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Cruise Control Problems?

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by bwilson4web, Feb 19, 2010.

?

Has cruise control required restarting Prius

Poll closed Mar 21, 2010.

  1. Yes - I've had this happen (please add details)

    0 vote(s)
    0.0%

  2. No - never seen it

    12 vote(s)
    92.3%

  3. Something else - please provide details

    1 vote(s)
    7.7%
  1. bwilson4web

    bwilson4web BMW i3 and Model 3

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    A user reported this symptom with their cruise control:
    Has anyone else seen this symptom?

    This is not the Woz problem of incrementing and decrementing speed and having a delayed application of these change requests at one time.

    RECOMMENDATION

    If possible, perhaps you could drive to a dealer service center with the problem and keep them from turning off the car. Have their service technician or staff confirm the problem. In theory, they should be able to plug in their diagnostic system and capture 'live data' from the problem.

    The cruise control consists of:

    • set of resistors in series within the stalk assembly
    • stalk switches that tap different parts of the resistor network
    • wiring harness
    • control computer line that reads the resistance values
    If I were trying to diagnose the problem, the first step would be to read the resistor network values and look for noisy contacts. If the values are marginal, swap the stalk. But having the problem clear by power-cycling the car points towards the control computer.

    All I can do is suggest that every time it fails, write your notes including as many environmental conditions as possible (aka., time, weather, miles or time before failure, internal temperature setting) and when you get back, make a service call at the dealer. This also establishes a rate. What this does is make a formal log so the dealer has backup to justify 'parts swapping' and escalation.

    Eventually, it becomes time to escalate the problem to their next service level. It is a negotiable point to work with the dealer.

    It would be nice if we could move this sub-discussion to Maintenance.

    Bob Wilson
     
    #1 bwilson4web, Feb 19, 2010
  2. Tom183

    Tom183 New Member

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    I have had an issue where the cruise is set, and I use the gas pedal to accelerate temporarily, then when I lift off it's like the cruise forgets where it was set and just drops down way below where it had been - even though the "set" light is still on.

    Also (maybe this is by design), whenever I shut off the car, the cruise switches off - next time I start, it has to be turned on again. annoying.
     
    #2 Tom183, Feb 19, 2010
  3. bwilson4web

    bwilson4web BMW i3 and Model 3

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    I may have seen that but I need to retest.

    If the car drops below 23 mph, it forgets all settings. I wish it would go as low as 10 mph for some of my engineering studies.

    Bob Wilson
     
    #3 bwilson4web, Feb 19, 2010
  4. vday

    vday Member

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    Is it possible that the gear shift is in B rather then D
    It happened to me a few times
     
    #4 vday, Feb 19, 2010
    1 person likes this.
  5. glenmcafee

    glenmcafee New Member

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    Happened to me last night. I have owned my 2010 Prius for two days and it wouldn't engage the cruise control. However, when i restarted this morning, the symptom was gone and all was well. Have you found a solution yet?
     
    #5 glenmcafee, May 27, 2010
  6. Armywife

    Armywife New Member

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    All cars that I have owned did that, any change in speed, acceleration or braking would turn off the Cruise Control even if the light still said set. A Blazer, Optima and the Prius. I thought that was just how it was...
     
    #6 Armywife, May 27, 2010
  7. glenmcafee

    glenmcafee New Member

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    Thanks to the suggestion from vday, I determined that if I had downshifted using 'B', the Prius stays in 'B' even though it operates normally and you thinkyou're in 'D'. So, simply popping the gear back to 'D' worked and I was able to engage Cruise Control.
     
    #7 glenmcafee, May 28, 2010
  8. Martin37

    Martin37 New Member

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    Cruise control does NOT work in B!
     
    #8 Martin37, Jun 10, 2010
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