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E36General discussion and technical help for (E36) 1992-1999 3 series cars. 318, 323, 325, 328.
you can test the relays by checking the continuity of the circuits in the relay. Multi meters have a funtion what tells you whether or not two sources are connected. I would assume that using that you can check the relays.
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**CGM **(Certified Garage Mechanic)
^^^The function is actually called what you said: continuity. But you can't always judge a relay through that. You may get continuity, but the relay could still be defective in that it doesn't pass enough current anymore. This is particularly true of relays for O2 sensors, for example.
ebadeau: are you looking for these relays for your '93 325? Your relays must have been replaced before because the OEM brand is Bosch, not Siemens. That said, you probably won't find the Siemens part #'s referenced anywhere. But just replace them with the Bosch counterparts and you'll be fine. Pelicanparts.com should give you all the info you need.