I don’t fully understand your problem. Can you please post a (complete) version of your program that does what you expect and a version that you think should work but doesn’t. Also, can you be any more specific about what “doesn’t work” means?
That LED pattern indicates that the qik is in baud detection mode, which makes it seem like the controller reset when you tried to set the motor speeds. One easy way to test this would be to insert a long delay (maybe 5 to 10 seconds) after sending the first (0xAA byte). If the controller is resetting, you should see the green LED do its brief heartbeat flash a few times and then go back to its even flashing after the delay.
It sounds like you have a power or motor noise problem, or some combination of the two. What is your power supply and what is the stall current of your motors at the voltage you’re using? Have you taken any precautions to limit motor noise (e.g soldering 0.1uF caps across your motor terminals, using the shortest motor leads possible, routing motor leads away from signal lines, and twisting motor leads around each other)?
I added 5 seconds delay after 0xAA. After 5 seconds of the delay, the green light flashing pattern was in baud detection mode and the red light was on.
Both motors were soldered with 0.1uF caps.
I removed the motors connection from the qik2s9v1 and the green light flashing on and off in 2 seconds and red light was off after the delay.
You seem to be kind of reluctant to share details, but without details I can’t help you. For example, can you confirm that the flashing pattern actually changed after the 5 second delay when your motors were connected?
Can you answer my questions about your power supply and motors? Also, a picture of your setup along with a description of how everything is connected would be helpful. Finally, I suggest you add some code to your Arduino sketch that can let you tell if the Arduino is resetting (e.g. program it to blink the user LED a few times at the top of setup() before you start sending serial bytes).
Edit: I just saw the update you added to your post. If it works without motors connected, that’s a very good indication that you have a power or noise issue, so we should look into how you’re powering everything and the specifics of your connections.