check the power/signal harness the goes down into the opti on the passenger side. i just had a similar issue and found the end of mine the plastic was all cracked off the plug and was full of oil/coolant/water. ordered a new one for 12 bucks and its perfect now.
http://www.ebay.com/itm/Vented-Optis...BXjiz~&vxp=mtr
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