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SECURITY LIGHT: DTC 11 (WDS: DTC B1681)

id0902e4632100

DTC 11 (B1681) | Coil signal is not received.
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POSSIBLE CAUSE | • Defective wiring harness • Defective coil • Defective PCM

Diagnostic procedure

Step | Inspection | Action
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1 | INSPECT POWER SUPPLY CIRCUIT OF COIL • Disconnect the coil connector. • Turn the ignition switch to the ON position. • Measure voltage at terminal D of coil connector. • Is voltage more than 8 V? | Yes | Go to the next step.
No | Repair wiring harness.
2 | INSPECT WIRING HARNESS BETWEEN COIL AND GROUND • Turn the ignition switch to the LOCK position. • Inspect wiring harness between coil connector terminal C and ground for the following: - Short to power supply - Open circuit • Is wiring harness okay? | Yes | Go to the next step.
No | Repair wiring harness.
3 | INSPECT COIL INPUT SIGNAL CIRCUIT • Connect coil connector. • Turn the ignition switch to the ON position. • Measure voltage at terminal B of coil connector. • Is voltage more than 8 V? | Yes | Go to Step 5.
No | Go to the next step.
4 | INSPECT COIL INPUT SIGNAL CIRCUIT • Turn the ignition switch to the LOCK position. • Disconnect PCM connector. • Turn the ignition switch to the ON position. • Measure voltage at terminal 1AO of PCM connector. • Is voltage more than 8 V? | Yes | Replace PCM and reprogram immobilizer system. (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. • Disconnect coil and PCM connectors. • Is there continuity between coil connector terminal B and PCM connector terminal 1AO? | Yes | Go to the next step.
No | Repair wiring harness.
6 | INSPECT COIL INPUT SIGNAL CIRCUIT • Measure resistance between coil connector terminal B and ground. • Is resistance more than 10 kilohms? | Yes | Replace coil. (See COIL REMOVAL/INSTALLATION)
No | Repair wiring harness.
7 | INSPECT COIL OUTPUT SIGNAL CIRCUIT • Connect coil and PCM connectors. • Turn the ignition switch to the ON position. • Measure voltage at terminal A of coil connector. • Is voltage more than 8 V? | Yes | Replace 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 coil connector. • Turn the ignition switch to the ON position. • Measure voltage at terminal A of coil connector. • Is voltage more than 8 V? | Yes | Replace 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 PCM connector. • Is there continuity between coil connector terminal A and PCM connector terminal 1AS? | Yes | Go to the next step.
No | Repair wiring harness.
10 | INSPECT COIL OUTPUT SIGNAL CIRCUIT • Measure resistance between PCM connector terminal 1AS and ground. • Is resistance more than 10 kilohms? | Yes | Replace PCM and reprogram immobilizer system. (See IMMOBILIZER SYSTEM COMPONENT REPLACEMENT/KEY ADDITION AND CLEARING)
No | Repair wiring harness.