2002 Sonata: Cruise light on but Cruise Control won't engage via steering wheel

Discussion in 'Hyundai Sonata' started by Thee Chicago Wolf (MVP), Jan 16, 2011.

  1. So this is a weird one. Just the other night I was on the highway
    ready to use cruise control and found it did not want to engage. The
    last time I remember using it was in late December or so. The Cruise
    button to the lower-left of the steering wheel illuminates but when I
    press the Set Coast button on the steering wheel I don't get the green
    Cruise Control indicator next to the speedometer. I can't imaging this
    being a fuse or something. Anyone got any idea what I should check?
    Thee Chicago Wolf (MVP), Jan 16, 2011
  2. Thee Chicago Wolf (MVP)

    Partner Guest

    Check your brake lights all around to make sure they are working properly.
    Partner, Jan 16, 2011
  3. My mother-in-law was tailing me to a restaurant today and noted I had
    a couple lights out. If that IS it, it would be really, REALLY dumb
    for Hyundai to have tied the circuit for cruise control to a
    tail-light. I'll report back when I change them.
    Thee Chicago Wolf (MVP), Jan 16, 2011
  4. Thee Chicago Wolf (MVP)

    Ed Pawlowski Guest

    Not so dumb, many (most?) car makers do that including my previous Mercedes.
    It is important to have the cruise control kick out when the brake is

    What is dumb is to not have replaced those lights already. It can save you
    getting rear ended.
    Ed Pawlowski, Jan 17, 2011
  5. ?
    Yes, having no working brake lights can prevent getting rear-ended but
    come on...really? There are three sets of brake lights on my Sonata.
    Whether your brake light(s) is out or not, it should not kill
    functionality outright. It should still work regardless. It's the
    functional equivalent to having a dash light go out and your a/c not
    turn on until it gets replaced. Two of my three brake lights were
    operational. The system should be designed such as to continue to work
    in the event of a non-related function failing. It's dumb. Turns out
    it was not a brake light, just one of the regular bulbs adjacent to
    the brake light. Again, dumb. How many unscrupulous dealerships or
    repair shops do you think would charge hundreds of dollars to "fix"
    the cruise control because of this engineering intelligence lapse?
    <shakes head>

    - Thee Chicago Wolf [MVP]
    Thee Chicago Wolf [MVP], Jan 18, 2011
  6. Turned out to be one of the running lights. Thanks for the heads up.
    - Thee Chicago Wolf [MVP]
    Thee Chicago Wolf [MVP], Jan 18, 2011
  7. Thee Chicago Wolf (MVP)

    Voyager Guest

    I have to disagree. My Chevy pickup is wired such that a brake light
    fuse blowing will prevent the interior lights from coming on. This has
    happened a couple of times (I suspect from water getting in the trailer
    hitch connector, but I am not sure) and I know know that no dome light
    means no brake lights.

    You can argue if the cruise control was the right choice and I would
    have tended to pick something like interior lights as not everyone uses
    cruise regularly, but having something obvious that quits working when
    something less obvious, but important (brake or tail lights) quit
    working is very intelligent engineering.

    Voyager, Jan 19, 2011
  8. Thee Chicago Wolf (MVP)

    Ed Pawlowski Guest

    Think of it as nature's way of letting you know you have a light
    malfunction. Thank an engineer for the thoughtfulness.

    Not the same. The cruise control and the brake system are tied together for
    safety reasons. AC is ties to nothing that will affect your life. It is
    important that the cruise be switched off as soon as you hit the brakes.
    Just ask any runaway Toyota driver :)

    But they are related.

    It's dumb. Turns out
    Automotive electrical systems are rather complex these days. In many cases,
    a switch no longer switches anything, but sends a request to the computer to
    perform a function. I won't even guess what happens in that circuit.

    How many unscrupulous dealerships or
    It can happen, but it can also be a quick way to find out your lights need
    work. Given that all the major auto makers use this type of system, perhaps
    you should let them know you have a better idea.
    Ed Pawlowski, Jan 19, 2011
  9. ?
    I would not have put bulb out and cruise control not engaging
    together. They are mutually exclusive to me. A fuse blow-out I would
    have understood.
    To me the brake system is the calipers/pads, rotors, and brake
    pedal---not the brake LIGHTS. I understand 100% that cruise should be
    triggered to shut off if the brake pedal is depressed. That seems like
    perfectly normal safety behavior. Additionally, the Sonata has a
    cancel button on the steering wheel. The cruise control and brake
    pedal should be tied together. Yes, that makes sense. No cruise
    engaging because a tail/brake light is out? No, dumb. Remember the
    old school Christmas lights where if one bulb burnt out the WHOLE set
    stopped working? Today if one goes out...ONE goes out, not the whole
    string. It keeps on working because it's not in series but parallel. I
    appreciate the debate but I just think it is not smart how it was
    It's not a big deal to have a circuits dedicated to the bulb(s).
    True but bulbs have to be on circuits for the same reason household
    receptacles have to be on circuits. They are analog safety controls
    done, I would imagine, in accordance to common electric wiring code
    and standards to keep the system working in the event of a single
    point of failure and prevent other sorts of overload or damage.
    Save for those who change their oil themselves, most quick lube shops
    let you know you have a light out. AT my last oil change I found out I
    had a plate lamp out. I'm pretty meticulous with my car in terms of
    replacing things at intervals and milestones.

