Suburban retractable running boards

I would start by checking the fuse ( should be listed in the owners manual the size and location. If that checks out as good try checking the door switch itself as it could be damaged or malfuctioning.

Oh and yes they should go up automatically when all doors are closed.

Michael, Thanks for the reply. Do you think the cold can effect the operation? I' in New England and it's been below zero for a few days. Bob

Yes, cold weather defintly can effect a cars electronics.