Test I: The Stoplamps Are Inoperative

PINPOINT TEST I: THE STOPLAMPS ARE INOPERATIVE

I1-I4:

I4-I6:

I7-I8:

Normal Operation
Under normal operation, when the brake pedal is applied, the stoplamp switch sends a voltage signal to the smart junction box (SJB) through circuit 810 (RD/LG). Voltage for the switch is provided by circuit 1140 (VT). The SJB then sends voltage to the high mounted stoplamps through circuit 1374 (TN/LB).

The SJB then sends a voltage to the rear stoplamps through:
- Freestyle, Five Hundred: (LH) circuit 1363 (WH/RD) and (RH) circuit 1365 (GY/LB).
- Montego: circuit 1374 (TN/LB).

Possible Causes
- An open in circuit 810 (RD/LG), 1374 (TN/LB) or 1140 (VT)
- A short to ground in circuit 810 (RD/LG)
- Stoplamp switch
- Smart junction box (SJB)