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2004 Nissan Micra K12: Unprompted Activation of Front Wipers After Rainfall or Car Wash

Rogas28 13911 11
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  • #1 16968343
    Rogas28
    Level 2  
    Posts: 3
    Rate: 1
    Good morning everyone,

    I have a 2004 Micre K12. A month ago I had the following problem. After the engine is turned on, the front wipers start to wiggle automatically. Sometimes they walk a few times and stop, sometimes they walk for a few or even several minutes. The problem first appeared after a car was washed in a hand wash, and now it recurs after rainfall. I took out the fuse from the washer pump, but nothing helps (the same applies to the wipers). An interesting fact is that the wipers do not turn on after starting the ignition switch (aculumator), but only after starting the engine. Does anyone have any idea for self-repair, or is I waiting for a visit to a mechanic / electrician?
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  • #2 16969088
    piotrekwoj1
    Level 43  
    Posts: 10340
    Help: 930
    Rate: 3365
    I think it is impossible without diagnostics. I don't think the switch will flood with water, maybe the BCM is defective.
  • #3 16969184
    Rogas28
    Level 2  
    Posts: 3
    Rate: 1
    My guess is that the BCM module is responsible for more than just working wipers, and nothing else is happening to the car.
    I just noticed the front wipers stop moving a moment after the rear window washer is turned on. Of course, when I stop using it, they turn on immediately.
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  • #5 17080515
    diakov
    Level 2  
    Posts: 2
    Rate: 2
    The problem can be solved in a simple way by soldering the taj resistor as in the post https://www.elektroda.pl/rtvforum/topic1584294.html it was written by a colleague diodakus.
    I had exactly the same problem. The windshield wipers turned on automatically after the washer motor shorted against moisture. I soldered a 3k? resistor directly on the wiper switch board between the red and black cable, because I did not want to cut the insulation from the cables. These cables are the mass of the washers and + 12V. There is a lot of space on this PCB to solder this resistor. I attach photos for better illustration. After soldering the resistor, the problem never happened again and I did it over two years ago.
    best regards
    2004 Nissan Micra K12: Unprompted Activation of Front Wipers After Rainfall or Car Wash 2004 Nissan Micra K12: Unprompted Activation of Front Wipers After Rainfall or Car Wash 2004 Nissan Micra K12: Unprompted Activation of Front Wipers After Rainfall or Car Wash
  • #6 17080866
    Rogas28
    Level 2  
    Posts: 3
    Rate: 1
    Thanks for all the answers.

    It turned out that the windshield washer pump was the problem, causing a short circuit when wet. According to the mechanic, in this model the pump has some additional electronics, which started to freak out with moisture. There was an option to replace it with an original new one (cost about PLN 150), or a replacement used in micras for PLN 25. I used option no. two and so far for the last month everything was ok.

    best regards
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  • #7 17081157
    diakov
    Level 2  
    Posts: 2
    Rate: 2
    Glad you managed to fix this problem. I'm afraid it wasn't for long because I also changed the pump twice and the problem kept coming back like a boomerang. In the end, I decided on a solution with a resistor and so far over two years and peace of mind. best regards
  • #8 18373091
    dawid5995
    Level 2  
    Posts: 4
    Rid up the topic, I just wanted to confirm that the resistor method works. I thought it would take place without removing the steering wheel, but unfortunately not. On the plus side, everything went smoothly and without problems. It started with the fact that with prolonged use of the washers, the wipers started to run automatically and recently, with heavy rain, the wipers turned on immediately after starting the car and this decided to insert a resistor in the system. 2004 Nissan Micra K12: Unprompted Activation of Front Wipers After Rainfall or Car Wash 2004 Nissan Micra K12: Unprompted Activation of Front Wipers After Rainfall or Car Wash
  • #9 18377241
    dawid5995
    Level 2  
    Posts: 4
    My joy came prematurely. After installing the resistor, the battery is discharged overnight, where previously there was no problem with firing even after long stops ...
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  • #10 18378329
    decybel91
    Level 43  
    Posts: 7987
    Help: 1020
    Rate: 4191
    I fought with such a case and the cause was the front washer motor. After the exchange, as he took with his hand.
  • #12 18381781
    decybel91
    Level 43  
    Posts: 7987
    Help: 1020
    Rate: 4191
    Exactly like that.
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Topic summary

