How to Program Mazda3 Alexa 2017 All Keys Lost with Lonsdor K518

Guide to add smart key and program all keys lost on a Mazda3 Alexa 2017 by Lonsdor K518 key programmer via OBD.

Key information:

Chip type: special smart card

Frequency: 433MHz

Pin code: No

Remote generation: smart key programming completed will generate remote automatically

Device to program: Lonsdor K518ISE (English version of K518)

OBD location: Under the steering wheel

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 1: Add smart key


Connect K518 host with vehicle via diagnostic socket

Select Immobilizer->Mazda->Alexa

Communicating…

K518 read part number

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Turn ignition switch to ON position

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K518 identified key programmed: 2

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Communicating…

Stick the non-registered smart key on the Start button

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Programming…

Automatic model please step on the pedal brake

Manual model please step on the clutch

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Programming…

Identify key programmed: 3

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Turn ignition OFF

All programmed key must perform following operations:

Step on pedal brake, press on Start button with remote key with car logo mark and start turn IGN ON

Turn IGN OFF after 3s

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Program success

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1: All keys lost


Connect K518 host with vehicle via diagnostic socket

Select Immobilizer->Mazda->Alexa

Communicating…

K518 read part number

Require at least 2 keys

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 Turn ignition ON. If cannot switch ignition on, please press on Cancel button

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 Communicating…

Key programmed:3

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 Communicating…

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 Lonsdor K518ISE identified key programmed: 0

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 Turn ignition OFF

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 Hold non-registered smart key in hand

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 Turn ignition ON

Stick 1st smart key with logo on the Start button

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 Programming…

Key programmed:1

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Turn ignition off

 Hold non-registered smart key in hand

Turn ignition ON

Stick 2nd smart key with logo on the Start button

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 Programming…

Key programmed: 2

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 Turn ignition OFF

All programmed key must perform following operations:

Step on pedal brake, press on Start button with remote key with car logo mark and start turn IGN ON

Turn IGN OFF after 3s

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 Program success.

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