No, R15 is a serial resistor for dropping current to the auxiliary fan(s) in front of the A/C condenser. What you want is F15, the fusible link in the blower circuit. The test for F15 is to confirm voltage at each end of the fuse. If NO voltage at the leading edge, there's a problem in the upstream circuit; if NO at the trailing edge, the fuse link is broken and needs to be replaced.

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1988 California version 260E (W124)
Anthracite Grey/Palomino
Owned since new and still going strong and smooth
MBCA member

Past Mercedes-Benz:
1986 190E Baby Benz
1967 230 Inherited from mom when she downsized
1959 220S Introduced me to the joys of keepin' 'em goin'

There are only 10 kinds of people in the world--those who understand binary and those who don't