SECURITY LIGHT: 11, DTC: B1681/P1260/P1260:00 [IMMOBILIZER SYSTEM (KEYLESS ENTRY SYSTEM)]

id0902e5001600

SECURITY LIGHT: 11 | No detected communication with the coil antenna
DTC: B1681/P1260/P1260:00
DETECTION CONDITION | No detected communication with the coil antenna
POSSIBLE CAUSE | • Coil antenna malfunction • Instrument cluster malfunction • Malfunction in the related wiring harnesses

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 OFF 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 OFF position. • Disconnect the instrument cluster connector. • Turn the ignition switch to the ON position. • Measure the voltage at instrument cluster terminal 1G. • 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 COMPONENT REPLACEMENT/KEY ADDITION AND CLEARING [KEYLESS ENTRY SYSTEM].)
No | Go to the next step.
5 | INSPECT COMMUNICATION CIRCUIT (INPUT) FOR CONTINUITY • Turn the ignition switch to the OFF position. • Is there continuity between coil antenna terminal B and instrument cluster terminal 1G? | 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 C 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 OFF 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 OFF position. • Disconnect the instrument cluster connector. • Is there continuity between coil antenna terminal A and instrument cluster terminal 1E? | 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 1E 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 COMPONENT REPLACEMENT/KEY ADDITION AND CLEARING [KEYLESS ENTRY SYSTEM].)
No | Repair the wiring harness.