Originally Posted by
az3579
You need an LCM with software version 4.0 or higher to have this feature. Only late '05 and '06 coupes/verts had it from the factory, and even then it had to be coded.
The only way to get it is to by having a version that's 4.0 or higher, than code VIN and mileage to the LCM and code the triple blink to be enabled.
You can either buy a used one and code the VIN and mileage or maybe have it flashed by terra if he's still offering the service and IF your LCM meets the requirements.