Ground Circuit Checks
WARNING: This page is about a different car, the 1994 Volvo 960, 1994 Volvo 940, and 1994 Volvo 850. However, it is still accessible from the selected car via links, so may be relevant.
Turn ignition switch to OFF position. Connect ohmmeter between ground and electronic control unit terminals No. 14 and 20. See Fig 1 . Resistance should be zero ohms.