DTC U0401:68 [REAR VEHICLE MONITORING SYSTEM]


id0902z2885600

Description

Error signal received from PCM

Detection condition
•  Rear vehicle monitoring control module (LH) receives the error signal from the PCM for 2 s or more.
Fail-safe function
•  Inhibits the rear vehicle monitoring system.
Possible cause
•  DTCs are stored in the PCM.
•  DTCs are stored in the instrument cluster.
•  Instrument cluster malfunction
•  PCM malfunction
•  Rear vehicle monitoring control module (LH) malfunction
System wiring diagram
Not applicable

Diagnostic Procedure

Step

Inspection

Action

1
VERIFY PCM DTCs
•  Are any DTCs displayed?
Yes
Repair or replace the malfunctioning part according to the applicable DTC troubleshooting.
No
Go to the next step.
2
VERIFY INSTRUMENT CLUSTER DTCs
•  Retrieve the instrument cluster DTCs using the M-MDS.
•  Are any DTCs displayed?
Yes
Repair or replace the malfunctioning part according to the applicable DTC troubleshooting.
No
Go to the next step.
3
INSPECT INSTRUMENT CLUSTER
•  Inspect the instrument cluster.
•  Is the instrument cluster normal?
Yes
Go to the next step.
No
Replace the instrument cluster, then go to Step 5.
4
PERFORM DTC INSPECTION AND VERIFY PCM MALFUNCTION
•  Clear the DTC for the rear vehicle monitoring control module using the M-MDS.
•  Switch the ignition ON (engine off or on) and wait for 3.5 s or more.
•  Retrieve the rear vehicle monitoring control module DTCs using the M-MDS.
•  Is the same DTC displayed?
Yes
Replace the PCM, then go to the next step.
No
Go to Step 6.
5
VERIFY THAT REPAIRS HAVE BEEN COMPLETED
•  Clear the DTC for the rear vehicle monitoring control module using the M-MDS.
•  Switch the ignition ON (engine off or on) and wait for 3.5 s or more.
•  Retrieve the rear vehicle monitoring control module DTCs using the M-MDS.
•  Is the same DTC displayed?
Yes
Repeat the inspection from Step 1.
•  If the malfunction recurs, replace the rear vehicle monitoring control module (LH).
Go to the next step.
No
Go to the next step.
6
VERIFY IF OTHER DTCs DISPLAYED
•  Are any other DTCs displayed?
Yes
Repair or replace the malfunctioning part according to the applicable DTC troubleshooting.
No
DTC troubleshooting completed.