Diesel Data: Automotive Repair

Test C

PINPOINT TEST C: ONE LOW BEAM HEADLAMP IS INOPERATIVE


Test C1-C2:






Test C2-C4:






Test C4-C5:






Normal Operation
The LH low/high beam bulb receives power from circuit 29S-LE15 (OG/BK). Ground for the LH low beam is provided through circuit 31S-LE16 (BK/RD). The RH low/high beam bulb receives power through circuit 29S-LE16 (OG/GN). Ground for the RH low beam is provided through circuit 31S-LE23 (BK/WH). The front electronic module (FEM) controls the ground for both low beam bulbs independently.

Possible Causes
- circuit 29S-LE15 (OG/BK) (LH headlamp) open
- circuit 29S-LE16 (OG/GN) (RH headlamp) open
- circuit 31S-LE16 (BK/RD) (LH headlamp) open or shorted to power
- circuit 31S-LE23 (BK/WH) (RH headlamp) open or shorted to power
- FEM