Opel Agila 1.3 cdti error P0685 - The car does not start error P0685 as in the t

Hello, Opel Agila 1.3 cdti from 2004 does not start, spins but does not smoke. Computer displays error P0685 - main circuit / main relay voltage low.
Before diagnostics, I was looking for a problem in the fuel system, because the injectors do not release the fuel, the pressure test with the pressure gauge on the pump over 400 bar, there was no scale, the pressure gauge for the basket very low 30 bar on the CR rail. Mechanically by Everything is fine for me. The solution to the error indicated by the computer stopped me WHERE IS THE MAIN RELAY, unfortunately I have nowhere found any topics from AGILA 1.3 CDTI.

PLEASE HELP FROM PROFESSIONALS

There is a box with relays in front of the brake fluid reservoir. There are probably three there. You are interested in the first big one.

Thanks, I will check and give you an answer :)

Added after 10 [hours] 22 [minutes]:

The relay found and checked is operational, the computer described the error as low voltage of the main relay and it is 11.3V. The battery is functional, someone had something to start looking for?

Hello, the topic is a bit old, but I have astre h 1.6 2010 and the same error p0685-06 have you solved this problem because I still have one error p0601-30, the car does not start, maybe someone had a problem where to look for the reason, maybe someone will suggest something. Greetings.

Hello, have you managed to find out what is the reason for such a defect? I have the same error and the car does not start. No electricity at the pump (the pump is operational). Regards and thank you in advance for your help

Hello, you have to look for cables in my case, one was prickly.