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DSP Guru’s Car Computer Drowns

November 14, 2007

Do your board-level designs work well when soaked? For how long? Maybe you never even considered this question. Maybe you think you shouldn’t need to answer such a dumb question. Isn’t it someone’s job to keep the water off your circuit boards?

These questions occurred to BDTI’s DSP guru Jeff Bier when his 2001 VW Passat went beserk. The culprit? An engine-control unit (ECU) located too near a water leak in his car’s sunroof. Read the sad story here.

 

Posted by Steve Leibson on November 14, 2007 | Comments (6)

April 16, 2010
In response to: DSP Guru’s Car Computer Drowns
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November 19, 2007
In response to: DSP Guru’s Car Computer Drowns
Todd commented:

Agree that the placement is questionable, WV is not alone though. My 1999 Chevrolet Cavalier has it in front of the passenger side tire in the fender, accessible from under the car. Well sealed so water is not much of a concern but a minor fender-bender could make the car un-drivable. Overall I am fairly happy with the car but grumble ever tine a front turn signal ling needs to be replaced.


November 19, 2007
In response to: DSP Guru’s Car Computer Drowns
Bob commented:

You can't blame it all on VW's design (though it is a weird idea to put the electronic components in the lowest point of the car where it can easily be drowned). I am sure they included a notice in the user manual informing you that you should clean the gutters once a year or so. Maybe the garage should do it when they service the car.


November 18, 2007
In response to: DSP Guru’s Car Computer Drowns
Yup commented:

Older Holden Commodores suffer dry joints, I was offered a job - resolding used ECUs full time. All ECUs should have conformal coating to prevent water damage. I know that JDM AE101 Corolla ECUs suffer leaking capacitors. This eats up the tracks and pads big time. Cracks me up that early twin cam Corollas ran to 8200rpm with 1k of code!


November 17, 2007
In response to: DSP Guru’s Car Computer Drowns
josyb commented:

They [VW and the repair shops] have to make a living, at $1200 for a (est.) $100 worth of electronic components this is quite profitable. My colleauge's ECU of his Opel went dead after 150000 km, and the technician dryly aknowledged they all did! This one happened to have a broken track. They charged EUR 350,- for a 'repaired' one, and this without labor ...


November 16, 2007
In response to: DSP Guru’s Car Computer Drowns
Steve Cahill commented:

Jeep had a recall (1998 Cherokee) to move the computer out from under the driver's seat, to prevent this same drowned-electronics problem. Hard to believe that VW wouldn't be at least as responsive as Jeep was, especially since VW seems to have the added risk with sunroof drains.

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