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bj
#1 Posted : 27 August 2018 15:53:28(UTC)
bj

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When I try to put the roof down the LH window doesn't open slightly - as it should - then the rear deck opens but the roof won't.  I've tried disconnecting the battery to reset but to no effect.  Attempting to open the window using the window switch has no effect either.

Any ideas?

Thanks

Barry

 

Barry
Salisbury

Now - 2010 Sport Tech

Previous - 97 Dakar 110/400
rhino666
#2 Posted : 27 August 2018 16:11:40(UTC)
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Hi Barry

The MK3 has electric mechs similar in operation to the MK1 and MK2.

I would imagine you either have an issue with the mech itself or the switch. If the power roof operates through the window switch to drop the windows, it could be either.

It would be a nuisance to go through the process of removing the door skin to check the mech and then find the problem is with the switch, so I would probably try to test the mech by bypassing the switch on that side first. work out where the earth and live terminals need to be to lower/raise the window and test with direct supply from battery.    

1997 black 1.6i MK1 - 4/12/2002
1991 red 1.6i Eunos - 21/9/2008

bj
#3 Posted : 28 August 2018 07:06:19(UTC)
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Thanks Rhino - I will take a look.
Barry
Salisbury

Now - 2010 Sport Tech

Previous - 97 Dakar 110/400
Mac5
#4 Posted : 28 August 2018 07:48:03(UTC)
Mac5

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Same happened on my previous NC1; turned out to be the window switch which is an integral part of the roof operation. It's expensive to replace and here's why…

MX5 PRHT Window Switch

Very Happy MX5 Driver: Spirited Green NC Sport Black BBR Super 200/Sports mid-pipe/GT Backbox, K&N Air/Oil, MeisterR ZetaCRD coilovers, Geo (WIM), Team Dynamics Race Pro 1.2 alloys, SmartTop.
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bj on 29/08/2018(UTC)
Drumtochty
#5 Posted : 28 August 2018 08:24:10(UTC)
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The roof is operated by it's own ECU.

It will not operate if:-

The speedometer is showing the car moving
The boot is open or the boot open sensor is saying the boot is open
The car is in gear
Each of the two side windows has lowered to allow the roof to move.
The motor or motors are reporting no issues to the ECU

I believe if you download the Mazda diagnostic software on to a Windows laptop and it can be rented by the day from the Mazda European Portal, that will report the issues with the roof.

For the avoidance of doubt, No, I have not downloaded that software in the past, therefore I can give no further guidance here.

Edited by user 28 August 2018 08:24:58(UTC)  | Reason: Not specified

Eddie Cairns

99 Mk2 1.8IS
08 Mk3 2.0 Sport RC sold
18 Mk4 2.0 GT+
Drumtochty Glen, Auchenblae, Laurencekirk,
Aberdeenshire
Speedy aka Ian
#6 Posted : 28 August 2018 09:38:54(UTC)
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I had the very same problem on my NC1. As already said, Turned out to be the window switch at fault.

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bj on 29/08/2018(UTC)
rhino666
#7 Posted : 28 August 2018 09:51:50(UTC)
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Unfortunately it is likely to be the switch but at least  you will have an easier job replacing that than the window mech.

Not cheap and specific to the retractable hardtop and MK3.5/MK3.75 cars............................

New Switch

Available used for around half the price from a reputable source................

Used Switch  

1997 black 1.6i MK1 - 4/12/2002
1991 red 1.6i Eunos - 21/9/2008

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bj on 29/08/2018(UTC)
Japester
#8 Posted : 28 August 2018 12:54:34(UTC)
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I had the same issue with the LH window / PRHT not working and in my case, it was the switch.

Luckily, I managed to fix it by following these instructions on miata.net https://forum.miata.net/vb/showpost.php?p=9003917&postcount=14 

Yours may be different but worth a try if you are going to replace the switch anyway.

JP

NC1 2.0 Sport PRHT - Galaxy Grey - 57 Plate
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bj on 29/08/2018(UTC)
RichardFX
#9 Posted : 28 August 2018 18:12:43(UTC)
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Originally Posted by: Japester Go to Quoted Post

I had the same issue with the LH window / PRHT not working and in my case, it was the switch.

Luckily, I managed to fix it by following these instructions on miata.net https://forum.miata.net/vb/showpost.php?p=9003917&postcount=14 

Yours may be different but worth a try if you are going to replace the switch anyway.

JP

I would have re-flowed all the solder joints for the connector pins, because a couple of the others looked like they had the beginnings of metal fatigue around the outline of the pin and were likely to follow.

In my experience this is also the main cause for failure in car radios and head units, specifically the main external connectors (cable stressing and vibration) and the power amp pins (heat cycling causing expansion and contraction stresses).

2008 Niseko NC 2.0
2016 Mazda3 SE-L Nav 2.0
bj
#10 Posted : 29 August 2018 12:15:57(UTC)
bj

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Switch now replaced (trip to MX5 parts this morning) and all is now well (I managed to release the old switch through the handbrake gaitor so didn't need to remove the console). Thank you all so much for all your contributions - my membership has just paid for itself!

Barry
Barry
Salisbury

Now - 2010 Sport Tech

Previous - 97 Dakar 110/400
The hairy angler
#11 Posted : 20 September 2018 17:24:48(UTC)
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I have similar issues re. power hood. SOMETIMES when opening hood LH window does NOT open. Hood functions correctly, folds into place, BUT warning light remains. If I then drop window using centre window switch, start to close hood and then open it warning light goes out and things work properly. Too bloody wet to investigate further at present. At least hood is fully closed. 

Regards, John D

John D.
aka The hairy angler
Abertillery
South Wales

Mazda 2l MX5 Niseko Roadster Coupe. Ice Blue
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