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2008 - MX-5 - Body and Accessories

NO.3 ADVANCED KEYLESS ENTRY FUNCTION INOPERATIVE [ADVANCED KEYLESS SYSTEM]



3

Advanced keyless entry function inoperative

POSSIBLE CAUSE

  • Malfunction in the transmitter (card key).

  • Malfunction in the keyless control module.

  • Malfunction in the keyless receiver.

  • Malfunction in the keyless antenna.

  • Wrong usage.


Diagnostic procedure

STEP

INSPECTION

ACTION

1

  • Retrieve the advanced keyless system DTC using the M-MDS.

  • Are there DTC displayed?

Yes

Perform the applicable DTC diagnostic procedures.

No

Go to the next step.

2

  • Did the customer attempt to operate each front doors and trunk rid using the request switch?

Yes

Go to the next step.

No

Inspect the advanced keyless system operations using the request switch. If the advanced keyless system is inoperative, then go to the next step.

3

  • Prepare the followings:

    • Make sure that there is no transmitter (card key) inside the passenger compartment.

    • Close all doors including trunk rid.

    • Remove the key from the steering lock.

    • Make sure that start knob is to the LOCK position. (Do not Press the knob)

    • Make sure that the transmitter (card key) is within the advanced keyless system operative area (within 80 cm {2.6 ft} from front door)

  • Does the advanced keyless system operate properly?

Yes

The system is normal. Explain the advanced keyless system operation.

No

Go to the next step.

4

  • Replace with a transmitter (card key) battery known to be good.

  • Operate the transmitter (card key).

  • Does the keyless entry system operate properly?

Yes

Replace the transmitter (card key). Then go to the next step.

No

Go to the next step.

5

  • Measure the voltage at the keyless control module terminals 4H, 4J and 4L while operating the request switch.

    • Operate driver’s side front door request switch (4J): 5.0 V→1.0 V or less

    • Operate passenger’s side front door request switch (4H): 5.0 V→1.0 V or less

    • Operate trunk lid request switch (4L): 5.0 V→1.0 V or less

  • Is the voltage as above?

Yes

Go to the next step.

No

Inspect and repair the applicable wiring harness as necessary, then go to the next step.

6

  • Turn the start knob to LOCK position with mechanical key is not in ignition switch, and the start knob is not pushed.

  • Measure the voltage following keyless control module connector.

    • Terminal 3O (keyless switch): below 1.0 V

    • Terminal 3N (start knob (push switch)): below 1.0 V

    • Terminal 3I (ACC voltage): below 1.0 V

    • Terminal 3B (IG1 voltage): below 1.0 V

  • Is the signal voltage normal?

Yes

Go to the next step.

No

Inspect and repair for open or short circuit in wiring between the suspect switch and keyless control module, then go to the next step.

7

  • Simulate the following keyless antenna using the M-MDS:.

    • ANT_RF# (exterior, RF keyless antenna: terminals 2A and 2B)

    • ANT_LF# (exterior, LF keyless antenna: terminals 2C and 2D)

    • ANT_BK# (exterior, rear keyless antenna: terminals 2E and 2F)

    • ANT_INN1# (interior, trunk keyless antenna: terminals 2G and 2H)

    • ANT_INN2# (interior, rear keyless antenna: terminals 2I and 2J)

    • ANT_INN3# (interior, middle keyless antenna: terminals 2K and 2L)

    • ANT_INN4# (interior, front keyless antenna: terminals 3G and 3H)

  • Does each antenna operate properly (ON/OFF)?

Yes

Go to the next step.

No

  • Inspect for open or short circuit between suspect keyless antenna and keyless control module.

    • If the wiring harness normal, replace suspect keyless antenna, then go to the next step.

    • If the wiring harness is not normal, repair or replace for open or short circuit, then go to the next step.

8

  • Measure the pulse profile using an oscilloscope at the keyless control module terminal 3U while operating the transmitter (card key).

  • Is the pulse profile become long at moment of transmitter operation?

Yes

Go to the next step.

No

  • Inspect the wiring harness between the keyless receiver and the keyless control module.

    • If the harness is normal, replace the keyless receiver.

    • If the harness is malfunctioning, repair the wiring harness.

  • Go to the next step.

9

  • Measure the voltage at the keyless control module terminal 1A while operating the request switch.

    • Unlock: 1.0 V or less→B+1.0 V or less

  • Is the voltage as above?

Yes

Inspect the keyless control module and replace as necessary.

No

Inspect and repair the wiring harness between keyless control module and door lock actuator.

If the wiring harness is normal, inspect the door lock actuator.

10

  • Does the keyless entry system operate properly?

Yes

Troubleshooting completed. Explain repairs to the customers

No

Re-inspect the malfunction symptoms, then repeat form Step 1 if malfunction recurs.




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