Power Circuit Check
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.
Ensure ignition is off. Connect a voltmeter between measuring unit terminals No. 18 and 19, and then between terminals No. 36 and 19. Battery voltage should be present in both cases. If voltage is not as specified, check fuse, wiring and relay. Turn ignition on. Voltage should decrease from 12 volts to about .1 volt at terminal No. 36.