In-Depth Honda Deflation Warning System Description

Discussion in 'Technical Articles' started by Ichiban, Saturday 22nd Mar, 2014.

  1. Ichiban Founder Staff Team

    England CJ Leeds
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    The Overview
    The VSA modulator-control unit detects a state that the pressure of one tyre is relatively lower than pressure of the other three tyres. Deflation detection is performed by monitoring the rotation speed of four wheels.When the system detects the deflation of a tyre (from 10 % to 30 % deflation from recommended pressure), the low tyre pressure indicator is turned on to inform the driver that a tyre is deflated Deflation of two tyres on diagonal position or three tyres are also detectable.To detect tyre deflation with desired accuracy, it is necessary to learn the difference of rolling of the four tyres at recommended pressure (learning is started by initialisation).
    DWS Learning
    To detect a tyre deflation, it is necessary to correct the initial difference of rolling radius of the four tyres at recommended pressure. This leaning is finished by drive the vehicle for about 10 minutes in ideal conditions. In addition, the true performance is not provided while learn it.

    DWS learn1.JPG DWS learn2.JPG

    Deflation Warning System DWS Initialisation

    You can do this prior to engaging your dealer

    Do the deflation warning system initialisation after doing the following items.
    • Rotating the tyres.
    • Replacing the tyre(s).
    • Adjust the tyre pressure.
    • Replace the VSA modulator-control unit.

    Turn the ignition switch to ON (II).
    NOTE: Vehicle must be stopped with the transmission in P or N.
    Press and hold the INFO button (A) for more than 3 seconds to enter the customizing mode.
    Press the INFO button repeatedly until symbol (B) is displayed, then press the SEL/RESET button (C).
    Select ‘‘OK’’ by pressing the INFO button, then press the SEL/RESET button to set.
    NOTE:
    • If ‘‘COMPLETE’’ is displayed in the multi-information display, deflation warning system learning procedure is completed.
    • If ‘‘FAILED’’ is displayed in the multi-information display, go to the symptom troubleshooting.

    CRV Deflation Warning System Initialization.JPG

    DWS Components and Schematics ( please note 3rd Generation is shown but the principle is the same on the 4th Generation)

    CRV Deflation Warning System 1.JPG CRV Deflation Warning System 2.JPG


    If you have any issues on Civic or CR-V refer to this thread first or open a new thread in the respective forum sections.
     
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  2. Beefy Expert Advisor ★ ★ ★ ★ ★

    United Kingdom Stoke
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    you must also have the handbrake applied. with new model CR-V you must press the info button untill the book symbol is on the i-MID, then press sel/reset. only then will the option be avaliable for tyre deflation warning etc.
     
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  3. Beefy Expert Advisor ★ ★ ★ ★ ★

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    having the handbrake appplied applies for all hondas with deflation warning.
     
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  4. Ichiban Founder Staff Team

    England CJ Leeds
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    Thanks Beefy exactly the information we needed! :Hey:
     
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  5. tomwillie Valued Contributor ★ ★ ★ ☆ ☆

    England Tom Royston
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    Can vouch from recent experience that TPMS works well. Light came on so continued a few miles until safe to leave Dual Cway with no hard shoulder & found garage forecourt where could safely check all the tyre pressures. Three at 37psi except os rear at 33psi. Pumped up os rear to 38psi but did not know at the time know how to cancel TPMS warning light so continued with care for 45 minutes then rechecked tyre pressures as all OK continued home for remaining 75 minutes of journey.

    Took car to Norton Way Honda, Letchworth, last Monday as they said just bring the car in no need to book, which is excellent, better still they only charged £15 to repair the puncture caused by an old 1.5 in long by 0.25 in dia. nail.

    I spoke with service manager who said that individual tyre pressure monitoring systems are coming, he also admitted that some owners keep returning with false TPMS warning light problems but did not know why. Could VSA rotors need cleaning?
     
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