DTC U2121:49 [BODY CONTROL MODULE (BCM)]

id0902r7097800

Outline

System malfunction location

Communication error with vehicle control module (VCM)

Detection condition

• The body control module (BCM) cannot receive CAN signal from the vehicle control module (VCM) for 5 s or more.

Fail-safe

Not applicable

Possible cause

• Body control module (BCM) malfunction

System wiring diagram

Not applicable

System malfunction location	Communication error with vehicle control module (VCM)
Detection condition	• The body control module (BCM) cannot receive CAN signal from the vehicle control module (VCM) for 5 s or more.
Fail-safe	Not applicable
Possible cause	• Body control module (BCM) malfunction
System wiring diagram	Not applicable

Diagnostic Procedure

Step

Inspection

Results

Action

1

INSPECT BODY CONTROL MODULE (BCM) FOR MALFUNCTION

•  Clear the DTC recorded in the memory.
(See CLEARING DTC.)

•  Switch the main power ON (READY off or on) and wait for 5 s or more.

•  Perform the DTC inspection for the body control module (BCM).
(See DTC INSPECTION.)

•  Is the same Pending DTC present?

Yes

Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error.

(See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [L.H.D. (E)].)

(See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [R.H.D.].)

If the CAN communication is normal, replace the body control module (BCM) and perform the repair completion verification.

(See BODY CONTROL MODULE (BCM) REMOVAL/INSTALLATION.)

No

Go to the next step.

Repair completion verification

VERIFY IF OTHER DTC IS DISPLAYED

•  Perform the DTC inspection.
(See DTC INSPECTION.)

•  Are any other DTCs displayed?

Yes

Repair the malfunctioning location according to the applicable DTC troubleshooting.

No

DTC troubleshooting completed.

Step	Inspection	Results	Action
1	INSPECT BODY CONTROL MODULE (BCM) FOR MALFUNCTION • Clear the DTC recorded in the memory. (See CLEARING DTC.) • Switch the main power ON (READY off or on) and wait for 5 s or more. • Perform the DTC inspection for the body control module (BCM). (See DTC INSPECTION.) • Is the same Pending DTC present?	Yes	Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error. (See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [L.H.D. (E)].) (See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [R.H.D.].) If the CAN communication is normal, replace the body control module (BCM) and perform the repair completion verification. (See BODY CONTROL MODULE (BCM) REMOVAL/INSTALLATION.)
1		No	Go to the next step.
Repair completion verification	VERIFY IF OTHER DTC IS DISPLAYED • Perform the DTC inspection. (See DTC INSPECTION.) • Are any other DTCs displayed?	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting.
Repair completion verification		No	DTC troubleshooting completed.