Electrical problem.

[Civandri]

Hello. Have some problem to start my car. It cranks but not light up. The rellays are good havw tested them. Tried to connect to obd but dosent recrive any msg from ecu. I thinking it might be ecu. There is video bellow. YouTube it in latvian but, dont have any onother video, so hope maybe some one can help me.

[JustCruisn]

Flat battery. Charge battery or install a new one.
Battery has enough power to run the dash lights but not enough to run the engine starter motor.