F 150 2WD Pickup V8-5.4L SOHC VIN 5 (2004)
Test K7
Normal Operation
The BPP switch is supplied battery voltage through circuit 10 (LG/RD). When the brake pedal is pressed, the BPP switch routes voltage to circuit 511
(LG). Circuit 511 (LG) supplies power to the multifunction switch and the high mounted stoplamp. The multifunction switch internally routes the
power (when in the neutral position) to circuits 9 (LG/OG) (LH stoplamp) and 5 (OG/LB) (RH stoplamp). Circuits 9 (LG/OG) and 5 (OG/LB) are
routed through the central junction box (CJB) and then on to the LH and RH stoplamps accordingly. Circuits 9 (LG/OG) (LH stoplamp) and 5
(OG/LB) (RH stoplamp) are spliced (and fused) within the CJB to circuits 52 (YE) and 64 (DG) respectively.
Possible Causes
-
circuit 5 (OG/LB) short to power
-
circuit 9 (LG/OG) short to power
-
circuit 52 (YE) short to power
-
circuit 64 (DG) short to power
-
circuit 511 (LG) short to power
-
BPP switch
-
multifunction switch
-
ABS module
