Heated rear window problem

Here's an odd one.

As per another thread I have fitted an MGFmania rear window and wired up the heated rear screen.

SWMBO headed off to work today but the heated rear window would not switch off - even after the ignition was switched off. Result one flat battery.
So I've removed the relay which was pretty hot but clearly need to get this fixed. Any suggestions?

Cheers

Could be faulty switch, the relay or the wiring has been altered. The trigger feed to the relay should only work on ign 2 position.

And the Heated Rear window won't work (or should not) without the engine running, Like David, I suggest a faulty relay

The power feed to energise the relay coil and the power supply of the relay are a common feed from F7 in the fusebox of the drivers footwell, F7 is feed from the underbonnet link 5&6 via the ignition switch so if the ignition switch is off F7 has no supply, so the HRW relay will not be powered.

Put the relay back in start the engine, switch on the HRW then pull F7, the HRW relay should de-energise, the HRW switch illumination should go out.

I think you have an incorrect feed from somewhere, there must also be a switch ground issue, as when the engine is not running the BCU takes the ground signal away from the HRW relay coil; so there are 2 problems to check, the power supply feed and ground signal.

PM me if the want the HRW wiring diagram page for (>MY03 MGTF)

Brian.

Thanks for the replies I'll check out the relay etc

I just fix this problem on my car last week check out this post about it

http://www.the-t-bar.com/forum/68-the-t-bar/91294-hard-top-heated-window-light-on-all-the-time

sounds like the same thing as mine hope this helps its easy to do just undo two nuts holding fuse board in and turn around clip out two leads and swop box.

This fault was draining my battery you might want to pull the fuse until you get it fixed.

MGF, MG TF, ZR ,ZS Multi Function Relay Unit YWC104500 Completed

sherwood0_8 wrote: I just fix this problem on my car last week check out this post about it

http://www.the-t-bar.com/forum/68-the-t-bar/91294-hard-top-heated-window-light-on-all-the-time

sounds like the same thing as mine hope this helps its easy to do just undo two nuts holding fuse board in and turn around clip out two leads and swop box.

This fault was draining my battery you might want to pull the fuse until you get it fixed.

MGF, MG TF, ZR ,ZS Multi Function Relay Unit YWC104500

Completed

It's a different system with different control components on a MGF to the TF.

But very good information for the MGF owners on the T Bar.

The heated rear window should only work when the oil pressure light goes out, it is wired that way so it only works with a running engine.

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