DTC B10C9:1F [ADVANCED KEYLESS ENTRY SYSTEM]

id0902p8026300

System malfunction location

Keyless antenna (interior, front) circuit malfunction

Detection condition

•  The start stop unit detects an open circuit in the keyless antenna (interior, front) or a short to ground with the ignition switched off.

Fail-safe

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

Possible cause

•  Keyless antenna (interior, front) connector or terminal malfunction

•  LF control unit connector or terminal malfunction

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

―  Between LF control unit terminal K (24-pin type)/O (28-pin type) and keyless antenna (interior, front) terminal B

―  Between LF control unit terminal M (24-pin type)/Q (28-pin type) and keyless antenna (interior, front) terminal A

•  Open circuit in wiring harness between the following terminals:

―  Between LF control unit terminal K (24-pin type)/O (28-pin type) and keyless antenna (interior, front) terminal B

―  Between LF control unit terminal M (24-pin type)/Q (28-pin type) and keyless antenna (interior, front) terminal A

•  LF control unit malfunction

•  Keyless antenna (interior, front) malfunction

•  Start stop unit malfunction

System malfunction location	Keyless antenna (interior, front) circuit malfunction
Detection condition	• The start stop unit detects an open circuit in the keyless antenna (interior, front) or a short to ground with the ignition switched off.
Fail-safe	• Inhibits the door lock/unlock control using the advanced keyless entry system.
Possible cause	• Keyless antenna (interior, front) connector or terminal malfunction • LF control unit connector or terminal malfunction • Short to ground in wiring harness between the following terminals: ― Between LF control unit terminal K (24-pin type)/O (28-pin type) and keyless antenna (interior, front) terminal B ― Between LF control unit terminal M (24-pin type)/Q (28-pin type) and keyless antenna (interior, front) terminal A • Open circuit in wiring harness between the following terminals: ― Between LF control unit terminal K (24-pin type)/O (28-pin type) and keyless antenna (interior, front) terminal B ― Between LF control unit terminal M (24-pin type)/Q (28-pin type) and keyless antenna (interior, front) terminal A • LF control unit malfunction • Keyless antenna (interior, front) malfunction • Start stop unit malfunction

Diagnostic Procedure

Step	Inspection		Action
1	INSPECT KEYLESS ANTENNA (INTERIOR, FRONT) CONNECTOR CONDITION • Switch the ignition to off. • Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5 (WITHOUT i-stop)].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 2.2].) • Disconnect the keyless antenna (interior, front) 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 KEYLESS ANTENNA (INTERIOR, FRONT) CIRCUIT FOR SHORT TO GROUND • Verify that the LF control unit and keyless antenna (interior, front) connectors are disconnected. • Inspect for continuity between the following terminals (vehicle wiring harness side) and body ground. ― Keyless antenna (interior, front) terminal B ― Keyless antenna (interior, front) terminal A • Is there continuity?	Yes	Repair or replace the wiring harness which is shorted to ground, then go to Step 7.
3		No	Go to the next step.
4	INSPECT KEYLESS ANTENNA (INTERIOR, FRONT) CIRCUIT FOR OPEN CIRCUIT • Verify that the LF control unit and keyless antenna (interior, front) connectors are disconnected. • Inspect the wiring harness between the following terminals (vehicle wiring harness side) for continuity. ― Between LF control unit terminal K (24-pin type)/O (28-pin type) and keyless antenna (interior, front) terminal B ― Between LF control unit terminal M (24-pin type)/Q (28-pin type) and keyless antenna (interior, front) terminal A • Is there continuity?	Yes	Go to the next step.
4		No	Repair or replace the wiring harness which has an open circuit, then go to Step 7.
5	INSPECT LF CONTROL UNIT • Inspect the LF control unit. (See LF CONTROL UNIT INSPECTION.) • Is the LF control unit normal?	Yes	Go to the next step.
5		No	Replace the LF control unit, then go to Step 7. (See LF CONTROL UNIT REMOVAL/INSTALLATION.)
6	PERFORM DTC INSPECTION AND VERIFY IF MALFUNCTIONING PART IS KEYLESS ANTENNA (INTERIOR, FRONT) • Reconnect all the disconnected connectors. • Reconnect the disconnected negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5 (WITHOUT i-stop)].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 2.2].) • Clear DTCs for the advanced keyless entry system using the M-MDS. (See CLEARING DTC [ADVANCED KEYLESS ENTRY SYSTEM].) • Perform the advanced keyless entry system DTC inspection using the M-MDS. (See DTC INSPECTION [ADVANCED KEYLESS ENTRY SYSTEM].) • Is DTC B10C9:1F displayed?	Yes	Replace the keyless antenna (interior, front), then go to the next step. (See KEYLESS ANTENNA REMOVAL/INSTALLATION.)
6		No	Go to Step 8.
7	VERIFY THAT REPAIRS HAVE BEEN COMPLETED • Reconnect all the disconnected connectors. • Reconnect the disconnected negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5 (WITHOUT i-stop)].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 2.2].) • Clear DTCs for the advanced keyless entry system using the M-MDS. (See CLEARING DTC [ADVANCED KEYLESS ENTRY SYSTEM].) • Perform the advanced keyless entry system DTC inspection using the M-MDS. (See DTC INSPECTION [ADVANCED KEYLESS ENTRY SYSTEM].) • Is DTC B10C9:1F displayed?	Yes	Repeat the inspection from Step 1. • If the malfunction recurs, replace the start stop unit, then go to the next step. (See START STOP UNIT REMOVAL/INSTALLATION.)
7		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 [ADVANCED KEYLESS ENTRY SYSTEM].)
8		No	DTC troubleshooting completed.