It is located in the front passenger seat back.
The ECU is under the carpet on the passenger side front seat (under the dashboard area where you rest your feet).
how to remove front passenger seat of 1996 Honda Civic EX 2 door coupe
A front passenger seat on a 2005 Honda Civic is held on by four bolts. Pull the seat back to loosen the front two. Pull the seat forward to reach the two rear bolts. Remove the seat.
the seat
The passenger in the rear seat of a car moving at a steady speed is at rest relative to the car itself. This is because the passenger is moving with the same velocity as the car, so they appear to be at rest relative to each other.
The passenger in the rear seat of a car moving at a steady speed is at rest relative to the car itself. This is because the passenger and the car are both moving together at the same speed in the same direction, so from the perspective of the car, the passenger appears to be at rest.
check under the passenger seat
Normally the ECU is located under the passenger seat or behind the passenger kick panel.
there should be two bolts behind the passenger seat, take those out. pull the strap on the passenger seat forward and pull the seat back. after you take the passenger seat off you can see the bolts for the front seat, take them off and back the seat out of the lip.
See: http://cgi.ebay.com/ebaymotors/97-01-HONDA-CRV-CR-V-FLIP-DOWN-ARMREST-in-LEATHER-NEW_W0QQitemZ260402411612QQcmdZViewItemQQimsxZ20090501?IMSfp=TL090501121003r27647
Yes, it has a back seat.