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Ford Focus MK1 2002 - Central locking control unit does not lock

trajmund 5505 13
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  • #1 17077722
    trajmund
    Level 10  
    Hello everyone. I will stick to the topic if I can. I know that many posts have already been on the forum, but I have to write a new one because the problem is a bit different. Focus 2000 year. Opening and closing the central by turning the key in the driver's door lock works fine, but the problem is The following. Applying ground to the black and green wire at the driver's door opens all the doors, while giving ground to any other wires in this bundle does not close the central lock, so here the matter is by no means strange. Everything is ok when you try to locate the wire in the bundle responsible for closing the door has no effect. Could the comfort module be, so to speak, "released"?

    Moderated By CameR:

    Separated from: https://www.elektroda.pl/rtvforum/topic2785035.html
    Reg. 3.1.19. Do not send messages on archival topics if this is another question, especially other than the questioning person. Out of respect for the questioner, create your own topic. You can only add a solution to the problem.

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  • #3 17077928
    trajmund
    Level 10  
    I wrote that the opening in the driver's door works.
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  • #5 17078086
    autoas
    Level 42  
    trajmund wrote:
    while applying ground to any other wires in this bundle does not close the central lock

    Remember that you must do these attempts on all closed doors so that all the switches "see" the closed door ....
  • #6 17078099
    trajmund
    Level 10  
    I plugged in the appropriate cables. I even dismantled the "side" of the door and tried it directly at the driver's door lock and the effect is the same. Black and green opens the locked door, but connecting with mass to any of the wires does not close the central lock. Like clipping into the wires at the driver's side pillar, unfortunately, a strange thing.
  • #7 17078283
    abart64
    Level 33  
    I think the mass stays on one of the wires and giving the mass to the other does not work. You probably need to cut the wires and do relay switching. The second is, if I remember correctly, black and orange.
  • #9 17078456
    trajmund
    Level 10  
    abart64 wrote:
    I think the mass stays on one of the wires and giving the mass to the other does not work. You probably need to cut the wires and do relay switching. The second is, if I remember correctly, black and orange.

    It also seems to me that this is the only way to be done.

    Added after 1 [minutes]:

    CameR wrote:
    Lock control - in the harness to the driver's door:
    black and red, black and green (thin)
    downside control

    I tried in every way and nothing. Only the black and green cable opens. None of the others wants to close the lock.
  • #10 17078556
    Anonymous
    Anonymous  
  • #11 17078730
    trajmund
    Level 10  
    norbert.s. wrote:
    Defective control switch in the lock. Standard fault in Ford cars. If you cut the control wires in the side of the door and connect the control towards the car, it will work.

    The lock was replaced earlier. Unless the second one is damaged. When opening and closing the driver's door with the key, everything works normally (opens and closes).
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  • #12 17078732
    Anonymous
    Anonymous  
  • #13 17078745
    trajmund
    Level 10  
    norbert.s. wrote:
    There may be a second.

    So why is it going to be closed and opened centrally through the insert in the driver's door? If it goes to do it, it should open and close after applying the mass to the wires.
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Topic summary

✨ The discussion revolves around a central locking issue in a 2002 Ford Focus MK1, where the central locking control unit fails to lock the doors despite functioning correctly when using the key in the driver's door. The user reports that applying ground to the black and green wire opens all doors, but no other wires in the bundle successfully close the lock. Various responses suggest checking the wiring for the control from an additional controller, ensuring all doors are closed during testing, and the possibility of a defective control switch in the lock. The user has already replaced the lock but continues to experience issues, leading to speculation about potential wiring problems or the need for relay switching.
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FAQ

TL;DR: 2 trigger wires control Focus MK1 central locking; "Lock control ... black and red, black and green (thin)" and negative-trigger. Use the correct lock wire to close; black/green is unlock. [Elektroda, CameR, post #17078416]

Why it matters: This helps Ford Focus MK1 owners and installers fix central locking that opens but won’t lock via trigger inputs.

Quick Facts

Which wires close and open the central locking on a Focus MK1?

In the driver’s door harness, use two thin wires. Black/green is the unlock trigger. Black/red is the lock trigger. The system expects negative (ground) pulses. “Lock control … black and red, black and green (thin).” [Elektroda, CameR, post #17078416]

Why does grounding a wire open but not close the locks?

A failed driver’s lock control switch can leave the lock input stuck or ignored. That is a standard Ford fault. Cut the control wires in the door loom and command the car-side directly. “Defective control switch in the lock.” [Elektroda, Anonymous, post #17078556]

Do I need all doors closed when testing lock triggers?

Yes. The system must see all door-ajar switches closed. Otherwise it may ignore the close command. “Do these attempts on all closed doors.” Close every door, then pulse the chosen wire to test. [Elektroda, autoas, post #17078086]

How do I connect an aftermarket keyless or alarm to this Focus?

Tap the two thin trigger wires in the driver’s door harness. Send momentary ground pulses to command lock and unlock. Black/red closes. Black/green opens. Secure connections and avoid holding ground to prevent unintended cycling. [Elektroda, CameR, post #17078416]

How do I wire relays if one trigger line has constant ground?

Use two SPDT relays to isolate the vehicle from the faulty door-side. 1. Cut both trigger wires near the door. 2. Connect controller outputs to relay coils and contacts. 3. Feed momentary ground from relays to the car-side lock and unlock wires. This 2‑relay method prevents backfeeding. [Elektroda, abart64, post #17078283]

Could the comfort module be bad if lock won’t close via trigger?

It’s less likely if the car locks and unlocks with the key. That proves the module responds. The common failure is the driver’s lock switch. Bypass it by cutting door-side wires and driving the car-side. “Standard fault in Ford cars.” [Elektroda, Anonymous, post #17078556]

My loom doesn’t show black/red; any alternate lock color to check?

Some versions reportedly present black/orange as the lock signal. Verify with a test light before connecting. If colors vary, trace from the driver’s lock connector to the A‑pillar to confirm function. [Elektroda, abart64, post #17078283]

Is the Focus MK1 central locking negative or positive trigger?

It uses negative (ground) triggers for both lock and unlock. Apply a brief ground pulse to the respective wire. The original note states “downside control.” [Elektroda, CameR, post #17078416]

Grounding black/green unlocks, but nothing will lock—what next?

Close every door and retry. If lock still won’t respond, the driver’s lock switch is likely faulty. Cut the two control wires at the door and command the car-side directly from your controller or relays. [Elektroda, Anonymous, post #17078556]

Where exactly should I tap the wires—door or A‑pillar?

Tap in the harness to the driver’s door. Access is convenient at the A‑pillar boot or inside the door. Identify the thin black/red (lock) and black/green (unlock) before making connections. [Elektroda, CameR, post #17078416]

Why does the key still lock/unlock when trigger tests fail?

Users report the mechanical key still operates central locking even when manual grounding fails. That suggests the module and actuators work, and the issue lies in the door-side switching path. [Elektroda, trajmund, post #17078730]

I’ve tried many wires; could I be on the wrong cable?

Yes. Verify you are on the correct pair in the driver’s door harness. “You’re probably on the wrong cable.” Follow the thin black/green and black/red leads before committing connections. [Elektroda, CameR, post #17078072]
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