Cisco Aironet 3700 Series Getting Started Manual page 18

Screw down the thumb screws on the module.
Step 5
If the screws are not tightened, the module will not be recognized and may not operate
Note
correctly. Make sure not to over-tighten, only hand-tighten the screws.
Power up the access point. When the access point boots up, it will recognize the module.
Step 6
18