Downdraft Blower repair/replacement

I am little nervous to be the first time poster. So please bear with me.

I have Jenn-Air brand electric cooktop. Everything else works but the downdraft blower.

So far I have replaced the on/off switch part number: AP205458
(http://www.appliancepartspros.com/partsearch/model.aspx?model_id=24055)

Still the blower motor doesn’t work.

I have not opened the downdraft assembly so far as I don’t have the repair manual.

So here is my question.

Should I go ahead and order the following two parts:

  1. Blower motor AP366406
  2. Repair manual AP2662740

I am not sure if the repair manual will have all the details about the following:

  1. Help me to check the electrical circuit to the motor,
  2. If I find out that electrical circuit is OK, then the manual has enough detail to help me with replacing the motor.

Thanks.