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Seicento 900 - The dipped beam does not work, the rest are approx

przemonk25 5835 14
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  • #1 16634330
    przemonk25
    Level 9  
    Hello
    The dipped beam headlights have gone out while driving. The rest of the lights (parking, road), indicators, etc. are working properly. Only the low beam does not work. Fuses checked. One was slightly burned. I replaced it. What could be causing the lights not to work?
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  • #2 16634348
    Anonymous
    Anonymous  
  • #3 16634368
    przemonk25
    Level 9  
    Adds a picture of a bulb. Burned out?
    Attachments:
    • Seicento 900 - The dipped beam does not work, the rest are approx WP_20170810_09_36_01_Pro.jpg (531.61 KB) You must be logged in to download this attachment.
  • #4 16634383
    nikusert
    Level 41  
    Hello .
    You can check the bulb (s) with a piece of wire attached to the battery. If good, check the power supply at the lamps, with a lamp made of, for example, 12V / 4W.
    Best regards.
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    #5 16634391
    Anonymous
    Anonymous  
  • #6 16634416
    wojtek1234321
    Level 36  
    szpoak wrote:
    There may also be no voltage from the relay to the dipped beam.

    There is probably no such relay in the 900 hundred, there is "direct" from the switch.
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  • #7 16634443
    przemonk25
    Level 9  
    szpoak wrote:
    The bulb is burnt

    Seicento 900 - The dipped beam does not work, the rest are approx


    Thanks. So both burned :) I will buy new ones and let them know ;)
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  • #8 16634460
    Anonymous
    Anonymous  
  • #9 16634465
    nikusert
    Level 41  
    szpoak wrote:
    And the light switch is not boiling at maximum load (low beam + road)?


    After all, there are H-4 bulbs, and the change is, low beam or high beam are not all together.
  • #10 16634472
    Anonymous
    Anonymous  
  • #11 16634479
    nikusert
    Level 41  
    If I remember correctly, the Seicento did not have light relays. What is the problem to check on the fuses (from the dipped beam headlights) if there is power?
  • #12 16634914
    wojtek1234321
    Level 36  
    szpoak wrote:
    Until I read it out of curiosity because I do not want to believe that Fiat made such a number

    Well, there is no light "switching" relay, only directly from the switch (the so-called spider under the steering wheel. Is it boiling? Well, rather not, I already drive this "invention" as you write, 15 years old and the Fiat itself is 19 there has never been a problem with the lights, and there is no problem with this installation. More problems with this installation are the lack of weight on the rear lamps and in many other places.
  • #13 16635023
    Anonymous
    Anonymous  
  • #14 16635299
    wojtek1234321
    Level 36  
    szpoak wrote:
    Every problem is solvable and Fiat ended up with 126p when Seja did ...
    I mean this noteworthy invention:

    Well, then you are right, I have had the main mass of the engine for a long time - the body is replaced with this one. On the rear lamps, the problem with the mass is that these contacts - pins are too weak, too delicate and very often overheat (I think), the contacts normally turn black, lose contact and the "Christmas tree" is ready, long between the contacts of the rear lamps I made additional ground wires between the ground contact in the lamp (for solder) and the car body, "shortly", so as not to drag the wires like the installation and I have peace with "Christmas trees", (well, it's a pity because Christmas with a Christmas tree is a cool thing :D :D ).
  • #15 16635386
    przemonk25
    Level 9  
    Problem solved ;) I changed the bulbs and it's ok ;) . Thank you for your help
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Topic summary

✨ The discussion revolves around a Fiat Seicento 900 experiencing a failure of the dipped beam headlights while other lights function correctly. The user checked the fuses, finding one slightly burned, which was replaced. Responses suggest potential causes including damage to the light switch, simultaneous burnout of both dipped beam bulbs, or lack of voltage from the relay. Users recommend testing the bulbs directly with a battery and checking the power supply at the lamps. Ultimately, the user resolved the issue by replacing the burned-out bulbs, restoring functionality.
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FAQ

TL;DR: Seicento 900 low beams run “directly from the switch,” not a relay; one owner reports 15 years trouble‑free. Check bulbs, then power. [Elektroda, wojtek1234321, post #16634914]

Why it matters: This FAQ helps Seicento 900 drivers quickly restore dipped beams and avoid misdiagnosis, even when other lights work.

Quick Facts

What usually causes Seicento 900 low beams to stop while other lights work?

