Easy answer- you have the wrong feature code programmed into the R2LC.
Most likely, to get a blinking result- it's current incorrectly set to 5 and probably should be set to (correction 6 for a steady on CAB light).
The most common codes used are 4 for Steam and 8 for a huge swath of diesels and electrics. The code 5 is the one that blinks a strobe, and in your case, it looks like 6 or 8 are the most probable answers.