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

id09021h001600

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 • Keyless control module 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 keyless control module connector. • Turn the ignition switch to the ON position. • Measure the voltage at keyless control module terminal 3U. • Is the voltage 8 V or more? | Yes | Replace the keyless control module and perform the resetting procedure for the immobilizer system when replacing the keyless control module. (See KEYLESS CONTROL MODULE REMOVAL/INSTALLATION [ADVANCED KEYLESS ENTRY AND START SYSTEM].) (See IMMOBILIZER SYSTEM COMPONENT REPLACEMENT/KEY ADDITION AND CLEARING [ADVANCED KEYLESS ENTRY AND START 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 keyless control module terminal 3U? | 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 keyless control module 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 keyless control module connector. • Is there continuity between coil antenna terminal A and keyless control module terminal 3V? | Yes | Go to the next step.
No | Repair the wiring harness.
10 | INSPECT COIL ANTENNA OUTPUT SIGNAL CIRCUIT • Measure the resistance between keyless control module terminal 3V and ground. • Is the resistance 10 kilohms or more? | Yes | Replace the keyless control module and perform the resetting procedure for the immobilizer system when replacing the keyless control module. (See KEYLESS CONTROL MODULE REMOVAL/INSTALLATION [ADVANCED KEYLESS ENTRY AND START SYSTEM].) (See IMMOBILIZER SYSTEM COMPONENT REPLACEMENT/KEY ADDITION AND CLEARING [ADVANCED KEYLESS ENTRY AND START SYSTEM].)
No | Repair the wiring harness.