- Buick Ownership
- 2018 Buick Regal
Not sure... But the guy with the problem had no horn and just the siren and all only when the vehicle is remote started and sitting idleOK--since the siren is factory, the problem would point to the BCM--but don't know if it's just 'well we sounded the horn & nobody did anything--let's try a siren' as in a fixed delay switch, or whether the 'siren mode' has it's own inputs to initiate...
My guess is a hood, door or truck switch but that's just a guess