while you are at this, also check fuses 6 and 15 in glove compartment - make sure they are good...

Also, i will stand corrected, the LWR module is only up/down controller, you have AHL module, which is the up/down, and left/right controller... anyways, we need to see if your issue is mechanical, as Twins mentioned, and the blinking light reports inability of electronics to control the stepper motor (it gets the info back on the motor position), or the AHL module is corrupted...