DTC B13C3:16 [ADVANCED KEYLESS ENTRY SYSTEM]

id0902p8027100

Description

LF control unit power supply voltage low input
Detection condition
•  Start stop unit power supply circuit 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 function
•  Inhibits the door lock/unlock control using the advanced keyless entry system.
Possible cause
•  LF control unit connector or terminal malfunction
•  Malfunction between battery positive terminal and LF control unit terminal B
•  LF control unit malfunction
•  Start stop unit malfunction

Diagnostic Procedure

Step

Inspection

Action
1
INSPECT LF CONTROL UNIT CONNECTOR CONDITION
•  Switch the ignition 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
VERIFY LF CONTROL UNIT POWER SUPPLY VOLTAGE
•  Always reconnect all disconnected connectors.
•  Reconnect the negative battery cable.
•  Measure the voltage at the LF control unit terminal B (wiring harness-side).
•  Is the voltage 5 V or more or less than 8.5 V?
Yes
Refer to the wiring diagram and verify whether or not there is a common connector between battery positive terminal and LF control unit terminal B.
If there is a common connector:
•  Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a malfunction.
•  Repair or replace the malfunctioning part.
If there is no common connector:
•  Inspect the wiring harness between battery positive terminal and LF control unit terminal B.
―  If there is any malfunction:
•  Repair or replace the wiring harness.
―  If there is no malfunction:
•  Replace the LF control unit.
Go to Step 4.
No
Go to the next step.
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
•  Always reconnect all disconnected connectors.
•  Reconnect the negative battery cable.
•  Clear the DTC for the advanced keyless entry system using the M-MDS.
•  Switch the ignition ON (engine off) and wait for 5 s or more.
•  Retrieve the advanced keyless entry system DTCs using the M-MDS.
•  Is the same DTC displayed?
Yes
Repeat the inspection from Step 1.
•  If the malfunction recurs, replace the start stop unit.
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.
(See DTC TABLE [ADVANCED KEYLESS ENTRY SYSTEM].)
No
DTC troubleshooting completed.