Test I: One Or More Stoplamps Are Inoperative

PINPOINT TEST I: ONE OR MORE STOPLAMPS ARE INOPERATIVE

I1-I3:

I3-I5:

I5-I7:

I7-I9:

I9-I10:

I11-I13:

I14:

Normal Operation
Under normal operation, when the brake pedal is applied, the smart junction box (SJB) sends voltage to the stoplamps through circuit:
- Rear lamp 1 (LH) circuit 1783 (RD/WH) or 1363 (WH/RD) and (RH) circuit 1783 (RD/WH) or 1365 (GY/LB).
- Rear lamp 2 (LH) circuit 1783 (RD/WH) or 1728 (LB/OG) and (RH) circuit 1783 (RD/WH).
- High mount stoplamp circuit 1374 (TN/LB).

Ground for the stoplamps is supplied through circuit 1205 (BK).

Possible Causes
- An open in circuit 1205 (BK), 1363 (WH/RD), 1365 (GY/LB), 1728 (LB/OG), 1783 (RD/WH) or 1374 (TN/LB)
- A short to ground in circuit 1363 (WH/RD), 1365 (GY/LB), 1728 (LB/OG), 1783 (RD/WH) or 1374 (TN/LB)
- Lamp
- Smart junction box (SJB)