DTC U0121:00 [APPROACHING VEHICLE AUDIBLE SYSTEM DEVICE]

id0902y0138200

Outline

System malfunction location

Communication error with electronically controlled brake unit

Detection condition

•  The approaching vehicle audible system device cannot receive CAN signal from the electronically controlled brake unit for 1 s or more.

Fail-safe

•  Approaching vehicle alert sound is generated at maximum volume

Possible cause

•  Malfunction in CAN communication line between electronically controlled brake unit and approaching vehicle audible system device

System wiring diagram

Not applicable

System malfunction location	Communication error with electronically controlled brake unit
Detection condition	• The approaching vehicle audible system device cannot receive CAN signal from the electronically controlled brake unit for 1 s or more.
Fail-safe	• Approaching vehicle alert sound is generated at maximum volume
Possible cause	• Malfunction in CAN communication line between electronically controlled brake unit and approaching vehicle audible system device
System wiring diagram	Not applicable

Diagnostic Procedure

• Perform an inspection in accordance with the multiplex communication system diagnostic procedure.(See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [L.H.D. (E)].) (See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [R.H.D.].)