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Window/PRHT

1045 Views 6 Replies 4 Participants Last post by  djrose007
Don't know if this has been covered elsewhere but;

For the first time in over 13 years I have a problem with my Mk3 PRHT.

I went out this morning to pick up some medication and noticed that when I put the power hardtop down the passenger window did not drop to protect the rubber, as it is supposed to do. I did notice the window not working at all a couple of weeks ago but, of course, haven't been out much because of the lockdown, but it did start operating again.

When I got back I put the roof up, no problem, but as the window did not drop again I pushed the door open from the drivers side.

Just been out again and I noticed the PRHT light flashing as if it was operating up or down. I released the catch and tried to drop the roof but only the cover, at the back, rose up and the main part of the roof did not move at all.
I dropped the cover and tried again, still the same, the roof would not go down.
Meanwhile, the roof indicator is still flashing all the time when the ignition is on.

The manual only says there is a problem and to see a Mazda specialist garage.

Has anyone else had a similar problem? Any ideas? (I haven't looked further into it myself, it can't be fuses or it wouldn't work at all).

Any assistance would be greatly appreciated, as I said, this is the only problem I've had in 13 years so I've been very spoilt with this car!
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The only issue that comes to mind is sometimes when the grommet that holds the passenger side windscreen scuttle fails and lets water in, this can have all sorts of odd effects. A friend did have very similar issues with his PRHT, He removed the cover plugs, screws and grommets and replaced with new on both sides, after a period of we assume drying out, all the roof functions returned to normal.

Grommets: https://www.mx5parts.co.uk/windscreen-cowl-grommet-mk3-35-p-3199.html

Ciover plugs: https://www.mx5parts.co.uk/windscreen-cowl-hole-cover-mk3-35-p-2856.html

A cheap fix if it is the case and yes, these grommets do tend to shrink and crack after a while. Hope that helps.
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The only issue that comes to mind is sometimes when the grommet that holds the passenger side windscreen scuttle fails and lets water in, this can have all sorts of odd effects. A friend did have very similar issues with his PRHT, He removed the cover plugs, screws and grommets and replaced with new on both sides, after a period of we assume drying out, all the roof functions returned to normal.

Grommets: https://www.mx5parts.co.uk/windscreen-cowl-grommet-mk3-35-p-3199.html

Ciover plugs: https://www.mx5parts.co.uk/windscreen-cowl-hole-cover-mk3-35-p-2856.html

A cheap fix if it is the case and yes, these grommets do tend to shrink and crack after a while. Hope that helps.
Thanks Steveti, we have had some very heavy rain over the past couple of days, not prolonged but fierce so it could have forced it's way into places other rains can't reach!
I'll see what happens when the weather brightens up and open her up to dry out.
I checked all the drain holes not long ago but I'll have a look at those covers, grommets etc. Be interesting to see if it works when it all dries out first.
Cheers, I knew someone on here would have an idea to try.
Dave
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With the lockdown as it stands I've been detailing the GM and doing a myriad of small jobs, given that the car is now 8 years old, this very job is on the agenda, I'll have the scuttle off anyway to give it a thorough clean up and plastic treatment so for the sake of a few quid, new grommets and plugs as well.
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If the Scuttle panel is leaking you will see evidence if you remove the glovebox. It's very difficult to remove the scuttle panel hole covers without damaging them, so probably worthwile as I did order replaceaments, imo it's not worth replacing the screw locating grommets as again it's easy to damage the surrounding paint during removal and thus create more of a job. A tidy blob of Fernox LSX will seal around the grommet and screw thread.
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This may help.

https://forum.miata.net/vb/showthread.php?t=716093

it's a recent thread so give it a couple of days to develop.
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Thanks for the replies and advice.
I've ordered the grommets and scuttle covers. I had a problem in the past with one of those scuttle covers and when it went in for a service they replaced the one on the drivers side. Probably cost a fortune being done during the service!
I'll have a look at removing the glove box too so I can have a look in that area.
Cheers and thanks again.
Dave
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