My Volvo (2002) uses CANBus to monitor various lamps (I assume its current that's monitored). I intend to splice into one of the headlamps and one of the sidelamps and use those live feeds to dim (sidelights) and then turn off (headlights) the DRLs.
Would going via a 1k resistor to the transistor's base cause any problem with the monitoring? I'm kind of assuming it would be quite a high impedance(?) so not be 'noticed'.