Power Circuit Checks
WARNING: This page is about a different car, the 1993 Volvo 940. However, it is still accessible from the selected car via links, so may be relevant.
Connect a voltmeter between ignition ECU terminal No. 5 (Brown wire) and ground. Voltmeter should indicate 12 volts. If voltage is not present, check circuit between ignition ECU terminal No. 5 and fuse block.