DTC U0079:00 [CONNECTIVITY MASTER UNIT (TYPE-B)]

id1602a9007400

Outline

System malfunction location

Unit communication error (HS-CAN)

Detection condition

•  The connectivity master unit (CMU) detects a CAN BUS communication line malfunction for 2.5 s or more.

Fail-safe

•  The connectivity master unit (CMU) is put in sleep mode and it does not launch.

Possible cause

•  Malfunction in CAN bus communication line

•  Connectivity master unit (CMU) malfunction

•  Gateway unit (GWU) malfunction

System wiring diagram

Not applicable

Connector diagram

Not applicable

System malfunction location	Unit communication error (HS-CAN)
Detection condition	• The connectivity master unit (CMU) detects a CAN BUS communication line malfunction for 2.5 s or more.
Fail-safe	• The connectivity master unit (CMU) is put in sleep mode and it does not launch.
Possible cause	• Malfunction in CAN bus communication line • Connectivity master unit (CMU) malfunction • Gateway unit (GWU) malfunction
System wiring diagram	Not applicable
Connector diagram	Not applicable

Diagnostic Procedure

• Perform an inspection in accordance with the multiplex communication system diagnostic procedure. (Refer to the [CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW] in the workshop manual)