Check for an electrical connection between ground and terminal Black 32.
If there is no electrical connection, then a break in the Black wire between point G2 and terminal 32 of the control unit should be repaired.
If there is an electrical connection, the ignition must be switched on.
Next, measure the voltage between Black/Yellow (+) 23 and Black (-) 32 contacts.
If battery voltage is present, then power supply IG1 and ground are OK.
If there is no voltage, then check fuse number 1 (15 A).
If the fuse is OK, then repair the break in the Black/Yellow wire between fuse #1 and terminal 23 of the control unit.
If the fuse is blown, it should be replaced.