Symptom Chart

WARNING: This page is about a different car, the 2009 Ford Mustang. However, it is still accessible from the selected car via links, so may be relevant.

Symptom Chart

Condition	Possible Sources	Action
The daytime running lamps (DRL) are inoperative	Parking brake switch input concern Headlamp operation Ignition switch input concern Smart Junction Box (SJB)	Go to Pinpoint Test W .
The DRL are on with the parking brake set	Parking brake switch input SJB	With the ignition switch on, apply the parking brake and observe the brake warning indicator. If the brake warning indicator is inoperative, REFER to INSTRUMENT CLUSTER (IC), MESSAGE CENTER, AND WARNING CHIMES to diagnose the brake warning indicator. If the brake warning indicator illuminates, INSTALL a new SJB. REFER to MULTIFUNCTION ELECTRONIC MODULES . TEST the system for normal operation.