Hello

Both codes apply to the lack of power.

First of all - check the battery. Both errors show it maybe discharged or faulty.

Ewentually (if it's LDC):
error 39 - The voltage is to low
on pin x13:1 and x13:11 lower than 35V

Check the routes: 1X11:1 - F8 - A1:2
or 1X11:11 - 1F6 - 1A1:2
or F8:2 - X12:4 - R1 - 1R1 - X12:2 -1F6:2
or 1X11:2 - 1F2 - S2 - X10:L+ - G1

Error 45
Voltage difference between 1X11:15 and 1X11:1 > 8V
or
Voltage difference between 1X11:15-1X11:11 > 8 V

The above data applies to LDC version of 335-02
if it's LLC or with LDC/LLC with Kombi it maybe slightly different

Check these, but in my opnion -it's battery.