DTC B1970, Exterior Light Power Fault: Notes

BCM commands exterior lights on by energizing low beam and parking light relays. DTC B1970 will set when exterior lights have been commanded on and BCM detects a short to ground in Red/White wire between BCM and relays. When DTC B1970 is set, BCM will command exterior lights off, then attempt to turn exterior lights on until lights are no longer required. DTC B1970 will clear when exterior lights are commanded on and BCM senses exterior light power on after 2 consecutive monitoring cycles or when scan tool is used.