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2008 - MX-5 - Body and Accessories

NO.1 DOOR CANNOT BE LOCKED/UNLOCKED BY TRANSMITTER (CARD KEY) [ADVANCED KEYLESS SYSTEM]



1

Door cannot be locked/unlocked by transmitter (card key)

POSSIBLE CAUSE

  • Malfunction in transmitter (card key) battery or transmitter (card key)

  • Malfunction in keyless control module

  • Malfunction in keyless receiver

  • Wrong usage

  • The after-market electrical parts are interfering with the keyless entry system


Diagnostic procedure

STEP

INSPECTION

ACTION

1

  • Attempt to lock/unlock the door with the transmitter (card key).

  • Does the operation indicator light (LED) illuminate?

Yes

Go to the next step.

No

Go to step 7.

2

  • Did the customer activate the transmitter (card key) within operative area (Within 2.5 m {8.2 ft} from area around vehicle)?

Yes

Go to the next step.

No

The system is normal.

Explain to the customer that the system does not work without the system operative area.

3

  • Did the customer use the keyless entry system in particular area, such as being near TV towers, power plants, power lines, or factories?

Yes

The system is normal.

Area of operation is subject.

Explain effect of outside interference on the transmitter (card key) to the customer.

No

Go to the next step.

4

  • Did the customer activate the keyless entry system with all following conditions satisfied?

    • All doors closed

    • Mechanical key is not in steering lock unit.

    • Start knob is at LOCK position.

    • Start knob is not pressed.

Yes

Go to the next step.

No

The system is normal.

Explain to the customer that the system does not work without these conditions satisfied.

5

  • Are any of the following after-market electrical parts on the vehicle?

    • Cellular phone

    • Radio-wave equipment

    • Remote engine starter

    • TV

    • Other

Yes

Go to the next step.

No

Go to step 7.

6

  • Disconnect the after-market electrical parts connectors and attempt to lock/unlock the doors with the transmitter (card key).

  • Does the keyless entry system work?

Yes

The system is normal. The after-market electrical parts are interfering with the keyless entry system.

No

Go to the next step.

7

  • Is there repair record of the customer's keyless entry system?

Yes

Go to the next step.

No

Go to Step 10.

8

  • Does the malfunction occur after the repair?

Yes

Go to the next step.

No

Go to Step 10.

9

Yes

System is normal. (Explain to the customer that the malfunction occurred because all the transmitter (card key) ID numbers were not updated even though the body control module or a transmitter (card key) was replaced in the previous servicing.)

No

Go to the next step.

10

  • Visually inspect the transmitter (card key) battery for the following:

    (See CARD KEY BATTERY REPLACEMENT [ADVANCED KEYLESS SYSTEM].)

    • Battery insertion direction (correct polarity)

    • Battery type (CR2025)

    • Corrosion, soiling, deformation of battery terminals (plus/minus terminals)

    • Contact malfunction between the battery terminal and battery when battery is inserted

  • Is there any malfunction?

Yes

    Battery insertion direction, battery type problem:
  • Properly install the battery or replace the battery with a specified one (CR2025), then go to the next step.

    Malfunction with the battery terminals:
  • Clean corrosion and soiling or repair the terminal, then go to the next step.

No

Go to the next step.

11

NOTE:

  • Use a new monitor battery (normal battery) or one from another vehicle which operates normally.

  • Replace the battery in all the transmitters (card key) with a monitor-use battery (normal battery).

    (See CARD KEY BATTERY REPLACEMENT [ADVANCED KEYLESS SYSTEM].)

  • For each transmitter (card key), verify that the transmitter operation indicator light (LED) illuminates when a button is operated.

  • Does operation indicator light (LED) for each transmitter (card key) operate?

Yes

Go to the next step.

No

If the operation indicator light (LED) does not illuminate, replace the transmitter, then go to the Step 24.

12

NOTE:

  • Inspect for all transmitters (card key).

  • Inspect while the batteries for all of the transmitters (card key) are replaced with monitor-use batteries (normal battery).

  • Verify the operation of keyless entry system using all of the transmitters (card key).

  • Does the keyless entry system operate properly?

Yes

Replace the transmitter (card key) battery, and then go to Step 24.

(See CARD KEY BATTERY REPLACEMENT [ADVANCED KEYLESS SYSTEM].)

No

Go to the next step.

13

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

  • Does the keyless entry system operate properly?

Yes

Replace the transmitter (card key) battery, and then go to step 24.

No

Replace the transmitter (card key), and then go to Step 24.

14

  • Inspect for the keyless receiver installation.

  • Is the bracket securely installed on the keyless receiver?

Yes

Go to the next step.

No

Install the bracket securely, and then go to the next step.

15

  • Turn the ignition switch to the LOCK position.

  • Measure the voltage at keyless receiver terminal A?

  • Is the voltage B+?

Yes

Go to the next step.

No

  • Inspect ROOM 15 A fuse.

  • Inspect and repair the wiring harness between the fuse block and the keyless receiver as necessary.

16

  • Measure the voltage at keyless receiver terminal E?

  • Is the voltage 0 V?

Yes

Go to the next step.

No

  • Inspect and repair the wiring harness between the ground wire and the keyless receiver as necessary.

  • Re-tighten the ground wire as necessary.

17

  • Disconnect the keyless receiver connector (6-pin) and keyless control module connector (75-pin).

  • Is there continuity between the following terminals?

    • Keyless receiver connector terminal A—keyless control module connector terminal 3S

    • Keyless receiver connector terminal C—keyless control module connector terminal 3U

Yes

Go to the next step.

No

  • Inspect and repair the wiring harness between the keyless control module and the keyless receiver, then go to the next step.

18

  • Remove the key from steering lock.

  • 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

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

19

  • Measure the signal wave pattern of keyless control module terminal 3U using an oscilloscope while the transmitter (card key) is operated with the auxiliary key removed from the ignition key cylinder.

  • Does the wave pattern change when the transmitter (card key) is operated?

NOTE:

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

Yes

Go to the next step.

No

Replace the keyless receiver, and then go to Step 24.

20

  • Measure the voltage at the keyless contorl module terminals 3B, 3I, 1E and 1F.

    • Terminal 3B: IG1 voltage

    • Terminal 1E, 1F: B+

    • Terminal 3I: ACC voltage

  • Is the voltage as above?

Yes

Go to the next step.

No

  • Inspect for fuse.

  • Inspect and repair the wiring harness between the keyless control module and the fuse block as necessary.

  • Then go to the next step.

21

  • Measure the voltage at keyless control module terminal 3C?

  • Is the voltage 0 V?

Yes

Go to the next step.

No

  • Inspect and repair the wiring harness between the ground wire and the keyless control module as necessary.

  • Re-tighten the ground wire as necessary.

  • Then go to the next step.

22

  • 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 for key reminder switch.

  • Inspect and repair the wiring harness between the steering lock unit (key reminder switch) and the keyless control module.

  • Then go to the next step.

23

  • Measure voltage at the keyless control module terminal 4Q.

    • All doors closed: B+

    • Any door opened: below 1.0 V

  • Is the voltage normal?

Yes

Go to the next step.

No

Inspect the door switch.

If normal, inspect for open or short at the door switch related harness.

24

  • Measure the voltage at the keyless contorl module terminals 1C and 1A while operating the transmitter.

    • All doors locked: 1.0 V or less→B+1.0 V or less (terminal 1C)

    • Any door unlocked: 1.0 V or lessB+1.0 V or less (terminal 1A)

  • Is the voltage as above?

Yes

Replace the keyless control module.

No

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

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

25

  • 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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