Peugeot Repair Questions? Ask a Mechanic for Answers ASAP
The first thing I would do is remove the steering cowling and disconnect the wiring from the ignition switch.
If the lights go off then the ignition switch is at fault.
Next would be to remove the relays one at a time to see if the lights go off.
If the lights still stay on then you need to inspect the wiring further for a short circuit to a live feed somewhere.