Test B: One Low Beam Headlamp Is Inoperative

PINPOINT TEST B: ONE LOW BEAM HEADLAMP IS INOPERATIVE

B1:

B2-B4:

B4-B5:

Normal Operation
The smart junction box (SJB) receives voltage from the battery junction box (BJB) through circuit SBB34 (YE/RD) (LH headlamp) and circuit SBB29 (GY/RD) (RH headlamp). When the SJB detects the headlamp switch in the HEADLAMPS ON position and the multifunction switch in the LOW BEAM position, the SJB sends voltage through circuit CLF04 (BN/BU) (LH headlamp) and circuit CLF05 (BU/GN) (RH headlamp) to the low beam headlamps. Ground is supplied on circuit GD120 (BK/GN) (LH headlamp) and circuit GD123 (BK/GY) (RH headlamp).

Possible Causes
- Fuse
- Circuit CLF04 (BN/BU) open or short to ground
- Circuit CLF05 (BU/GN) open or short to ground
- Circuit GD120 (BK/GN) open
- Circuit GD123 (BK/GY) open
- Circuit SBB29 (GY/RD) open
- Circuit SBB34 (YE/RD) open
- SJB