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Service manual troubleshooting step 1 for "cruise control cannot be set" is Check for PGM-FI DTCs.

If you are getting an intermittent Check IMA warning I would start there.

Step 2 is check fuses B24 and B12

Step 3 you already did by checking the combination switch

Step 4 is use an HDS to check the other inputs. On the CVT that is, idle stop switch, cruise main switch, cruise set switch.
 
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