Exactly the same with my GTV, although it was partially my fault as I'd had the seat out, disconnected the yellow pre-tensioner thingy and turned the engine over!
Took it to the dealer and told him exactly what was wrong with it and that he'd have to connect up his little computer to the box under the back seat to fix it - hey presto he did, and I'm £40 worse off! Well it was either that or a piece of black tape over the dash - hardly in keeping!
Get some of those plastic ties for round the yellow connectors to stop them coming apart during take off over hump back bridges! And if your ever taking the front seats out be sure to disconnect your battery before you disconnect the yellow connectors.... it's a steep and expensive learning curve!!