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2008 - MX-5 - Body and Accessories

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



SECURITY LIGHT: 11

No detected communication with the coil antenna

DTC: B1681/P1260

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 LOCK 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 LOCK position.

  • Disconnect the instrument cluster connector.

  • Turn the ignition switch to the ON position.

  • Measure the voltage at instrument cluster terminal 2S.

    • 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 LOCK position.

  • Is there continuity between coil antenna terminal B and instrument cluster terminal 2S?

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 B and ground.

    • Is the resistance 10 kilohms or more?

Yes

Replace the coil antenna.

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

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 [KEYLESS ENTRY SYSTEM].)

No

Go to the next step.

8

    INSPECT COIL ANTENNA OUTPUT SIGNAL CIRCUIT
  • Turn the ignition switch to the LOCK 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 [KEYLESS ENTRY SYSTEM].)

No

Go to the next step.

9

    INSPECT COMMUNICATION CIRCUIT (OUTPUT) FOR CONTINUITY
  • Turn the ignition switch to the LOCK position.

  • Disconnect the instrument cluster connector.

  • Is there continuity between coil antenna terminal A and instrument cluster terminal 2Q?

Yes

Repair the wiring harness.

No

Go to the next step.

10

    INSPECT COIL ANTENNA OUTPUT SIGNAL CIRCUIT
  • Measure the resistance between instrument cluster terminal 2Q 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.




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