IPMB CANBus switch signal sending?

[auto-hentzschel]

Hello
How can I send a switch signal via CANBus.
IPMB installed to a different car, It works, video signal is there and also IPMB exist in the modul list. But for switching from Front to rear camera normally it need to press the Camera button on the dashboard. But I'll not install that Button. because its the full panel and I don't have it. The switch signal comes via CANBus.
My question is, how can I simulate this Camera switching signal via CAN Bus?
anyone with knowledge in this special functions?
Thanks

[pd3jcw]

From what car did the IPMB came, and in what car did you mount it ? maybe i can have a look at the schematics and see how this switch is supposed to be working !