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Home >> Mazda >> 2021 >> CX-9 Signature >> Repair and Diagnosis >> External Pages >> Different car >> Section 150 (On-Board Diagnostic - Adaptive Front Lighting System Control Module) >> DTC U0001-88; U0100; U0131; U0140; U0155; Unit Communication Error >> Notes
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DTC U0001-88; U0100; U0131; U0140; U0155; Unit Communication Error: Notes

WARNING: This page is about a different car, the 2017 Mazda 3. However, it is still accessible from the selected car via links, so may be relevant.
DETECTION CONDITION & POSSIBLE CAUSE

Description U0001:88
  • Unit communication error (HS-CAN)

U0100:00
  • Communication error with PCM

U0131:00
  • Communication error with electric power steering (EPS) control module

U0140:00
  • Communication error with front body control module (FBCM)

U0155:00
  • Communication error with instrument cluster
Detection condition
  • U0001:88
    • The adaptive front lighting system (AFS) control module detected CAN bus communication line (HS-CAN) malfunction ten times continuously.
  • U0100:00
    • The adaptive front lighting system (AFS) control module could not receive CAN signal from the PCM for 5 s or more.
  • U0131:00
    • The adaptive front lighting system (AFS) control module could not receive CAN signal from the electric power steering (EPS) control module for 5 s or more.
  • U0140:00
    • The adaptive front lighting system (AFS) control module could not receive CAN signal from the front body control module (FBCM) for 5 s or more.
  • U0155:00
    • The adaptive front lighting system (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 adaptive front lighting system (AFS) control module
  • Malfunction in CAN communication line between electric power steering (EPS) control module and adaptive front lighting system (AFS) control module
  • Malfunction in CAN communication line between front body control module (FBCM) and adaptive front lighting system (AFS) control module
  • Malfunction in CAN communication line between instrument cluster and adaptive front lighting system (AFS) control module
System wiring diagram Not applicable
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