Wipers switch radio off !

[JimM169]

I've just switched out the radio unit in my ancient Volvo V40, nothing fancy just a straight swap from a Pioneer to some Nikkai thing from Maplins (basically I needed something with SSD card and Bluetooth)

However now when I switch the wipers on or off the radio dies momentarily and comes back on a few seconds later. I've checked the connection at the plugs etc and everything seems tight so any ideas of what else I could look at or is it just going to be down to it being a cheap unit?

Cheers

[JimM169]

Hi, yes radio switches on/off with ignition as it should. All the wiring to the radio is straight into the moulded plugs on the loom ie I just unplugged the old unit and plugged the new one in, no wiring was modified.