Hi guys when I got the car the spoiler never worked at all so I stripped the motor out of the mechanism to find the brushes had gone I cross referenced the motor and replaced with a BMW sunroof motor and it now operates through the three stages and returns to the park position but after cycling through the stages the light comes on on the dashboard and then will not work again until I turn the ignition off and on again and it will then cycle through the three stages.ive looked at the old motor and there are no electronics to support any height control it's purely a motor,any ideas why this is happening ? Is there an installation process to follow etc thanks