DTC B11FD:1F [START STOP UNIT]

id0902p6026700

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	• Inhibits the door lock/unlock 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 • LF control unit malfunction • Keyless antenna (exterior, LF) 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 terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) • 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 KEYLESS ANTENNA (EXTERIOR, LF) CIRCUIT FOR SHORT TO GROUND • 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 KEYLESS ANTENNA (EXTERIOR, LF) CIRCUIT FOR OPEN 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	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	VERIFY IF MALFUNCTIONING LOCATION IS KEYLESS ANTENNA (EXTERIOR, LF) DEPENDING ON REPEATABILITY • Always reconnect all disconnected connectors. • Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) • Clear the DTC for the start stop unit using the M-MDS. (See CLEARING DTC [START STOP UNIT].) • Perform the following work: ? Switch the ignition off. ? Open the front door (LH). ? Close all the doors and liftgate. • Retrieve the start stop unit DTCs using the M-MDS. (See DTC INSPECTION [START STOP UNIT].) • Is the same DTC displayed?	Yes	Replace the front outer handle (LH), then go to the next step. (See FRONT OUTER HANDLE REMOVAL/INSTALLATION.)
6		No	Go to Step 8.
7	VERIFY THAT REPAIRS HAVE BEEN COMPLETED • Always reconnect all disconnected connectors. • Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) • Clear the DTC for the start stop unit using the M-MDS. (See CLEARING DTC [START STOP UNIT].) • Perform the following work: ? Switch the ignition off. ? Open the front door (LH). ? Close all the doors and liftgate. • Retrieve the start stop unit DTCs using the M-MDS. (See DTC INSPECTION [START STOP UNIT].) • 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 [START STOP UNIT].)
8		No	DTC troubleshooting completed.