I don't have this radio, so someone tell me if this even makes sense... 1, turn ignition on, and within 15 seconds: While pressing and holding the "CAR" switch, operate the light control switch: Off → Tail → Off → Tail → Off → Tail → Off. That should enter diagnostic menu, someone try and let me know how it goes! Chris
Sorry for the repost - saw someone ask the other day, and I had my TIS subscription while doing my remote start so thought I'd share... c