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Blind Spot Monitor Fault BSM

Discussion in 'Gen 4 Prius Main Forum' started by chamkila, Jun 16, 2018.

  1. chamkila

    chamkila Junior Member

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    Guys where are the sensors located, Mine just got a fault. Maybe the sensors need a cleaning before I go to toyota so they can take it look at it. Its still under warranty.

    Thanks again.
     
    #1 chamkila, Jun 16, 2018
  2. Elektroingenieur

    Elektroingenieur Senior Member

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    The ultrasonic sensors are on the left and right sides of the rear bumper, shown as item ⑥ in parts catalog Figure 84-17, Clearance & Back Sonar, and in the illustration on page 326 of the Owner’s Manual (PDF).
     
    #2 Elektroingenieur, Jun 16, 2018
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  3. chamkila

    chamkila Junior Member

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    Thank you. Is it underneath the bumper because the bumper is smooth. And I can't see it
     
    #3 chamkila, Jun 16, 2018
  4. The Professor

    The Professor Senior Member

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    Ultrasonics are highly unreliable in high wind speeds (e.g. travelling at speed), and probably don't have the range to cover the distance required. I think the Blind Spot Monitor uses radar modules behind the corners of the rear bumper...

    Supporting source: 2016 Prius - the next generation of Toyota's technology ambassador - Toyota

     
    #4 The Professor, Jun 17, 2018
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  5. Elektroingenieur

    Elektroingenieur Senior Member

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    That’s a good point. The radar sensors, at about the same locations on the sides of the rear bumper, are shown with Part Name Code 88172 in the second image for parts catalog Figure 84-01, Switch & Relay & Computer.
     
    #5 Elektroingenieur, Jun 17, 2018
  6. Fester

    Fester Active Member

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    Yes they are radars located in each side rear quarter panels. I'm pretty sure the radars are sealed well against the panels on the inside surface, so unless the outside surface of the panels is covered with a lot of mud or dust, thats probably not the problem.
     
    #6 Fester, Jun 17, 2018
  7. RCO

    RCO Senior Member

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    I believe the handbook advises keeping the rear quarter panels clean at all times for them to work consistently well.
     
    #7 RCO, Jun 17, 2018
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