That's a really good question guys, what lead to the diagnosis?
For me it was a series of things:
- First, check the codes. Mine were 314 and 324. Right rear sensor signal problems.
- Next start at the least expensive part and work my way up. I replaced the rear sensors to no avail.
- Then I traced the pins and found that by wiggling the pin specific connectors in the CU, the problem would go away.
- The clincher for me was to talk to a number of mechs from different Volvo repair places. All of them said that in 95% of the cases with a right rear wheel sensor signal interupt code, that the CU had to be replaced.
Now I'm saving my pennies to purchase a ew CU.
Hope this helps.
Scott
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