Eco Switch noise over speaker

[metro176]

Can anyone help? When the eco switch on my 2008 451 MHD is active I get popping and creaking noises from the driver's door speaker. Changing the radio doesn't help. When the radio removeable panel is disconnnected (Pioneer Satnav) the noise disappears.

[10:45PM]

Gotta be an earthing issue on the head unit I'd guess , or the antenna cable/connection compromised.

Are you sure it's not both speakers (maybe you just hear the drivers side one because you're closer to it ?

[metro176]

Thank you for your response. I have swapped head units from a standard radio to the Pioneer. Noise was present on both units. Definitely the drivers side. Initially I thought it was coming from the petrol tank and traced it to the drivers door speaker only.