DTC U2121-87: Communication Error With Vehicle Control Module (VCM)
U2121-87: (ALH/AFS/ALV) DETECTION CONDITION AND POSSIBLE CAUSE
| System malfunction location |
Communication error with vehicle control module (VCM) |
| Detection condition |
- The adaptive LED headlights control module cannot receive CAN signal from the vehicle control module (VCM).
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| Fail-safe |
- Control of the headlight auto leveling system is continued.
- Perform the following controls with the adaptive LED headlights turned on.
- Turn off glare-free high beam.
- Set wide-range low beam as basic light distribution.
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| Possible cause |
- Malfunction in CAN communication line between vehicle control module (VCM) and adaptive LED headlights control module
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| Repeatability verification procedure |
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| System wiring diagram |
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