Not sure if anyone will ever need this but here it is for future reference. I found it on enginepartsdiagram.com and it should work for the Q40 and the Q60.
Hope this helps.
Same concept but different model in this video:-Turn the ignition key to position “ON” without starting the engine, If your vehicle has Smart key button, press the “Start” button twice without touching the brake pedal.
-Watch the airbag light closely. It will stay on for a few secs. and then as soon as it blinks off (the start of the flashing), turn the key off instantly.
-Wait for more than 3 seconds
-Repeat steps 1-3 two more times until you have done the cycle three times.
-Now turn the key on and watch the light. It will start blinking in a different, slower manner. This is diagnostic mode. You can watch this for a little while, no hurry.
-Now turn the key off again, wait for more than 3 seconds, and turn back on.
-Turn the ignition off and then start the engine to verify the indicator has been reset
Hope this helps.