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Seat Leon I Central Lock Remote Control: No Diode Response After Battery Replacement

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  • #1 16279092
    opsops
    Level 9  
    Posts: 25
    Rate: 8
    Board Language: polish
    Hello, I bought a car with a remote control of the central lock in the Seat Leon I. Initially I thought that the battery had died but after replacing the battery still does not work, no response of the diode on the remote. I checked February on PCBs and they look ok, micro contacts also ok.Ktoś maybe had a similar problem?
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  • #2 16279112
    daro31ie
    Automation specialist  
    Posts: 2425
    Help: 366
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    Board Language: polish
    Is there a diode in this remote?
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  • #3 16279169
    opsops
    Level 9  
    Posts: 25
    Rate: 8
    Board Language: polish
    Led indicates the pressure of the button. Tear type wrench.
    Attachments:
    • Seat Leon I Central Lock Remote Control: No Diode Response After Battery Replacement kluczyk toledo2.jpg (44.8 KB) You must be logged in to download this attachment.
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  • #4 16279339
    Ireneo
    Level 42  
    Posts: 7818
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    Board Language: polish
    We have to guess that after reading the net you discovered the phrase "the pilot gives"?
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  • #5 16279502
    opsops
    Level 9  
    Posts: 25
    Rate: 8
    Board Language: polish
    The pilot does not work at all, but the car starts off.
  • #6 16279646
    grala1
    VAG group specialist  
    Posts: 9812
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    Board Language: polish
    What is the frequency of the pilot?
    It is given on the housing.
    What battery is inside?
    One or two batteries?
    Vintage car?
  • #7 16279950
    CameR

    Moderator of Vehicle Security  
    Posts: 7673
    Help: 1131
    Rate: 3249
    Board Language: polish
    opsops wrote:
    The pilot does not work at all, but the car starts off.

    Disassemble the housing,
    make good quality photos of both sides of the tile,
    clean with a brush,
    replace the battery,
    check if it works.

    You will not do more without appropriate tools, testers and measuring instruments.
    Company Account:
    ABC KOM
    Barcelońska 77, Katowice, 40-683 | Tel.: 601XXXXXX (Show) | Company Website: https://www.auto-alarm.com.pl
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  • #8 16280087
    opsops
    Level 9  
    Posts: 25
    Rate: 8
    Board Language: polish
    Pilot Hella 433Mhz 5fa 007 680
    One Varta CR2032 3V battery (correctly installed)
    Seat Leon 1.8 125 KM 2000
    I will add photos later.

    Added after 29 [minutes]:

    Photos of the key inside.
    Attachments:
    • Seat Leon I Central Lock Remote Control: No Diode Response After Battery Replacement 5.jpg (220.31 KB) You must be logged in to download this attachment.
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    • Seat Leon I Central Lock Remote Control: No Diode Response After Battery Replacement 3.jpg (152.73 KB) You must be logged in to download this attachment.
    • Seat Leon I Central Lock Remote Control: No Diode Response After Battery Replacement 2.jpg (206 KB) You must be logged in to download this attachment.
    • Seat Leon I Central Lock Remote Control: No Diode Response After Battery Replacement 1.jpg (150.34 KB) You must be logged in to download this attachment.
  • #9 16280280
    CameR

    Moderator of Vehicle Security  
    Posts: 7673
    Help: 1131
    Rate: 3249
    Board Language: polish
    Watch the remote control under the microscope or magnifying glass.
    Look for cold solders, cracked paths, etc ...

    Connect the pilot board's power supply to an external 6V stabilized power supply,
    measure the current consumption by the "plate" from the power source.
    Check three times - where to connect [+] where [-] power!
    Check whether the current consumption from the power supply changes when you press the switch on the "PCB".

    You must start the pilot diagnostics from these measurements.
    Company Account:
    ABC KOM
    Barcelońska 77, Katowice, 40-683 | Tel.: 601XXXXXX (Show) | Company Website: https://www.auto-alarm.com.pl
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  • #10 16280885
    opsops
    Level 9  
    Posts: 25
    Rate: 8
    Board Language: polish
    Due to the lack of appropriate tools, I entrust the repair to a specialist, if it is possible to repair the e-mail which was damaged.
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    #11 16281253
    grala1
    VAG group specialist  
    Posts: 9812
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    Board Language: polish
    In my opinion, this remote control should have 2 CR2016 batteries, so 6V and not 3V, and here is the problem.
    Newer remote controls are on one CR2032
  • #12 16282645
    opsops
    Level 9  
    Posts: 25
    Rate: 8
    Board Language: polish
    Buddy actually works on 6V. I connected 2 CR2032 batteries for a short time each and the key came to life. Only 2 such batteries will not enter there because they are too thick.
  • #13 16282653
    CameR

    Moderator of Vehicle Security  
    Posts: 7673
    Help: 1131
    Rate: 3249
    Board Language: polish
    grala1 wrote:
    this remote control should have 2 CR2016 batteries

    opsops wrote:
    2 CR2032 batteries (...) there they will not enter because they are too thick

    I close the topic
    Company Account:
    ABC KOM
    Barcelońska 77, Katowice, 40-683 | Tel.: 601XXXXXX (Show) | Company Website: https://www.auto-alarm.com.pl
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Topic summary

✨ The discussion revolves around a malfunctioning remote control for the central locking system of a Seat Leon I, where the user replaced the battery but the remote still does not respond. Various suggestions were made, including checking for a diode in the remote, verifying the battery type and configuration, and inspecting the PCB for cold solder joints or cracked paths. It was noted that the remote may require two CR2016 batteries for proper operation instead of one CR2032. The user confirmed that connecting two CR2032 batteries temporarily revived the remote, although they could not fit due to size constraints. The user decided to seek professional repair due to a lack of appropriate tools for further diagnostics.
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