Body, generic

B0810 Left Headlamp Low Beam Circuit

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

Whether any carmaker sets B0810 is unknown – the number shows up in no J2012 excerpt and no service literature. The title covers the left dipped-beam output. The GM-era Saab 9-3 checks it in the front electrical centre under the number B2575: with the switch at dipped beam (position 2), a draw below 0.8 A sets B2575 04 (open) and one of 7.9–30 A sets B2575 0B, which may also mean a bulb of the wrong rating. With xenon lamps the ignition has to be on for 30 s before the test can run. HELLA explains why: the xenon ballast first fires the lamp with up to 30 kV and only then regulates it to a steady 35 W. A dark left dipped beam is a road-safety defect and should be repaired before driving at night. Right side: B0811.

Likely causes

Low-beam bulb burnt out
Bulb of the wrong wattage fitted
Xenon ballast or igniter faulty
Corroded headlamp plug or poor ground
Lamp output of the lighting or body module faulty

Symptoms

  • Left dipped beam dark, lamp failure message in the display
  • Reduced view of the left road edge at night; repair before driving in the dark
  • Light flickers or fails only after the lamp has warmed up

Repair estimate

DifficultyEasyDIY possible
Parts and labour€10–600
Time0.2–2 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

left low beam lampbody control module

Related codes

B0811B0800B0820

References: saabwisonline.com, saabwisonline.com, hella.com, law.cornell.edu.