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Home >> Mazda >> 2024 >> MX-5 Miata Club >> Repair and Diagnosis >> Accessories & Equipment >> Headlights >> On-Board Diagnostic - Adaptive Front Lighting System (AFS) Control Module >> DTC B1439-87: Communication Error With Front Combination Light (RH) [ALH/AFS/ALV]

DTC B1439-87: Communication Error With Front Combination Light (RH) [ALH/AFS/ALV]

B1439:87 (ALH/AFS/ALV) DETECTION CONDITION AND POSSIBLE CAUSE

System malfunction location Communication error with front combination light (RH)
Detection condition
  • The adaptive LED headlights control module detected communication error with the front combination light (RH).
Fail-safe
  • The headlight leveling actuator is stopped at the position when the malfunction is determined.
Possible cause
  1. Front combination light (RH) malfunction (Refer to FRONT COMBINATION LIGHT REMOVAL/INSTALLATION .)
  2. Adaptive LED headlights control module malfunction (Refer to ADAPTIVE FRONT LIGHTING SYSTEM (AFS) CONTROL MODULE REMOVAL/INSTALLATION .)
Repeatability verification procedure
  1. Clear the DTC recorded in the memory. (See CLEARING DTC .)
System wiring diagram
  • Not applicable