DTC U0121:87 [BODY CONTROL MODULE (BCM)]

id0902r7096000

Outline

System malfunction location

Communication error with electronically controlled brake unit

Detection condition

•  The body control module (BCM) cannot receive CAN signal from the electronically controlled brake unit.

Fail-safe

•  Cancel the i-stop control.

Possible cause

•  Malfunction in CAN communication line between electronically controlled brake unit and body control module (BCM)

System wiring diagram

Not applicable

System malfunction location	Communication error with electronically controlled brake unit
Detection condition	• The body control module (BCM) cannot receive CAN signal from the electronically controlled brake unit.
Fail-safe	• Cancel the i-stop control.
Possible cause	• Malfunction in CAN communication line between electronically controlled brake unit and body control module (BCM)
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.)