✨ The discussion revolves around a recurring issue with the front wipers of a 2004 Nissan Micra K12, which activate unexpectedly after rainfall or car washes. The problem began after a hand wash and involves the wipers moving automatically for varying durations after the engine starts. Initial troubleshooting included removing the washer pump fuse, but the issue persisted. Responses suggest that the Body Control Module (BCM) may be defective, and a known solution involves soldering a resistor to the wiper switch board to prevent short circuits caused by moisture in the washer pump. One user confirmed that replacing the washer pump resolved the issue, while others reported mixed results with the resistor method, including battery discharge problems. The discussion highlights the importance of diagnosing the washer pump and BCM for effective repair.
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FAQ

TL;DR: On some Micra K12s, moisture triggers phantom wipes; adding a 3 kΩ resistor on the wiper switch PCB stopped it for years for some users—“the problem never happened again.” [Elektroda, diakov, post #17080515]

Why it matters: This FAQ helps 2003–2010 Nissan Micra K12 owners quickly diagnose and fix wipers that start by themselves after rain or washing.

Quick Facts

What causes my Micra K12 wipers to turn on by themselves after rain or a car wash?

Users traced it to the front washer pump shorting when wet. That interference can trigger the wiper circuit once the engine powers the system. Replacing the pump or isolating its signal addressed the phantom wipes for several owners. [Elektroda, Rogas28, post #17080866]

Why do the wipers start only after I start the engine, not just on ignition?

Owners reported the wipers remain still on ignition, then begin moving after the engine starts. This suggests the fault appears only when engine-run power paths energize, aligning with moisture-related shorts reported by others. [Elektroda, Rogas28, post #16968343]

Is the BCM (Body Control Module) the culprit here?

One commenter suggested a BCM fault, but multiple fixes pointed to the washer pump or stalk circuit instead. If other BCM-controlled features are fine, investigate the pump and wiper switch path first. [Elektroda, piotrekwoj1, post #16969088]

How do I apply the resistor fix on the wiper switch?

Solder a 3 kΩ resistor on the wiper switch PCB between the red (12 V) and black (ground) points. This stabilizes the circuit against the washer pump’s moisture-induced shorting. Photos in the thread show placement and ample board space. [Elektroda, diakov, post #17080515]

Do I need to remove the steering wheel to add the resistor?

At least one user reported removing the steering wheel was required to access the switch comfortably. The work proceeded smoothly once done. [Elektroda, dawid5995, post #18373091]

Will the resistor fix last long-term?

Yes for some. One contributor wrote the resistor solution has worked “over two years,” with no return of phantom wipes. [Elektroda, diakov, post #17081157]

Can the resistor mod cause battery drain?

One user reported the battery discharged overnight after installing the resistor. If this happens, remove the resistor and reassess the washer pump or wiring. [Elektroda, dawid5995, post #18377241]

Does replacing the washer pump actually solve the issue?

Yes for some owners. As one put it, “After the exchange, as he took with his hand,” indicating the phantom wipes stopped once the pump was replaced. [Elektroda, decybel91, post #18378329]

How much should I budget to replace the washer pump on a Micra K12?

One owner faced two parts options: a new OEM-like pump around PLN 150, or a used/swap-in unit for about PLN 25. [Elektroda, Rogas28, post #17080866]

Why do my front wipers stop when I activate the rear washer?

The original poster observed front wipers paused briefly when the rear washer ran, suggesting interaction within the shared control path. This points back to washer-related interference. [Elektroda, Rogas28, post #16969184]

Is this spontaneous-wiper behavior a known Micra K12 issue?

Yes. A member flagged it as a known issue and linked prior discussion dedicated to it. [Elektroda, robin161, post #16969282]

Will pulling fuses stop the wipers from starting by themselves?

The OP tried removing the washer pump fuse and the wiper fuse. The behavior persisted, indicating the root cause sits deeper in the control path. [Elektroda, Rogas28, post #16968343]

What is the BCM in simple terms?

The BCM is the Body Control Module. It supervises various body electronics, including wipers. Some suspected it here, but fixes targeted the pump and switch. [Elektroda, piotrekwoj1, post #16969088]

Is there a quick 3-step process to try the resistor approach?

  1. Remove trim to access the wiper switch PCB. 2. Solder a 3 kΩ resistor between the red (+12 V) and black (ground) points on the PCB. 3. Reassemble and test wipers and washers for normal behavior. [Elektroda, diakov, post #17080515]

What’s an edge case I should watch out for when modding the switch?

After a successful initial result, one user later experienced overnight battery drain. If you see this, revert the mod and inspect the pump. [Elektroda, dawid5995, post #18377241]

If replacing the pump worked at first but the problem returned, what next?

One owner said two pump swaps didn’t hold. They then added the 3 kΩ resistor at the switch and reported over two years trouble-free. [Elektroda, diakov, post #17081157]
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