolts.

Have you tried removing a switch and applying a known good +12V and Earth to the Grey wires in the switch connector? You will probably have to try reversing them to see if the motor moves. If it does then the fault is either the switch or as OJCar says the earth connection.

 

[Prajna]

Sorry for misinformation I was speaking from more general experience. I’ll agree with the circuit diagram, however the fact that you have 12V approx at the switch when operating the window suggests the relay is ok. If you had much lower voltage then I would suspect it.


This is along the line I was thinking when I made the original post. These relays 102 and 103 are really only power switches to limit the current that passes through the ignition switch. On your 3 door the rear relay will not be fitted bu an empty socket will be there just like you have the connections for the 3 rear window switches but no switches. Third switch is to isolate the rear door mounted window switches to prevent children (or adults behaving like children) from operating the windows inappropriately.


Have you tried removing a switch and applying a known good +12V and Earth to the Grey wires in the switch connector? You will probably have to try reversing them to see if the motor moves. If it does then the fault is either the switch or as OJCar says the earth connection.

Thanks AKN. Good suggestion to try 12v at the switches. I'll check earths too.

 

[dobbslc]

On a 3 door the rear door relay (102) and the three rear door window switches (99 100 101 ) are not fitted.

Ignore my ramblings, I had it in my head it was the rear windows that weren't working

 

[Prajna]

A little update: had my hands on the Disco again today. I can run the windows by powering at the switch connector in the centre console, so all wiring between there and the lift motors gotta be good. That tells me the problem has to either be ground connection for the switches (most likely) or a connector/fuse/wire on the power side to the switch. I do get 12v at the switch but it could be the fuse (which tests ok) is hanging on by a thread and passes volts but insufficient current. When I get the Disco back I'll try running a known good ground wire to the switch and see if things start working.