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2008 - MX-5 - Body and Accessories

NO.3 TRANSMITTER ID CODE CANNOT BE REPROGRAMMED [KEYLESS ENTRY SYSTEM]



3

Transmitter ID code cannot be reprogrammed

DESCRIPTION

  • Malfunction in keyless receiver or keyless control module circuit.

POSSIBLE CAUSE

  • Malfunction in keyless receiver related part

    • Keyless receiver malfunction

    • Keyless receiver power supply fuse malfunction

    • Malfunction in wiring harness between keyless receiver and ground

    • Malfunction in wiring harness between keyless receiver power supply fuses and keyless receiver

    • Malfunction in wiring harness between keyless receiver and keyless control module

  • Malfunction in keyless control module

    • Malfunction in wiring harness between keyless receiver and keyless control module

    • Keyless control module malfunction


Diagnostic procedure

STEP

INSPECTION

ACTION

1

INSPECT POWER SUPPLY FUSE

  • Is the keyless receiver power supply fuse normal?

Yes

Go to the next step.

No

Install an appropriate amperage fuse, then go to Step 6.

2

INSPECT IF MALFUNCTION IS IN WIRING HARNESS (NO CONTINUITY BETWEEN FUSE BLOCK AND KEYLESS RECEIVER) OR ELSEWHERE

  • Measure the voltage at the following keyless receiver terminal:

    • Power supply signal (terminal 1A)

  • Is the voltage B+?

Yes

Go to the next step.

No

Repair the wiring harness between the fuse block and keyless receiver, then go to step 6.

3

INSPECT IF MALFUNCTION IS IN WIRING HARNESS (NO CONTINUITY BETWEEN KEYLESS RECEIVER AND GROUND) OR ELSEWHERE

  • Is there continuity between keyless receiver connector terminal 1E and ground?

Yes

Go to the next step.

No

Repair the wiring harness between the keyless receiver and ground, then go to step 6.

4

INSPECT IF MALFUNCTION IS IN WIRING HARNESS (NO CONTINUITY BETWEEN KEYLESS RECEIVER AND KEYLESS CONTROL MODULE) OR ELSEWHERE

  • Disconnect the keyless receiver connector and keyless control module.

  • Is there continuity between the following terminals?

    • Terminal 1A—terminal 3S

    • Terminal 1C—terminal 3U

Yes

Go to the next step.

No

Repair the wiring harness between the keyless receiver and keyless control module, then go to step 6.

5

INSPECT IF MALFUNCTION IS IN WIRING HARNESS (NO CONTINUITY BETWEEN KEYLESS RECEIVER AND KEYLESS CONTROL MODULE) OR KEYLESS CONTROL MODULE

  • Measure the signal wave pattern for keyless receiver terminal 1C using an oscilloscope when the transmitter is operated with the key not inserted into the ignition key cylinder.

  • Does the wave pattern change when the transmitter is operated?

NOTE:

  • Perform the oscilloscope setting using 0.5V/DIV (Y), 100ms/DIV (X), DC range.

Yes

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

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

No

Replace the keyless receiver, then go to the next step.

(See KEYLESS RECEIVER REMOVAL/INSTALLATION [ADVANCED KEYLESS SYSTEM].)

6

REINSPECT MALFUNCTION SYMPTOM AFTER REPAIR

  • Does the keyless entry system operate properly?

Yes

Troubleshooting completed.

Explain repairs to the customer.

No

Reinspect the malfunction symptoms, then repeat from step 1 if the malfunction recurs.




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