always worth a pedal test. :-) constant flashing means no codes.
Make sure C.Ds change and play as mentioned, they dont like cd r's and replacement lasers are very hard to find.
Sit on the boot ledge feet on the floor within a minute or 2 of the cars starting and feel for the self levelling rising, should hear the pump in the front drivers wing.
Check exhaust behind back box for rust and holes. If its slash cut will be original design, unless its been replaced before the cheaper design came in, if it is original probably about due to fall off by now depending on mileage and general condition of course.
Should be no warnings on the display. Fluids are easy but head light low field of vision can be 50 sobs minimum to sort out. Check the hid light sensors on the pass side suspension arms are in fair nic and feel solidly mounted esp the ball joint to/in the sensor.
If there are rivets visible in the pads they are the better more expensive oe, cheapo wooden tc pads have no rivets so no anti squeal shims.
Lift the bonnet after the test drive for signs of oil smoke from cam cover gaskets.
No real deal breakers provided the auto box(?) is ok, but the above should help knock him down if need be and the general appearance is ok. Hth