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VW Polo 9N 2002 - the central locking controller does not turn off the light

alarec 16839 13
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  • #1 16836676
    alarec
    Level 11  
    Posts: 60
    Rate: 6
    Hello,

    I recently installed a Carprotect BX70s Polo Polo IV (9N) from 2002. The central lock was equipped with the car, but there was no remote control to open, so I bought myself such a miracle. Opening / closing works, directions work.

    Problem:
    After closing from the remote control, the controller does not turn off the headliner light (opening does not light).
    after closing / opening from the door / key, the lamp in the headlining automatically turns on or off. Opening / closing with the remote control does not do this.

    I connected it according to the diagram (below) to the driver's door harness.
    1) white with pink through a 770 Ohm resistor, to brown-green with door bundles
    2) black and white through a 180 Ohm resistor to blue and white with a door bundle
    3) red +12 to red-yellow with door bundles
    3) yellow, yellow-black, black to mass, to brown in the bundle in the lower left threshold (it was more convenient)
    4) directions to green-gray and green-black (if I remember correctly) from the beam in the lower left threshold

    VW Polo 9N 2002 - the central locking controller does not turn off the light

    Is any of you aware of the problem, and is it even possible?
    Currently, the lamp must be off all the time, because it also lights up when the key is removed.
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  • #2 16838706
    CameR

    Moderator of Vehicle Security
    Posts: 7680
    Help: 1131
    Rate: 3252
    ... my way you have connected the lock control differently than all the instructions suggest.
    In this Polo you control on one white / blue wire:
    Closing - mass
    opening - mass through 180 Ohm resistor
    Company Account:
    ABC KOM
    Barcelońska 77, Katowice, 40-683 | Tel.: 601XXXXXX (Show) | Company Website: https://www.auto-alarm.com.pl
    Helpful post? Buy me a coffee.
  • #3 16838810
    alarec
    Level 11  
    Posts: 60
    Rate: 6
    Unfortunately, this did not work. I tried before installing the driver.
    Opening did work, but closing at all.
    Then I found a description that in polo 9N1 for closing is brown-green - and it was a shot at 10 - because it was closing.
    Then I installed the controller.
    It is a polo with comfort module, 5D, I think it makes a difference.

    PS.
    I did not have 180 and 770 resistors upstream, so I connected several resistors in series, came out 183 Ohm and 768 Ohm -> but this should not affect?
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  • #4 16838942
    CameR

    Moderator of Vehicle Security
    Posts: 7680
    Help: 1131
    Rate: 3252
    I would connect the control inside the door - directly to the wires coming out of the lock.
    I would check if the interior lamp works with such control.
    Company Account:
    ABC KOM
    Barcelońska 77, Katowice, 40-683 | Tel.: 601XXXXXX (Show) | Company Website: https://www.auto-alarm.com.pl
    Helpful post? Buy me a coffee.
  • #5 16838958
    alarec
    Level 11  
    Posts: 60
    Rate: 6
    Almost everything is taken from the door. Only mass and directions taken from another bundle (directions are not in the door)
  • #6 16839389
    CameR

    Moderator of Vehicle Security
    Posts: 7680
    Help: 1131
    Rate: 3252
    alarec wrote:
    after closing / opening from the door / key, the lamp in the headlining automatically turns on or off. Opening / closing with the remote control does not do this.

    If you connect to the lock harness, it MUST work.
    Company Account:
    ABC KOM
    Barcelońska 77, Katowice, 40-683 | Tel.: 601XXXXXX (Show) | Company Website: https://www.auto-alarm.com.pl
    Helpful post? Buy me a coffee.
  • #7 16851880
    alarec
    Level 11  
    Posts: 60
    Rate: 6
    I noticed by chance that after closing the remote control, the light goes out, but it takes about 5 minutes.
    By closing the central lock with a button on the door, the same happens from the inside.

    But surprisingly, closing the key from the door from the outside, the lamp is extinguished immediately.

