DTC U0599:68 [FRONT BODY CONTROL MODULE (FBCM)]


id0902p2010900

Description

Error signal received from DC-DC converter

Detection condition
•  Front body control module (FBCM) receives error signals from the DC-DC converter for 5 s or more with the ignition switched ON (engine off or on).
Fail-safe function
Not applicable
Possible cause
•  DC-DC converter malfunction
•  Front body control module (FBCM) malfunction
System wiring diagram
Not applicable

Diagnostic Procedure

Step

Inspection

Action

1
VERIFY FRONT BODY CONTROL MODULE (FBCM) DTCs AGAIN
•  Clear the DTC for the front body control module (FBCM) using the M-MDS.
•  Switch the ignition ON (engine off or on) and wait for 5 s or more.
•  Retrieve the front body control module (FBCM) DTCs using the M-MDS.
•  Is the same DTC displayed?
Yes
Go to the next step.
No
Go to Step 5.
2
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.
3
INSPECT DC-DC CONVERTER
•  Is the DC-DC converter normal?
Yes
Go to the next step.
No
Replace the DC-DC converter, then go to the next step.
4
VERIFY THAT REPAIRS HAVE BEEN COMPLETED
•  Clear the DTC for the front body control module (FBCM) using the M-MDS.
•  Switch the ignition ON (engine off or on) and wait for 5 s or more.
•  Retrieve the front body control module (FBCM) DTCs using the M-MDS.
•  Is the same DTC displayed?
Yes
Repeat the inspection from Step 1.
•  If the malfunction recurs, replace the front body control module (FBCM).
Go to the next step.
No
Go to the next step.
5
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.