Electric side mirror adjustment fault

[cwA3]

I have an issue with my electric side mirrors that when I try to adjust the mirror downwards it will not function.

This fault is on both side mirrors and only the downwards direction is affected as the up, left and right adjustments work. 
 

i have a feeling this fault may be to do with the control knob on the door or associated wiring.

 

has anyone had this issue and can offer some advice?

 

 

 

[cliffcoggin]

Like you, I reckon the switch or its down connection is probably the culprit. It's the only common factor for both faults.