F 150 2WD Pickup V8-5.4L SOHC VIN 5 (2004)
Test P4-P5
Normal Operation
The headlamp switch is supplied battery voltage through circuit 195 (TN/WH). When the headlamp switch is turned to the parking lamps on position,
the headlamp switch routes voltage to circuit 14 (BN), which in turn supplies power to the exterior lamps. Ground is provided to the bulbs through
circuit 57 (BK).
Possible Causes
-
circuit 14 (BN) open
-
circuit 57 (BK) open
-
circuit 195 (TN/WH) open
-
headlamp switch
