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2008 - MX-5 - Body and Accessories

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



DTC

Security light flashing pattern

11

Communication error between the keyless control module and the coil antenna

M-MDS display

Keyless control module

B1681

Instrument cluster

B1681

PCM

P1260

POSSIBLE CAUSE

  • Defective coil antenna

  • Defective keyless control module

  • Defective wiring harness


Diagnostic procedure

STEP

INSPECTION

ACTION

1

INSPECT POWER SUPPLY CIRCUIT OF COIL ANTENNA
  • Disconnect coil antenna connector.

  • Turn ignition switch to ON position.

  • Measure voltage at terminal D of coil antenna connector.

  • Is voltage more than 8 V?

Yes

Go to next step.

No

Repair wiring harness.

2

INSPECT WIRING HARNESS BETWEEN COIL ANTENNA AND GROUND
  • Turn ignition switch to LOCK position.

  • Inspect wiring harness between coil antenna terminal C and ground for following.

    • Short to power supply

    • Open circuit

  • Is wiring harness okay?

Yes

Go to next step.

No

Repair wiring harness.

3

INSPECT COIL ANTENNA INPUT SIGNAL CIRCUIT
  • Connect coil antenna connector.

  • Turn ignition switch to ON position.

  • Is there continuity between the following terminals?

    • 2Y—B

    • 2AA—A

Yes

Replace coil antenna, then go to the next step.

(See COIL ANTENNA REMOVAL/INSTALLATION [ADVANCED KEYLESS SYSTEM])

No

Repair wiring harness.

4

INSPECT KEYLESS CONTROL MODULE
  • Turn the ignition switch to the ON position.

  • Is the DTC displayed?

    • Security light: 11

    • M-MDS: B1681/B1681/P1260

Yes

Replace keyless control module, then go to the next step.

(See KEYLESS CONTROL MODULE REMOVAL/INSTALLATION [ADVANCED KEYLESS SYSTEM])

No

DTC troubleshooting completed.




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