that should be enough to energise the relay - try plugging the relay back in and turning the ignition on and off a few times whilst holding the relay - you should be able to feel it click, just to make sure the relay is working OK

next test - check for continuity between ABS ECU wiring loom terminal 18 (blue/white wire, ECU unplugged) and the main solenoid valve on the brake assembly under the bonnet (2 pin connector), and whilst you've got the connector off, check that the main solenoid earth does indeed have continuity to earth (brown wire)