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verify all wire colors and diagrams before applying any information.









Next, I would double check the CM900-S to verify that Programming option 1-01 was indeed set to the Default, OFF. I have noticed that sometimes setting options online with the ADS USB cable does not "hold". Using the OP-500 programming always works and holds. If you don't have the OP-500, you can make changes to Groups 1 through 4 with your remotes. It's a tedious process but doable.
The troubleshooting aspect comes next. If the programming and wiring is correct, I would cut the connection from the CM900-s Unlock output to the vehicle and see what happens during a R/S. If the door still Unlocks then cut the Disarm output connection to see if that is causing the Unlock to happen. Be aware that the Honda Factory Alarm system will be triggered with a R/S.