Diesel Data: Automotive Repair

Test D

PINPOINT TEST D: ONE HIGH BEAM HEADLAMP IS INOPERATIVE


Test D1:






Test D2-D4:






Test D4-D5:






Normal Operation
The LH high beam receives power through circuit 29S-LE15 (OG/BK). Ground for the LH low beam is provided through circuit 31S-LE15 (BK/GN). The RH high beam receives power through circuit 29S-LE16 (OG/GN). Ground for the RH low beam is provided through circuit 31S-LE22 (BK/RD). The front electronic module (FEM) controls the ground for both high beam bulbs individually.

Possible Causes
- circuit 29S-LE15 (OG/BK) (LH headlamp) open
- circuit 29S-LE16 (OG/GN) (RH headlamp) open
- circuit 31S-LE15 (BK/GN) (LH headlamp) open or short to power
- circuit 31S-LE22 (BK/RD) (RH headlamp) open or short to power
- FEM