How do I get my 2000 Honda Civic alarm's remote start to remain on?

I am installing a Carvox car alarm in a 2000 Honda Civic with remote start. Alarm works fine but remote start starts vehicle for 15 seconds and then the vehicle shuts off.

How do I get the vehicle to remain on? Is there a prob with wire connection? do I need to add a relay?
Update: And the manual does not show any information on adjusting timing
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