SECURITY LIGHT 11, DTC B1681/P1260 [IMMOBILIZER SYSTEM (KEYLESS ENTRY SYSTEM)]

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DTC	Security light flashing pattern		11	No detected communication with coil antenna.
	M-MDS display	Instrument cluster	B1681
		PCM	P1260
POSSIBLE CAUSE				•  The coil antenna connector is pulled out •  Coil antenna malfunction •  Instrument cluster malfunction •  Related wiring harnesses malfunction

System wiring diagram

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Diagnostic Procedure

STEP	INSPECTION		ACTION
1	INSPECT COIL ANTENNA POWER SUPPLY SYSTEM •  Disconnect the coil antenna connector. •  Turn the ignition switch to the ON position. •  Measure the voltage at coil antenna terminal D. ―  Is the voltage 8 V or more?	Yes	Go to the next step.
		No	Repair the wiring harness.
2	INSPECT WIRING HARNESS BETWEEN COIL ANTENNA AND GROUND •  Turn the ignition switch to the LOCK position. •  Inspect the wiring harness between coil antenna terminal C and ground for the following: ―  Short to power supply ―  Open circuit •  Is the wiring harness normal?	Yes	Go to the next step.
		No	Repair the wiring harness.
3	INSPECT COIL ANTENNA INPUT SIGNAL CIRCUIT •  Connect the coil antenna connector. •  Turn the ignition switch to the ON position. •  Measure the voltage at coil antenna terminal B. ―  Is the voltage 8 V or more?	Yes	Go to Step 7.
		No	Go to the next step.
4	INSPECT COIL ANTENNA INPUT SIGNAL CIRCUIT •  Turn the ignition switch to the LOCK position. •  Disconnect the instrument cluster connector. •  Turn the ignition switch to the ON position. •  Measure the voltage at instrument cluster terminal 2S. ―  Is the voltage 8 V or more?	Yes	Replace the instrument cluster and perform the resetting procedure for the immobilizer system when replacing the instrument cluster. (See INSTRUMENT CLUSTER REMOVAL/INSTALLATION.) (See IMMOBILIZER SYSTEM-RELATED PARTS PROGRAMMING.)
		No	Go to the next step.
5	INSPECT COMMUNICATION CIRCUIT (INPUT) FOR CONTINUITY •  Turn the ignition switch to the LOCK position. •  Is there continuity between coil antenna terminal B and instrument cluster terminal 2S?	Yes	Go to the next step.
		No	Repair the wiring harness.
6	INSPECT COIL ANTENNA INPUT SIGNAL CIRCUIT •  Measure the resistance between coil antenna terminal B and ground. ―  Is the resistance 10 kilohms or more?	Yes	Replace the coil antenna. (See COIL ANTENNA REMOVAL/INSTALLATION.)
		No	Repair the wiring harness.
7	INSPECT COIL ANTENNA OUTPUT SIGNAL CIRCUIT •  Connect the coil antenna connector and the instrument cluster connector. •  Turn the ignition switch to the ON position. •  Measure the voltage at coil antenna terminal A. ―  Is the voltage 8 V or more?	Yes	Replace the coil antenna. (See COIL ANTENNA REMOVAL/INSTALLATION.)
		No	Go to the next step.
8	INSPECT COIL ANTENNA OUTPUT SIGNAL CIRCUIT •  Turn the ignition switch to the LOCK position. •  Disconnect the coil antenna connector. •  Turn the ignition switch to the ON position. •  Measure the voltage at coil antenna terminal A. ―  Is the voltage 8 V or more?	Yes	Replace the coil antenna. (See COIL ANTENNA REMOVAL/INSTALLATION.)
		No	Go to the next step.
9	INSPECT COMMUNICATION CIRCUIT (OUTPUT) FOR CONTINUITY •  Turn the ignition switch to the LOCK position. •  Disconnect the instrument cluster connector. •  Is there continuity between coil antenna terminal A and instrument cluster terminal 2Q?	Yes	Go to the next step.
		No	Repair the wiring harness.
10	INSPECT COIL ANTENNA OUTPUT SIGNAL CIRCUIT •  Measure the resistance between instrument cluster terminal 2Q and ground. ―  Is the resistance 10 kilohms or more?	Yes	Replace the instrument cluster and perform the resetting procedure for the immobilizer system when replacing the instrument cluster. (See INSTRUMENT CLUSTER REMOVAL/INSTALLATION.) (See IMMOBILIZER SYSTEM-RELATED PARTS PROGRAMMING.)
		No	Repair the wiring harness.