    Hyundai being a giant corporation, I would imagine they have elves
    working the NGs. Perhaps simply displaying a console error message
    when cruise is pressed in the event of a bulb burn-out that says
    "Replace "___" Bulb To Fix/Re-enable Cruise."

    - Thee Chicago Wolf [MVP]
    Thee Chicago Wolf [MVP], Jan 19, 2011
  10. Thee Chicago Wolf (MVP)

    Ed Pawlowski Guest

    They are mutually exclusive to you, but they are integrated to hundreds of
    automotive engineer around the world. This happens on US and German cars
    that I'm familiar with. No matter what anyone says, you are right and
    they are all wrong.

    While dumb to you, see above comment about engineers around the world.
    Evidently (they think) they know something you don't.

    Remember the
    Frustrating when those tree lights go out, but they don't crash or run away
    or apply power to any moving objects if they fail in any way.

    That is possible and cars have had systems that tell you a light is not
    working. That comes down to cost. What are you willing to pay for it?
    Ed Pawlowski, Jan 20, 2011
  11. It's not even that I am right and they are wrong. I just would not do
    it that way because it doesn't make engineering sense to me. I don't
    feel one needs to be an engineer to comprehend such a simple system
    and my differing opinion is no better than the next guy. I don't think
    any engineer is any more or less smarter than I am. I also do not know
    if this a legal requirement by the NHSTA or some similar org to be as
    it is. If it is, then F me because there's nothing I can do about it.
    I went over my owners manual and didn't see any documentation of this
    great "feature."

    Whether one uses cruise control or drives with the accelerator
    depressed to maintain a constant velocity for a prolonged period of
    time, if a brake or tail light is out, it still poses *exactly* the
    same danger of being rear ended. You do agree this is true?

    If I am driving on the highway with my foot on the gas going exactly
    60MPH or if I have cruise control on and I am going exactly 60MPH:
    they are *exactly* the same thing. The driver behind me doesn't know
    the difference. He will only notice I have no brake lights if he
    suddenly starts closing in on me. I'm just saying that whether or not
    a brake or tail light is out, cruise should still work. The person
    driving the car should dictate if a function turns on or not, not a
    light bulb. I mean, we now have the ability in some cars to turn OFF
    our airbags. Do I think it's a good idea, hello no. But again, it's
    there and under the full control of the driver.

    - Thee Chicago Wolf [MVP]
    Thee Chicago Wolf [MVP], Jan 20, 2011
  12. Thee Chicago Wolf (MVP)

    Ed Pawlowski Guest


    Unless one of the engineers jumps in here and explains the reason, we'll
    never know why it is done that way. Years ago, Jaguar used strange
    electrical systems and fuse placement, but they were the only ones and
    eventually came into compliance with common sense. Evidently, since other
    use this system, there may be a very valid reason.
    Yes, but cruising is not the question. It is knocking off the cruise when
    you need braking. It is not necessarilyh done to prevent rear end
    collisions, but to assure the "go" no longer works when you need "stop"

    He may notice you have no tail lights (I'm sure that is what you meant) but
    unless you apply the brakes, he won't know if you have brake lights. Unless
    you apply the brakes, it does not matter.

    It is not done to aggravate the driver, it is probably part of a redundancy
    system to assure the cruise is not on when you need braking.
    Ed Pawlowski, Jan 21, 2011
  13. Thee Chicago Wolf (MVP)

    hyundaitech Guest

    I'll do my best here. It seems the OP has a 2001-2006 Santa Fe, based
    on his description of the switch locations. One of the features of
    this vehicle is that it has an electronic LED center high mounted stop
    lamp assembly.

    The cruise cancel feature is accomplished by monitoring the brake lamp
    switch output. When both brake lamps are burned out, this causes a
    small voltage on the circuit, thus fooling the cruise control module
    into thinking the brakes are applied.
    hyundaitech, Jan 21, 2011
  14. Thee Chicago Wolf (MVP)

    hyundaitech Guest

    Correction-- I see that the vehicle is a 2002 Sonata. Still, it has
    an LED center high mounted stop lamp, so the same theory applies.
    hyundaitech, Feb 3, 2011
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