Citroen C1, mk2, 1.2 litre Puretech Reversing Camera Stopped Working.

[Drewden]

Update, not had time to delve into it, but last week came back on and is now working fine again.

Kept clearing the C1622 in the unit check mode,, remains with a past C1622 code, and the present C1622 code does not come back on.

[Drewden]

Just an update, now working, kept clearing the C1622 code in the unit check mode, it now only displays a C1622 past code, the present C1622 does not display anymore and has now gone.

[Giles1989]

How do you access the unit check mode?