Ronaldo made the appeal after helping Real to victory at Barcelona last night.
He said: "Bayern Munich have a great squad, but we'll face them at our stadium with our crowd. This victory makes us confident and we're excited about getting a good result on Wednesday.
"I wish team and fans to reach the final together. I expect the fans to be with us from start to finish on Wednesday. We need the Bernabeu to be the first player on the pitch. We are all looking forward to winning on Wednesday."