Programming modules in Volvo cars - is it possible to kill it during software loading?

When power-up any Volvo electronic control module, the primary bootloader starts (PBL) for 20 ms (0.02 seconds). During this time the control module receive a programming command (PROG) during these 20 ms the control module enters programming mode and is possible to erase and reload the main / application software.

The programming command is sent by VIDA for approximately 2 seconds / by VDASH is it 5 seconds or 60 seconds in EMERGENCY mode, so that all control modules have time to execute the command and enter programming mode. If no programming command is sent the control module's application software takes over the function of the control module.

If a reset command is sent to the control modules in programming mode, the control modules will enter normal operating mode and start the main / application software.

The primary bootloader means, it is always possible for a control module to enter programming mode even if the application software has been corrupted, for example, during unsuccessful downloading.

So do not panic, if something happend during software loading :o)