This forum is for discussion of topics relating to MX-3 lighting such as Headlights, Tail lights, Accessory Lights, Interior Lights, Etc. For example, Rear Euro Altezza Style Tail lights, Headlight units, LED's, HID's, Bulbs, Interior lights, Neons, Strobes, Auxillary Lights/Fogs or anything filament and gas discharge related.
Also anything dealing with the elctrical system.
I think there is a reverse switch that runs to your tranny so your bulbs know when to light up! Other than that, I think someone else has more detail than I.
First thing to check would be fuses.. then make sure the connection of the reverse backup light swtich is clean/dry and in good condition. You will find more information on the location of this switch in the online shop manual.