Symptom Related Diagnostic Procedures

If the Daylight Running Light (DRL) system (park, tail and low beam headlights) are completely inoperative, but the headlight switch operaties normally, check for an open in CKT 541 or CKT 1450 to DRL module. Also, check for a poor connection at DRL module connector C1 terminal "A" and terminal "F." If OK, replace the DRL module.