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Ah, as you were referring to the reversing light, I presumed the other lights mentioned were also rear ones.
Most common fault is the DRL bulbs, which have dual filaments. Sometimes get overlooked when checking for faults. A failed one can also incorrectly display the headlight bulb failure message.
Basically the DRLs should be bright with the lights off, but engine running, but dim down when sidelights or headlights are switched on. What some people assume is that they are fully working when they see the DRLs on without the head or sidelights being on.
As for the reverse light, it could be a sticky reverse light switch on the gearbox.
Most common fault is the DRL bulbs, which have dual filaments. Sometimes get overlooked when checking for faults. A failed one can also incorrectly display the headlight bulb failure message.
Basically the DRLs should be bright with the lights off, but engine running, but dim down when sidelights or headlights are switched on. What some people assume is that they are fully working when they see the DRLs on without the head or sidelights being on.
As for the reverse light, it could be a sticky reverse light switch on the gearbox.