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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/U0101:00/U0121:00/U0151:00/U0155:00/U0214:00/U023A:00 [BCM]

Description	U0001:88 Module communication error (HS-CAN) U0100:00 Communication error with PCM U0101:00 Communication error with TCM U0121:00 Communication error with DSC HU/CM U0151:00 Communication error with SAS control module U0155:00 Communication error with instrument cluster U0214:00 Communication error with start stop unit U023A:00 Communication error with forward sensing camera (FSC)
Detection condition	U0001:88 BCM detects the CAN bus communication line (HS-CAN) malfunction 10 times continuously with the ignition switched ON (engine off or on). U0100:00 BCM could not receive the CAN signal from the PCM for 5 s or more with the ignition switched ON (engine off or on). U0101:00 BCM could not receive the CAN signal from the TCM for 5 s or more with the ignition switched ON (engine off or on). U0121:00 BCM could not receive the CAN signal from the DSC HU/CM for 5 s or more with the ignition switched ON (engine off or on). U0151:00 BCM could not receive the CAN signal from the SAS control module for 5 s or more with the ignition switched ON (engine off or on). U0155:00 BCM could not receive the CAN signal from the instrument cluster for 5 s or more with the ignition switched ON (engine off or on). U0214:00 BCM could not receive the CAN signal from the start stop unit for 5 s or more with the ignition switched ON (engine off or on). U023A:00 BCM could not receive the CAN signal from the forward sensing camera (FSC) for 5 s or more with the ignition switched ON (engine off or on).
Fail-safe	U0001:88 Exterior lighting system Turn the TNS (parking lights) and headlights LO on, and turn off other exterior light controls. Auto light system Continue the controls prior to the auto light malfunction detection. Interior light control system Continue the controls prior to the interior light malfunction detection for 5 s and turn the light on using the initial value after 5 s have elapsed. Wiper system Continue the controls prior to the wiper malfunction detection. Washer system Stop the washer control. Auto wiper system Continue the controls prior to the wiper malfunction detection. Blower system BCM power supply condition is on: Turn the blower relay on. BCM power supply condition is off: Turn the blower relay off. U0100:00 Auto light system Continue the controls prior to the auto light malfunction detection. Auto wiper system Continue the controls prior to the wiper malfunction detection. U0101:00 Not applicable U0121:00 Not applicable U0151:00 Not applicable U0155:00 Interior light control system Continue the controls prior to the interior light malfunction detection for 5 s and turn the light on using the initial value after 5 s have elapsed. Blower system BCM power supply condition is on: Turn the blower relay on. BCM power supply condition is off: Turn the blower relay off. U0214:00 Exterior lighting system Turn the TNS (parking lights) and headlights LO on, and turn off other exterior light controls. Auto light system Continue the controls prior to the auto light malfunction detection. Wiper system Continue the controls prior to the wiper malfunction detection. Washer system Stop the washer control. Auto wiper system Continue the controls prior to the wiper malfunction detection. U023A:00 Not applicable
Possible cause	Malfunction in CAN bus communication line Malfunction in CAN line between PCM and BCM Malfunction in CAN line between TCM and BCM Malfunction in CAN line between DSC HU/CM and BCM Malfunction in CAN line between SAS control module and BCM Malfunction in CAN line between instrument cluster and BCM Malfunction in CAN line between start stop unit and BCM Malfunction in CAN line between forward sensing camera (FSC) and BCM
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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