DTC B13C3:09 [ADVANCED KEYLESS ENTRY SYSTEM]

id0902p8027000

System malfunction location

LF control unit malfunction
Detection condition
•  The start stop unit detects that the LF State signal of the LF control unit is low for 5 s or more.
•  With the communication between the start stop unit and LF control unit being performed normally, there is no response from the LF control unit even though there is a signal transmission request from the start stop unit to the LF control unit, and the LF state signal becomes low.
Fail-safe
•  Inhibits the door lock/unlock control using the advanced keyless entry system.
Possible cause
•  LF control unit connector or terminal malfunction
•  Start stop unit connector or terminal malfunction
•  Short to ground in wiring harness between start stop unit terminal 2H and LF control unit terminal G (24-pin type)/K (28-pin type)
•  Open circuit in wiring harness between start stop unit terminal 2H and LF control unit terminal G (24-pin type)/K (28-pin type)
•  LF control unit malfunction
•  Start stop unit malfunction

Diagnostic Procedure

Step

Inspection

Action
1
INSPECT LF CONTROL UNIT CONNECTOR CONDITION
•  Switch the ignition to off.
•  Disconnect the negative battery cable.
•  Disconnect the LF control unit connector.
•  Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection.
•  Is the connector normal?
Yes
Go to the next step.
No
Repair or replace the connector, then go to Step 6.
2
INSPECT START STOP UNIT CONNECTOR CONDITION
•  Disconnect the start stop unit connector.
•  Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection.
•  Is the connector normal?
Yes
Go to the next step.
No
Repair or replace the connector, then go to Step 6.
3
INSPECT LF CONTROL UNIT CIRCUIT FOR SHORT TO GROUND
•  Verify that the start stop unit and LF control unit connectors are disconnected.
•  Inspect for continuity between LF control unit terminal G (24-pin type)/K (28-pin type) (vehicle wiring harness side) and body ground.
•  Is there continuity?
Yes
Repair or replace the wiring harness which is shorted to ground, then go to Step 6.
No
Go to the next step.
4
INSPECT LF CONTROL UNIT CIRCUIT FOR OPEN CIRCUIT
•  Verify that the start stop unit and LF control unit connectors are disconnected.
•  Inspect the wiring harness for continuity between start stop unit terminal 2H (vehicle wiring harness side) and LF control unit terminal G (24-pin type)/K (28-pin type) (vehicle wiring harness side).
•  Is there continuity?
Yes
Go to the next step.
No
Repair or replace the wiring harness which has an open circuit, then go to Step 6.
5
INSPECT LF CONTROL UNIT
•  Inspect the LF control unit.
•  Is the LF control unit normal?
Yes
Go to the next step.
No
Replace the LF control unit, then go to the next step.
(See LF CONTROL UNIT REMOVAL/INSTALLATION.)
6
VERIFY THAT REPAIRS HAVE BEEN COMPLETED
•  Reconnect all the disconnected connectors.
•  Reconnect the disconnected negative battery cable.
•  Clear DTCs for the advanced keyless entry system using the M-MDS.
•  Switch the ignition ON (engine off or on) and wait for 5 s or more.
•  Perform the advanced keyless entry system DTC inspection using the M-MDS.
•  Is DTC B13C3:09 displayed?
Yes
Repeat the inspection from Step 1.
•  If the malfunction recurs, replace the start stop unit, then go to the next step.
No
Go to the next step.
7
VERIFY IF OTHER DTCs DISPLAYED
•  Are any other DTCs displayed?
Yes
Repair the malfunctioning part according to the applicable DTC troubleshooting.
(See DTC TABLE [ADVANCED KEYLESS ENTRY SYSTEM].)
No
DTC troubleshooting completed.