Test O: One Or More Parking, Rear Or License Plate Lamps Are Inoperative

PINPOINT TEST O: ONE OR MORE PARKING, REAR OR LICENSE PLATE LAMPS ARE INOPERATIVE

O1-O3:

O3-O5:

O5-O7:

O7-O8:

Normal Operation
The smart junction box (SJB) monitors the headlamp switch position. When the headlamp switch is in the PARKING LAMPS ON position, the SJB supplies voltage to the parking and license plate lamps. If a problem is detected with any of the signal circuits to the headlamp switch, the SJB defaults the parking lamps and the headlamps on. The LH front parking lamp and side marker are supplied voltage from circuit 1340 (DG). The RH front parking lamp and side marker are supplied voltage from circuit 1339 (BK/PK). The LH auxiliary parking lamp is supplied voltage from circuit 1344 (VT/LB). The RH auxiliary parking lamp is supplied voltage from circuit 1343 (PK/OG). The LH rear lamp is supplied voltage from circuit 1364 (DB/YE). The RH rear lamp is supplied voltage from circuit 1366 (TN/RD). The license plate lamps are supplied voltage from circuit 1370 (DG/LG). Ground for the LH front and both side lamps is supplied through circuit 1205 (BK) from the bussed electrical center (BEC). Ground for the remaining lamps is supplied through circuit 1205 (BK).

Possible Causes
- Circuit 1205 (BK) open
- Circuit 1339 (BK/PK) open
- Circuit 1340 (DG) open
- Circuit 1343 (PK/OG) open
- Circuit 1344 (VT/LB) open
- Circuit 1364 (DB/YE) open
- Circuit 1366 (TN/RD) open
- Circuit 1370 (DG/LG) open
- Headlamp switch
- BEC
- SJB