DTC U2121:00 [CONNECTIVITY MASTER UNIT]

id1602a1021100

Outline

System malfunction location

Communication error with vehicle control module (VCM)

Detection condition

•  The connectivity master unit (CMU) detects a communication interruption or communication error with the vehicle control module (VCM) for approx. 6 s.

Fail-safe

Not applicable

Possible cause

•  Malfunction in CAN bus communication line

•  Vehicle control module (VCM) malfunction

•  Connectivity master unit (CMU) malfunction

System wiring diagram

Not applicable

System malfunction location	Communication error with vehicle control module (VCM)
Detection condition	• The connectivity master unit (CMU) detects a communication interruption or communication error with the vehicle control module (VCM) for approx. 6 s.
Fail-safe	Not applicable
Possible cause	• Malfunction in CAN bus communication line • Vehicle control module (VCM) malfunction • Connectivity master unit (CMU) malfunction
System wiring 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)