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SECURITY LIGHT: 11, DTC B1681/P1260

BHE090201077W06

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

## Diagnostic Procedure

STEP | INSPECTION | ACTION
--- | --- | ---
1 | INSPECT COIL POWER SUPPLY SYSTEM • Disconnect the coil connector. • Turn the ignition switch to the ON position. • Measure the voltage at coil connector 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 AND GROUND • Turn the ignition switch to the LOCK position. • Inspect the wiring harness between coil connector 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 INPUT SIGNAL CIRCUIT • Connect the coil connector. • Turn the ignition switch to the ON position. • Measure the voltage at coil connector terminal B. – Is the voltage 8 V or more? | Yes | Go to Step 7.
No | Go to the next step.
4 | INSPECT COIL INPUT SIGNAL CIRCUIT • Turn the ignition switch to the LOCK position. • Disconnect the keyless unit connector. • Turn the ignition switch to the ON position. • Measure the voltage at keyless unit connector terminal 3E. – Is the voltage 8 V or more? | Yes | Replace the keyless unit and perform procedures for when replacing the keyless unit only. (See KEYLESS UNIT REMOVAL/INSTALLATION.) (See IMMOBILIZER SYSTEM COMPONENT REPLACEMENT/KEY ADDITION AND CLEARING.)
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 connector terminal B and keyless unit connector terminal 3E? | Yes | Go to the next step.
No | Repair the wiring harness.
6 | INSPECT COIL INPUT SIGNAL CIRCUIT • Measure the resistance between coil connector terminal B and ground. – Is the resistance 10 kilohms or more? | Yes | Replace the coil. (See COIL REMOVAL/INSTALLATION.)
No | Repair the wiring harness.
7 | INSPECT COIL OUTPUT SIGNAL CIRCUIT • Connect the coil connector and the keyless unit connector. • Turn the ignition switch to the ON position. • Measure the voltage at coil connector terminal A. – Is the voltage 8 V or more? | Yes | Replace the coil. (See COIL REMOVAL/INSTALLATION.)
No | Go to the next step.
8 | INSPECT COIL OUTPUT SIGNAL CIRCUIT • Turn the ignition switch to the LOCK position. • Disconnect the coil connector. • Turn the ignition switch to the ON position. • Measure the voltage at coil connector terminal A. – Is the voltage 8 V or more? | Yes | Replace the coil. (See COIL 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 keyless unit connector. • Is there continuity between coil connector terminal A and keyless unit connector terminal 3F? | Yes | Repair the wiring harness.
No | Go to the next step.
10 | INSPECT COIL OUTPUT SIGNAL CIRCUIT • Measure the resistance between keyless unit connector terminal 3F and ground. – Is the resistance 10 kilohms or more? | Yes | Replace the keyless unit and perform procedures for when replacing the keyless unit only. (See KEYLESS UNIT REMOVAL/INSTALLATION.) (See IMMOBILIZER SYSTEM COMPONENT REPLACEMENT/KEY ADDITION AND CLEARING.)
No | Repair the wiring harness.