Start with the bulbs. In this thread, both dipped‑beam filaments were gone and new bulbs fixed everything. If bulbs test OK, check power at the headlamp connectors and fuses, then inspect the column switch. “Fix the simple things first” works here. [Elektroda, przemonk25, post #16635386]

How can I quickly test if an H4 bulb is blown without fancy gear?

Use a jumper wire straight from the battery to the bulb terminals while observing polarity and avoiding shorts. Alternatively, make a 12V/4W test lamp and probe the bulb and socket. If the bulb lights on a direct feed but not in‑car, chase power and ground. [Elektroda, nikusert, post #16634383]

Is there a dipped‑beam relay on the Seicento 900?

No. “There is … no light ‘switching’ relay, only directly from the switch,” often called the spider beneath the steering wheel. A faulty stalk can therefore drop the dipped beam even when other lamps work. [Elektroda, wojtek1234321, post #16634914]

Can both low‑beam filaments really fail at the same time?

Yes, it can happen. A responder called it unlikely but possible. The OP then confirmed both filaments had failed. Replace the pair to restore symmetry and brightness. Keep spares in the glovebox. [Elektroda, 2920901, post #16634348]

How do I check for power at the dipped‑beam circuit without a multimeter?

Probe the lamp connector or the dipped‑beam fuses using a simple 12V/4W test light. If it lights, the circuit has supply; if not, trace back toward the switch. This isolates bulb versus supply faults in minutes. [Elektroda, nikusert, post #16634383]

Where are the most common weak points besides the bulbs?

Grounds. The rear lamp grounds overheat and go high‑resistance, producing a “Christmas tree” of weird indications. Add short, dedicated ground wires from lamp grounds to the body to stabilize lighting. This also reduces voltage drop. [Elektroda, wojtek1234321, post #16635299]

Will the column light switch overheat without relays?

Owners report long service. One driver has 15 years on the same car with no light‑switch failures. The H4 system selects low or high, not both together, which reduces load. “Is it boiling? Well, rather not.” [Elektroda, wojtek1234321, post #16634914]

Does the Seicento 900 definitely use H4 bulbs for the headlamps?

Yes. Participants identified H4 bulbs in this model. That means each front bulb contains both low‑ and high‑beam filaments. Replace bulbs in pairs to match color and output. [Elektroda, nikusert, post #16634465]

How do I diagnose Seicento dipped beams in three steps?

  1. Test each bulb directly from the battery with a wire.
  2. Use a 12V/4W test lamp to check for power at the headlamp plug/fuses.
  3. If bulbs and power are good, inspect the steering‑column switch and its connector. [Elektroda, nikusert, post #16634383]

What tools do I need for quick roadside troubleshooting?

Carry a short jumper wire with insulated clips and a 12V/4W test lamp. These two items let you confirm bulb health and supply presence fast. They also help distinguish ground versus feed issues without a meter. [Elektroda, nikusert, post #16634383]

After fitting new bulbs, anything else to verify?

Confirm both low beams illuminate, the aim is correct, and connectors sit tight with no heat discoloration. If one side is dim, clean contacts and recheck grounds. The OP reported immediate success after a straight bulb swap. [Elektroda, przemonk25, post #16635386]

Could a bad stalk (spider) switch kill only the dipped beams?

Yes. Since the dipped circuit runs directly through the steering‑column switch, worn contacts or a loose connector can remove power only from that position. Inspect and refurbish or replace the stalk if tests show no feed. [Elektroda, wojtek1234321, post #16634416]

Why do some users worry about load without relays for all lights?

One commenter noted many lamps sit downstream of the switch. However, experienced owners state the setup works and doesn’t boil the switch under normal loads. Design choices and H4 selection logic help. [Elektroda, wojtek1234321, post #16634914]

What’s an example of a failure that doesn’t involve the front bulbs?

Rear‑lamp ground faults can back‑feed and create odd lighting behavior that confuses diagnosis. Add direct grounds to the body to stop heat‑darkened contacts and voltage drop issues. [Elektroda, wojtek1234321, post #16635299]

How rare is a two‑bulb failure, and what should I do?

It’s uncommon but real; this thread documents two failed dipped filaments at once. Replace both bulbs and re‑test before chasing wiring. Keep a spare pair to minimize downtime. [Elektroda, przemonk25, post #16634443]
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