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When this happens on the 2010 corolla either the control head has broken on the back where the mode cable connects or the mode cable it self has broken. I have seen a handful of each. You will need to remove the control head and take a look at the back where the cable connects to see what happened. Have you pulled anything to get to the control head yet?
Here is the last step in the process. Take a look at the prior 14 steps and let me know if you think this is something you want to tackle. It's a little involved.
Let me know if you still need help with this.
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