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Welcome I'm Chris aka Moose
So far it is looking like a faulty multifunction switch. Do you understand wire diagrams and electrical testing?
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HI Chris- I do as a layman- I have a tester
Below are the wire diagrams.
Couple more questions, do you have access to a diagnostic tool so we can monitor the inputs and outputs to the CEM module? If you unplug the mutifunction switch do the rear wipers stop?
No access- I took the fuse out to stop the wiper. Talked with Volvo service today- said turn signals and wipers are on separate module- do you think so? They want about $250 to replace signal module, but without seeing car, who knows?
Both do have the CEM module in common but we are stuck at needing to do some tests with a scan tool before doing electrical tests. Nothing should be replaced without testing. You can see all the modules involved form the prior diagrams.
Thanks Moose- from your advice it looks like it's beyond me without testing equipment. At least I can bring it in better informed.
Your welcome and thanks for rating my response and leaving feedback.
I hate that you spent money to get your question answered, though left not pleased with my help. I am still here available to help. We can start over from the beginning or where we left off.