I turn the key on my car but wont crank, lights on dash are coming on?

One of the most commons problems with no crank on Q45, M30 is the starter relay, but on G20, J30 and I30 the most common problem is the starter motor:

Al so check these Items:

• Battery terminals

• Starter motor

• Ignition switch

Need a starter relay?
 

Q45 Starter Relay