    I am to worry that it will significantly burden me with the battery, does it make much difference?
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  • #8 16851929
    Raywood
    Level 12  
    Posts: 29
    Help: 5
    Rate: 16
    Get into the car, lock the car with the remote control and check if you open the door by pulling the internal handle 2x. (the first one will unlock the lock and the second one you will open). If this happens then you are connected to this button on the door.
    By locking the car with the key, you will not be able to open the door from the inside.
  • #9 16859965
    kozik20l
    Level 14  
    Posts: 89
    Help: 9
    Rate: 16
    At 99% like a colleague I write blue and white wire coming directly from the lock closing opening for 180ohm as it holds should also close the glass as it has a function. I propose to do this blue and white not through the control because it can go crazy castle
  • #10 16859980
    Pawel wawa
    VIP Meritorious for electroda.pl
    Posts: 16093
    Help: 1262
    Rate: 4416
    alarec wrote:
    770 resistors
    What did you come up with here? You close with a "clean mass" without resistors! You open the mass through a 180? resistor connected of course in series to ground. You connect according to scheme f2 only the opening signal you give through the resistor. or according to the F4 scheme only instead of to a plus, you connect to ground via a resistor.
  • #11 16860022
    PREDAT
    Level 24  
    Posts: 525
    Help: 76
    Rate: 140
    It comes out. that the car driver sees the door open all the time.
    When the ignition is on, does the lamp light up and go out when opening and closing each door?
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  • #12 16860091
    Pawel wawa
    VIP Meritorious for electroda.pl
    Posts: 16093
    Help: 1262
    Rate: 4416
    PREDAT wrote:
    It comes out. that the car driver sees the door open all the time.
    Sure, since he connected so ;)
  • #13 16860126
    PREDAT
    Level 24  
    Posts: 525
    Help: 76
    Rate: 140
    Well, but if you close your remote control with it, then the control panel in such a system
    does not affect the rest of the signal cables. White and black and white "hang in the air"
    but the light does not go out. I smell here some malfunctions of the door opening sensor.
    Well, unless the author sour something he did not write about :D
  • #14 17093938
    siwyBB
    Level 12  
    Posts: 12
    Help: 2
    Rate: 13
    Hello.I connected today like this:
    - closing mass from closing windows through a blue and white diode,
    -opening the mass through a 150 ohm resistor to the same blue-white.
    Everything works, i.e. after closing, the red LED next to the dust on the door blinks and the lamp goes out, and when it opens, the lamp lights up. Regards.
    PS
    After closing, it additionally closes the open windows.
    Attachments:
    • VID_20180310_125343.mp4 (29.03 MB) You must be logged in to download this attachment.

Topic summary

✨ The discussion revolves around a user who installed a Carprotect BX70s central locking controller in a 2002 VW Polo 9N. The user reports that while the remote control successfully opens and closes the locks, it fails to turn off the headliner light after closing. Various responses suggest checking the wiring connections, specifically the use of resistors and the correct wires for locking and unlocking. Some users recommend connecting directly to the lock harness for proper functionality. The issue of the interior light delay after remote locking is also raised, with concerns about battery drain. A successful connection method is later shared, which resolves the light issue and allows for window closure upon locking.
Generated by the language model.

FAQ

TL;DR: On Polo 9N (2002), use the blue/white lock wire: close by ground, open by ground through a 180 Ω resistor; “close with a clean ground.” [Elektroda, Pawel wawa, post #16859980]

Why it matters: This fixes “remote closes but dome light stays on” issues without stressing the comfort module, ideal for DIY “how do I fix my central locking light?” users.

Quick Facts

Why does my Polo 9N lock by remote but the dome light stays on?

You likely connected to the door button/switch circuit, not the lock harness. That circuit keeps the “door open” logic alive, so the lamp times out instead of shutting off immediately. Wire the remote to the lock’s blue/white line: close = ground, open = ground through a resistor. “If you connect to the lock harness, it MUST work.” [Elektroda, CameR, post #16839389]

Which wire controls lock/unlock on Polo 9N (2002)?

