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Home >> Mazda >> 2021 >> CX-3 AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 44 (On-Board Diagnostic - Adaptive Front Lighting System Control Module) >> DTC U0001-88; U0100-00; U0131-00; U0140-00; U0155-00: Unit Communication Error (HS-Can) >> Notes
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DTC U0001-88; U0100-00; U0131-00; U0140-00; U0155-00: Unit Communication Error (HS-Can): Notes

WARNING: This page is about a different car, the 2016 Mazda CX-3. However, it is still accessible from the selected car via links, so may be relevant.
System malfunction location U0001:88
  • Unit communication error (HS-CAN)

U0100:00
  • Communication error with PCM

U0131:00
  • Communication error with EPS control module

U0140:00
  • Communication error with BCM

U0155:00
  • Communication error with instrument cluster
Detection condition 
  • U0001:88
    • The AFS control module detected CAN bus communication line (HS-CAN) malfunction ten times continuously.
  • U0100:00
    • The AFS control module could not receive CAN signal from the PCM for 5 s or more  .
  • U0131:00
    • The AFS control module could not receive CAN signal from the EPS control module for 5 s or more  .
  • U0140:00
    • The AFS control module could not receive CAN signal from the BCM for 5 s or more  .
  • U0155:00
    • The AFS control module could not receive CAN signal from the instrument cluster for 5 s or more  .
Fail-safe 
  • U0001:88
    • The swivel actuator is moved to the center.
    • The headlight leveling actuator is stopped at the position when the malfunction is determined.
  • U0100:00
    • The swivel actuator is moved to the center.
    • The headlight leveling actuator is stopped at the position when the malfunction is determined.
  • U0131:00
    • The swivel actuator is moved to the center.
    • Control of the headlight auto leveling system is continued.
  • U0140:00
    • The swivel actuator is moved to the center.
    • The headlight leveling actuator is stopped at the position when the malfunction is determined.
  • U0155:00
    • The swivel actuator is moved to the center.
    • Control of the headlight auto leveling system is continued.
Possible cause 
  • Malfunction in CAN bus communication line
  • Malfunction in CAN communication line between PCM and AFS control module
  • Malfunction in CAN communication line between EPS control module and AFS control module
  • Malfunction in CAN communication line between BCM and AFS control module
  • Malfunction in CAN communication line between instrument cluster and AFS control module
System wiring diagram  -
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