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2008 - MX-5 - Body and Accessories

SECURITY LIGHT 22, DTC -/B2141/P1260 [IMMOBILIZER SYSTEM (ADVANCED KEYLESS SYSTEM)]



DTC

Security light flashing pattern

22

Communication error between the instrument cluster and the PCM (data transfer error)

M-MDS display

Keyless control module

-

Instrument cluster

B2141

PCM

P1260

POSSIBLE CAUSE

  • Malfunction in the wiring harness (CAN line) between the instrument cluster and the PCM

  • Instrument cluster malfunction

  • PCM malfunction


Diagnostic Procedure



STEP

INSPECTION

ACTION

1

    VERIFY DTC
  • Are either U1900 or U0073, or both displayed, by either the instrument cluster or the PCM, or both?

Yes

Perform troubleshooting according to the corresponding DTC inspection.

(See DTC U0073, U2516 [MULTIPLEX COMMUNICATION SYSTEM].)

No

Go to the next step.

2

    VERIFY DTC
  • Using the registered key, turn the ignition switch to the ON position.

  • Is the DTC displayed?

    • Security light: 22

    • M-MDS: -/B2141/P1260

Yes

No

DTC troubleshooting completed.

3

    EXAMINE INSTRUMENT CLUSTER AND PCM
  • Is the DTC displayed again?

    • Security light: 22

    • M-MDS: -/B2141/P1260

Yes

No

DTC troubleshooting completed.

4

    EXAMINE PCM
  • Is the DTC displayed again?

    • Security light: 22

    • M-MDS: -/B2141/P1260

Yes

No

DTC troubleshooting completed.




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