DTC B13AF:62 [FRONT BODY CONTROL MODULE (FBCM)]

id0902p2008200

System malfunction location

Headlight LO signal mismatch
Detection condition
•  The condition in which the CAN and module signals are compared and no match is detected between the signals for 5 s or more with the ignition switched ON (engine off or on).
Fail-safe
—
Possible cause
•  Start stop unit malfunction
•  Light switch malfunction
•  Front body control module (FBCM) malfunction
•  Short circuit to ground in wiring harness between start stop unit and front body control module (FBCM)
•  Open circuit in wiring harness between start stop unit and front body control module (FBCM)
•  Short circuit to power supply in wiring harness between start stop unit and front body control module (FBCM)

Diagnostic Procedure

Step

Inspection

Action
1
INSPECT IF MALFUNCTION CAUSE IS START STOP UNIT OR FRONT BODY CONTROL MODULE (FBCM)
•  Display start stop unit PID H/L_SW_LOW using the M-MDS.
•  Verify the PID while operating the light switch.
•  Is the display of PID H/L_SW_LOW normal?
Yes
Go to Step 3.
No
Go to the next step.
2
INSPECT LIGHT SWITCH
•  Inspect the light switch.
•  Is the light switch normal?
Yes
Replace the start stop unit, then go to Step 7.
(See START STOP UNIT REMOVAL/INSTALLATION.)
No
Replace the light switch, then go to Step 7.
(See LIGHT SWITCH REMOVAL/INSTALLATION.)
3
INSPECT IF MALFUNCTION CAUSE IS FRONT BODY CONTROL MODULE (FBCM) OR WIRING HARNESS
•  Display front body control module (FBCM) PID H/L_SW_LOW1 using the M-MDS.
•  Verify the PID while operating the light switch.
•  Is the display of PID H/L_SW_LOW1 normal?
Yes
Go to the next step.
No
•  Perform the CAN malfunction diagnosis flow and inspect the CAN for a malfunction.
•  If there is no malfunction in CAN, replace the front body control module (FBCM), then go to Step 7.
4
INSPECT FOR SHORT TO GROUND BETWEEN LIGHT SWITCH AND FRONT BODY CONTROL MODULE (FBCM)
•  Switch the light switch off.
•  Inspect for continuity between front body control module (FBCM) terminal 2W and body ground.
•  Is there continuity?
Yes
Repair or replace the wiring harness, then go to Step 7.
No
Go to the next step.
5
INSPECT WIRING HARNESS BETWEEN LIGHT SWITCH AND FRONT BODY CONTROL MODULE (FBCM) FOR OPEN CIRCUIT
•  Disconnect the front body control module (FBCM) connector.
•  Disconnect the start stop unit connector.
•  Inspect for continuity between front body control module (FBCM) terminal 2W and start stop unit terminal 1X.
•  Is there continuity?
Yes
Go to the next step.
No
Repair or replace the wiring harness, then go to Step 7.
6
INSPECT FOR SHORT TO POWER SUPPLY BETWEEN LIGHT SWITCH AND FRONT BODY CONTROL MODULE (FBCM)
•  Verify that the start stop unit and front body control module (FBCM) connectors are disconnected.
•  Connect the negative battery cable.
•  Switch the ignition ON (engine off or on).
•  Measure the voltage at front body control module (FBCM) terminal 2W.
•  Is the voltage 0 V?
Yes
Go to the next step.
No
Repair or replace the wiring harness and go to the next step.
7
VERIFY THAT REPAIRS HAVE BEEN COMPLETED
•  Clear front body control module (FBCM) DTCs using the M-MDS.
•  Switch the ignition ON (engine off or on) and wait for 5 s or more.
•  Perform the front body control module (FBCM) DTC inspection using the M-MDS.
•  Is DTC B13AF:62 displayed?
Yes
Replace the front body control module (FBCM), then go to the next step.
(See FRONT BODY CONTROL MODULE (FBCM) REMOVAL/INSTALLATION.)
No
Go to the next step.
8
VERIFY IF OTHER DTCs DISPLAYED
•  Are any other DTCs displayed?
Yes
Repair the malfunctioning part according to the applicable DTC troubleshooting.
(See DTC TABLE [FRONT BODY CONTROL MODULE (FBCM)].)
No
DTC troubleshooting completed.