Relay Cleaner Control module. What does it do?

[Goonersman]

I have one of these under the dashboard in my 2006 CR-V 2.2 Diesel.  

 

https://www.ebay.com/itm/285693231573

 

They seem to be common to other Honda models (Civic). 

 

What function does it relate to?  

 

Thanks

[Trevor]

As far as I can tell it is for the headlight washers so is tied in with the windscreen washers and also takes a power signal from the headlamps when switched on

[Goonersman]

43 minutes ago, Trevor said:

As far as I can tell it is for the headlight washers so is tied in with the windscreen washers and also takes a power signal from the headlamps when switched on

That makes sense. Many thanks Trevor.