o/s indicator bulb

[myacheinbones]

My 320 cls has developed a fault, the o/s indicator bulb stays lit even when the ignition is off and key removed, anyone got any idea what the problem is.

 

[100%Bitch]

Relay?

 

[myacheinbones]

Relay?

I hope you're right, but it's only the off sìde front that stays on. Which fuse box is the relay in.