DTC B10C9:1F [START STOP UNIT]

id0902p6019900

System malfunction location

Keyless antenna (interior, center) circuit malfunction

Detection condition

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

Fail-safe

—

Possible cause

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

•  Start stop unit connector or terminal malfunction

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

―  Start stop unit terminal 2I and keyless antenna (interior, center) terminal B

―  Start stop unit terminal 2K and keyless antenna (interior, center) terminal A

•  Open circuit in wiring harness between the following terminals:

―  Start stop unit terminal 2I and keyless antenna (interior, center) terminal B

―  Start stop unit terminal 2K and keyless antenna (interior, center) terminal A

•  Keyless antenna (interior, center) malfunction

•  Start stop unit malfunction

System malfunction location	Keyless antenna (interior, center) circuit malfunction
Detection condition	• The start stop unit detects an open circuit in the keyless antenna (interior, center) or a short to ground with the ignition switched off.
Fail-safe	—
Possible cause	• Keyless antenna (interior, center) connector or terminal malfunction • Start stop unit connector or terminal malfunction • Short to ground in wiring harness between the following terminals: ― Start stop unit terminal 2I and keyless antenna (interior, center) terminal B ― Start stop unit terminal 2K and keyless antenna (interior, center) terminal A • Open circuit in wiring harness between the following terminals: ― Start stop unit terminal 2I and keyless antenna (interior, center) terminal B ― Start stop unit terminal 2K and keyless antenna (interior, center) terminal A • Keyless antenna (interior, center) malfunction • Start stop unit malfunction

Diagnostic Procedure

Step	Inspection		Action
1	INSPECT KEYLESS ANTENNA (INTERIOR, CENTER) 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, center) 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 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.
2		No	Repair or replace the connector, then go to Step 6.
3	INSPECT KEYLESS ANTENNA (INTERIOR, CENTER) CIRCUIT FOR SHORT TO GROUND • Verify that the start stop unit and keyless antenna (interior, center) connectors are disconnected. • Inspect for continuity between the following terminals (vehicle wiring harness side) and body ground. ― Keyless antenna (interior, center) terminal B ― Keyless antenna (interior, center) terminal A • Is there continuity?	Yes	Repair or replace the wiring harness which is shorted to ground, then go to Step 6.
3		No	Go to the next step.
4	INSPECT KEYLESS ANTENNA (INTERIOR, CENTER) CIRCUIT FOR OPEN CIRCUIT • Verify that the start stop unit and keyless antenna (interior, center) connectors are disconnected. • Inspect the wiring harness between the following terminals (vehicle wiring harness side) for continuity. ― Start stop unit terminal 2I and keyless antenna (interior, center) terminal B ― Start stop unit terminal 2K and keyless antenna (interior, center) 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 6.
5	PERFORM DTC INSPECTION AND VERIFY IF MALFUNCTIONING PART IS KEYLESS ANTENNA (INTERIOR, CENTER) • 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 DTC for the start stop unit using the M-MDS. (See CLEARING DTC [START STOP UNIT].) • Perform the DTC inspection for the start stop unit using the M-MDS. (See DTC INSPECTION [START STOP UNIT].) • Is DTC B10C9:1F displayed?	Yes	Replace the keyless antenna (interior, center), then go to the next step. (See KEYLESS ANTENNA REMOVAL/INSTALLATION.)
5		No	Go to Step 7.
6	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 DTC for the start stop unit using the M-MDS. (See CLEARING DTC [START STOP UNIT].) • Perform the DTC inspection for the start stop unit using the M-MDS. (See DTC INSPECTION [START STOP UNIT].) • 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.)
6		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 [START STOP UNIT].)
7		No	DTC troubleshooting completed.