OBD Guide

B3806

High Beam and Headlamp Flash Select Circuit Malfunction

Severity
⚠️ Medium
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$6–56 (est.)

Symptoms

  • High beam headlights do not work
  • The headlight flashing function does not work
  • Flashing or flickering high beams
  • Dashboard warning

Causes

  • Broken or damaged wiring harness
  • Blown fuse
  • Faulty relay
  • Problems with the lighting control module
  • Faulty headlights

How to Fix

  1. Check and replace the fuse if necessary
  2. Check high beam control relay
  3. Inspect the wiring harness for damage
  4. Check contacts and connectors
  5. Diagnose the lighting control module
  6. Check that the headlights are working properly

Related codes

Error B3806 by Vehicle Brand