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

id0902e5800600

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

amxzzw00000586

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.