Interior light and headlight warning buzzer

[coys84]

I've been having trouble with my interior light staying on in the door open position and warning buzzer not coming on when i leave my lights on.
The van came with deadlocking only so i bought a central locking module with rc off ebay when i first got the van. Its been wrecking my head recently as to why this is happening and had a feeling it was working when i bought it in November.
This morning I put the old module back on and all is working fine again. Light goes off after 15 seconds or so and warning buzzer is back.
Anyone know why the rc module would cause this.

[paul2012]

Faulty module

[coys84]

Faulty module

Sort of presumed that, just hoping I didn't need to buy another one.

[coys84]

Another Module fitted and everything working as it should, Thanks. Just my airbag light to try sort now. hopefully soon