Professional alarm/remote starter installer here.
I'm pretty sure there was no factory remote start until the current-style (2005-up?) STS came out.
Your remote starter must be an aftermarket one......but then again, you mentioned a message in the car's factory Driver Information Center?
1. What is this service switch you mentioned, where is it, and what does it look like?
2. Does the remote control have a brand name, or telephone number, or anything like that?
3. Exactly what words are displayed there in the DIC?