DTC B13C3:16 [ADVANCED KEYLESS ENTRY SYSTEM]

id0902p8027100

System malfunction location

LF control unit power supply voltage decrease input
Detection condition
•  With the ignition switched ON (engine off), start stop unit power supply circuit (+B1) voltage of 8.5 V or more or less than 16.5 V and LF control unit power supply circuit voltage of 5 V or more or less than 8.5 V are detected for 5 s or more.
Fail-safe
•  Inhibits the door lock/unlock control using the advanced keyless entry system.
Possible cause
•  LF control unit connector or terminal malfunction
•  LF control unit power supply circuit malfunction
―  Short to ground in the wiring harness between ROOM 15 A fuse and LF control unit terminal B (24-pin type)/A (28-pin type)
―  ROOM 15 A fuse malfunction
―  Open circuit in wiring harness between battery positive terminal and LF control unit terminal B (24-pin type)/A (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 4.
2
INSPECT LF CONTROL UNIT POWER SUPPLY CIRCUIT
•  Verify that the LF control unit connector is disconnected.
•  Connect the negative battery cable.
•  Measure the voltage at LF control unit terminal B (24-pin type)/A (28-pin type) (vehicle wiring harness side).
•  Is the voltage B+?
Yes
Go to the next step.
No
Inspect the ROOM 15 A fuse.
•  If a fuse is burnt out:
―  Repair or replace the wiring harness which is shorted to ground.
―  Replace the fuse.
•  If a fuse is damaged:
―  Replace the fuse.
•  If the fuse is normal:
―  Repair or replace the wiring harness which has an open circuit.
Go to Step 4.
3
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.)
4
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) and wait for 5 s or more.
•  Perform the advanced keyless entry system DTC inspection using the M-MDS.
•  Is DTC B13C3:16 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.
5
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.