DTC B11FD:1F [ADVANCED KEYLESS ENTRY SYSTEM]

id0902p8026700

Description

Keyless antenna (exterior, LF) circuit malfunction

Detection condition

•  Start stop unit detects an open circuit or short to ground in the keyless antenna (exterior, LF) circuit with the ignition switched off.

Fail-safe function

•  Inhibits the door lock/unlock control using the advanced keyless entry system.

Possible cause

•  Front outer handle (LH) connector or terminal malfunction

•  LF control unit connector or terminal malfunction

•  Short to ground in wiring harness between the following terminals:

―  LF control unit terminal O—Front outer handle (LH) terminal B

―  LF control unit terminal Q—Front outer handle (LH) terminal E

•  Open circuit in wiring harness between the following terminals:

―  LF control unit terminal O—Front outer handle (LH) terminal B

―  LF control unit terminal Q—Front outer handle (LH) terminal E

•  Keyless antenna (exterior, LF) malfunction

•  LF control unit malfunction

•  Start stop unit malfunction

Description	Keyless antenna (exterior, LF) circuit malfunction
Detection condition	• Start stop unit detects an open circuit or short to ground in the keyless antenna (exterior, LF) circuit with the ignition switched off.
Fail-safe function	• Inhibits the door lock/unlock control using the advanced keyless entry system.
Possible cause	• Front outer handle (LH) connector or terminal malfunction • LF control unit connector or terminal malfunction • Short to ground in wiring harness between the following terminals: ― LF control unit terminal O—Front outer handle (LH) terminal B ― LF control unit terminal Q—Front outer handle (LH) terminal E • Open circuit in wiring harness between the following terminals: ― LF control unit terminal O—Front outer handle (LH) terminal B ― LF control unit terminal Q—Front outer handle (LH) terminal E • Keyless antenna (exterior, LF) malfunction • LF control unit malfunction • Start stop unit malfunction

Diagnostic Procedure

Step	Inspection		Action
1	INSPECT FRONT OUTER HANDLE (LH) CONNECTOR CONDITION • Switch the ignition off. • Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 1.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 2.2].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [MZR 1.6].) • Disconnect the front outer handle (LH) 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.
1		No	Repair or replace the connector, then go to Step 7.
2	INSPECT LF CONTROL UNIT CONNECTOR CONDITION • 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.
2		No	Repair or replace the connector, then go to Step 7.
3	INSPECT FOR SHORT TO GROUND IN KEYLESS ANTENNA (EXTERIOR, LF) CIRCUIT • Verify that the LF control unit and front outer handle (LH) connectors are disconnected. • Inspect for continuity between the following terminals (wiring harness-side) and body ground: ― Front outer handle (LH) terminal B ― Front outer handle (LH) terminal E • Is there continuity?	Yes	Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals: • LF control unit terminal O—Front outer handle (LH) terminal B • LF control unit terminal Q—Front outer handle (LH) terminal E 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 short to ground. • Repair or replace the malfunctioning part. If there is no common connector: • Repair or replace the wiring harness which has a short to ground. Go to Step 7.
3		No	Go to the next step.
4	INSPECT FOR OPEN CIRCUIT IN KEYLESS ANTENNA (EXTERIOR, LF) CIRCUIT • Verify that the LF control unit and front outer handle (LH) connectors are disconnected. • Inspect for continuity between the following terminals (wiring harness-side): ― LF control unit terminal O—Front outer handle (LH) terminal B ― LF control unit terminal Q—Front outer handle (LH) terminal E • Is there continuity?	Yes	Go to the next step.
4		No	Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals: • LF control unit terminal O—Front outer handle (LH) terminal B • LF control unit terminal Q—Front outer handle (LH) terminal E 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 an open circuit. • Repair or replace the malfunctioning part. If there is no common connector: • Repair or replace the wiring harness which has an open circuit. Go to Step 7.
5	PERFORM DTC INSPECTION AND VERIFY KEYLESS ANTENNA (EXTERIOR, LF) MALFUNCTION • Always reconnect all disconnected connectors. • Reconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 1.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 2.2].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [MZR 1.6].) • Clear the DTC for the advanced keyless entry system using the M-MDS. (See CLEARING DTC [ADVANCED KEYLESS ENTRY SYSTEM].) • Perform the following work: ― Switch the ignition off. ― Open the front door (driver’s side). ― Close all the doors and trunk (4SD)/liftgate (5HB). • Retrieve the advanced keyless entry system DTCs using the M-MDS. (See DTC INSPECTION [ADVANCED KEYLESS ENTRY SYSTEM].) • Is the same DTC displayed?	Yes	Replace the front outer handle (LH), then go to the next step. (See FRONT OUTER HANDLE REMOVAL/INSTALLATION.)
5		No	Go to Step 8.
6	PERFORM DTC INSPECTION AND VERIFY LF CONTROL UNIT MALFUNCTION • Clear the DTC for the advanced keyless entry system using the M-MDS. (See CLEARING DTC [ADVANCED KEYLESS ENTRY SYSTEM].) • Perform the following work: ― Switch the ignition off. ― Open the front door (driver’s side). ― Close all the doors and trunk (4SD)/liftgate (5HB). • Retrieve the advanced keyless entry system DTCs using the M-MDS. (See DTC INSPECTION [ADVANCED KEYLESS ENTRY SYSTEM].) • Is the same DTC displayed?	Yes	Replace the LF control unit, then go to the next step. (See LF CONTROL UNIT REMOVAL/INSTALLATION.)
6		No	Go to Step 8.
7	VERIFY THAT REPAIRS HAVE BEEN COMPLETED • Always reconnect all disconnected connectors. • Reconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 1.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 2.2].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [MZR 1.6].) • Clear the DTC for the advanced keyless entry system using the M-MDS. (See CLEARING DTC [ADVANCED KEYLESS ENTRY SYSTEM].) • Perform the following work: ― Switch the ignition off. ― Open the front door (driver’s side). ― Close all the doors and trunk (4SD)/liftgate (5HB). • Retrieve the advanced keyless entry system DTCs using the M-MDS. (See DTC INSPECTION [ADVANCED KEYLESS ENTRY SYSTEM].) • Is the same DTC displayed?	Yes	Repeat the inspection from Step 1. • If the malfunction recurs, replace the start stop unit. (See START STOP UNIT REMOVAL/INSTALLATION.) Go to the next step.
7		No	Go to the next step.
8	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].)
8		No	DTC troubleshooting completed.