Hello,

It turns on the screen for about 5 seconds - appears only image - and turns off.

AVIC-X940BT is similar to AVIC-X930BT and I have found many important informations in service manual "pioneer_avic-x930bt_avic-9310bt_avic-f930bt_sm.pdf"

System uCom IC1302 switches power on/off of the CC MONITOR UNIT (signal NAVION / NAVION5 -> Power lines CCD5 & CCD3): ON 4,8s / OFF 1s.
On AV CONNECTOR I have found CTOEX signal - TTL-RS23 (115200kb) from CC MONITOR UNIT CPU IC4001 TT4421. On every restar CPU IC4001 sends ONLY this message:

**** IPL Version. 01000000 ****
Centrality Windows CE 09Light Bootloader Version 02000000 Built May 10 2011 11:04:35

There is no problem with DVD, power suppliers.

I suspect software / flash problem.

Did someone tests GGS1098 file with AVIC-X940BT?

Any suggestions?