Hi new here I have 04 civic auto 1.7 I just replace ecu with matching immobilizer and key I still have no check light before start and immobilized green key light also fuse are ok did both check visual and test light also replace relays behind glove box still nothing anything would help thanks

 

If the fuses have power and are good fuses and the relays are good
Then it has to be a wiring issue (as long as the ECU, immobilizer and key are functional)
Check connectors and see if any pins are bent
Look for fray or broken wires.
May be a critter ate through a wire or two??

Note: On another forum, the person had no dash lights and said he checked all the fuses and were good.
None of it made sense. Common fuse was under dash fuse #10. Just asked them to replace anyway.
He said that fixed it. So, sometimes it is the little things we don't see. That surprised me.
Not saying it is the fuse. Just saying that there must be something I can't see.

 

Ok I will take a look thanks keep u posted