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2008 - MX-5 - Body and Accessories

SECURITY LIGHT 13, DTC -/B2431/P1260 [IMMOBILIZER SYSTEM (ADVANCED KEYLESS SYSTEM)]



DTC

Security light flashing pattern

13

ID number signal is not received

M-MDS display

Keyless control module

-

Instrument cluster

B2431

PCM

P1260

POSSIBLE CAUSE

  • The procedure fails to program the transponder into PCM

  • Any of the following items are touching or near the key head.

    • Spare keys

    • Keys for other vehicles equipped with an immobilizer system

    • Any metallic object

    • Any electronic device, or any credit or other cards with magnetic strips


Diagnostic procedure

STEP

INSPECTION

ACTION

1

VERIFY DTC USING M-MDS
  • Does M-MDS indicate DTC B2431?

Yes

Go to Step 3.

No

Go to next step.

2

VERIFY DTC USING M-MDS
  • Does M-MDS indicate DTC B1600?

Yes

Go to SECURITY LIGHT 13, DTC -/B1600/P1260.

(See SECURITY LIGHT 13, DTC -/B1600/P1260 [IMMOBILIZER SYSTEM (ADVANCED KEYLESS SYSTEM)].)

No

Go to next step.

3

INSPECT KEYLESS CONTROL MODULE

Yes

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

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

No

DTC troubleshooting completed.

4

INSPECT INSTRUMENT CLUSTER
  • Using registered key, turn ignition switch to ON position.

  • Does M-MDS indicate DTC -/B2431/P1260 again?

Yes

Replace instrument cluster and reprogram immobilizer system.

No

DTC troubleshooting completed.




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