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Free to use workshop manual for your 2015+ Mk4 'ND' Mazda MX-5

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DTC U0001:88/U0100:00/U0121:00/U0155:00/U0214:00 [BLIND SPOT MONITORING (BSM) CONTROL MODULE]

Description	U0001:88 Unit communication error (MS-CAN) U0100:00 Communication error with PCM U0121:00 Communication error with DSC HU/CM U0155:00 Communication error with instrument cluster U0214:00 Communication error with start stop unit
Detection condition	U0001:88 Blind spot monitoring (BSM) control module (LH) detects a CAN bus communication line (MS-CAN) malfunction with the ignition switched ON (engine off or on). U0100:00 Blind spot monitoring (BSM) control module (LH) cannot receive the CAN signal from the PCM for 2 s or more with the ignition switched ON (engine off or on). U0121:00 Blind spot monitoring (BSM) control module (LH) cannot receive the CAN signal from the DSC HU/CM for 2 s or more with the ignition switched ON (engine off or on). U0155:00 Blind spot monitoring (BSM) control module (LH) cannot receive the CAN signal from the instrument cluster for 2 s or more with the ignition switched ON (engine off or on). U0214:00 Blind spot monitoring (BSM) control module (LH) cannot receive the CAN signal from the start stop unit for 2 s or more with the ignition switched ON (engine off or on).
Fail-safe	U0001:88 Blind spot monitoring (BSM) system is stopped. U0100:00 Blind spot monitoring (BSM) system is stopped. U0121:00 Blind spot monitoring (BSM) system is stopped. U0155:00 Blind spot monitoring (BSM) system is stopped. U0214:00 Blind spot monitoring (BSM) system is stopped.
Possible cause	Malfunction in CAN bus communication line Malfunction in CAN communication line between PCM and blind spot monitoring (BSM) control module (LH) Instrument cluster communication error (vehicle speed signal is not sent via instrument cluster from PCM) Malfunction in CAN communication line between DSC HU/CM and blind spot monitoring (BSM) control module (LH) Instrument cluster communication error (yaw rate signal is not sent via instrument cluster from DSC HU/CM) Malfunction in CAN communication line between instrument cluster and blind spot monitoring (BSM) control module (LH) Malfunction in CAN communication line between start stop unit and blind spot monitoring (BSM) control module (LH) Instrument cluster communication error (turn switch signal is not sent via instrument cluster from start stop unit)
System wiring diagram	Not applicable

Diagnostic Procedure

Perform the malfunction diagnosis according to the troubleshooting procedure for the multiplex communication system. (See FOREWORD.)

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