Use the blue/white wire exiting the door lock. Send a direct ground to close. Send a ground through a resistor to open. This matches the car’s comfort module logic and avoids the dome light delay. [Elektroda, CameR, post #16838706]

What resistor value should I use for the ‘open’ signal?

Use about 180 Ω in series to ground for the open command. The close command is a clean ground with no resistor. This setup mimics the OEM pulse levels and prevents false states on the comfort module. [Elektroda, Pawel wawa, post #16859980]

Can 150 Ω work instead of 180 Ω for opening?

Yes. One installer reported success with 150 Ω for opening on the same blue/white wire, plus a diode to the window-closure line. The system armed, the LED blinked, the lamp turned off on close, and windows closed. [Elektroda, siwyBB, post #17093938]

I used brown‑green for closing and it works—am I wrong?

Some early 9N1 setups closed on brown‑green. However, for synchronized dome light behavior, connect at the lock harness blue/white line and follow the ground/ground‑through‑resistor scheme. This avoids unintended delays. [Elektroda, alarec, post #16838810]

Is a 5‑minute dome light delay normal after remote lock?

It happens when the controller is tied to the door button circuit. The light then turns off after about five minutes. Rewiring to the lock harness removes the delay and shuts the light off immediately on lock. [Elektroda, alarec, post #16851880]

How do I wire a CarProtect BX70s so the light behaves correctly?

  1. Tap the blue/white wire at the door lock harness.
  2. Wire ‘close’ output to clean ground; wire ‘open’ output to ground through ~150–180 Ω.
  3. Optionally add a diode as shown by installers; test lock, unlock, and lamp timing. “Works: LED blinks, lamp off on close.” [Elektroda, siwyBB, post #17093938]

Do series‑combined resistors (e.g., 183 Ω) cause problems?

Using series resistors to approximate 180 Ω generally works. Issues arise when you place a resistor on the close line or connect to the wrong circuit. Keep ‘close’ as clean ground and ‘open’ through the resistor only. [Elektroda, alarec, post #16838810]

Why does locking with the key turn the lamp off immediately, but the remote doesn’t?

The key actuates the lock directly, so the comfort module recognizes a proper secure state and turns the lamp off immediately. Remote controllers wired to the door button circuit leave the module waiting, causing the delay. [Elektroda, alarec, post #16851880]

How can I verify I’m tied to the door button circuit by mistake?

Sit inside, lock with the remote, and pull the inner handle twice. If the first pull unlocks and the second opens, you’re on the button circuit, not the lock line. Rewire to the lock harness. [Elektroda, Raywood, post #16851929]

Edge case: could a faulty door‑open sensor keep the light on?

Yes. If the controller “sees” a door as open, the lamp may not extinguish on time. Check the door‑open sensor and wiring if correct harness wiring still leaves the lamp on. [Elektroda, PREDAT, post #16860022]

Will connecting directly at the lock harness sync the lamp every time?

Yes. Experts advise connecting inside the door at the wires exiting the lock. This ensures the comfort module sees authentic lock/unlock and updates the interior light correspondingly. [Elektroda, CameR, post #16838942]

What is CAN bus, and does this mod require coding?

CAN bus is the car’s controller network. For this retrofit, you don’t code the CAN bus. You emulate the lock’s expected ground signals at the blue/white line, which the comfort module already understands. [Elektroda, CameR, post #16838706]

Can this setup also close the windows when locking?

Yes. When using the blue/white line correctly, users reported comfort closing of open windows on lock, along with proper alarm LED and dome light behavior. [Elektroda, siwyBB, post #17093938]

Quote check: is connecting at the lock harness really mandatory?

As one expert put it, “If you connect to the lock harness, it MUST work.” Use that point to diagnose wiring errors before suspecting module faults. [Elektroda, CameR, post #16839389]

Why shouldn’t I put a resistor on the ‘close’ line?

Closing expects a solid ground. Adding resistance can prevent the comfort module from registering a firm close, causing misbehavior like lingering lights. Keep only the opening path resistive. [Elektroda, Pawel wawa, post #16859980]
Generated by the language model.
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