Here's the message about shorting the battery cables. I didn't believe it either. If he is a service advisor, he may be pulling a prank. I haven't seen this kind of poor advice from any mechanic who knows.
GR
S80 no power to Heat, A/C, fan controls, traction, all controls below radio [S80] ] posted by someone claiming to be Nick on Tue, Jan 21st 2003 at 5:48 PM
Try touching the battery cables together, this will momentarily 'wake' up the ECC unit. While its just a temporary fix, it should work. That will be one hour labor.....
Just a note from a friendly Volvo service advisor
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