Question about Toyota Camry

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I installed a back up alarm. After six months it started to sound when ever the car was cold. It is getting worse. Nothing is behind the car, but it keeps sounding. The mechanic can't "reproduce the problem" The alarm is a year old and hasn't been working for 6 months.

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  • smithwic Aug 02, 2008

    How do you clean out the stuff?  There's a small box by the steering wheel that gives the visual signal and 4 sensors in the bumper.  It seems its only one of the sensors giving her problems and she thinks that when the inside of the cabin warms up, the problems ceases.  We see no brand name and we don't know where and what to clean.



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Without knowing the exact make and model of the "back up" alarm, most suggestions would be generic.

Generally, alarm needs triggers to activate. Most designs uses the existing triggers of the car such as the door switches. They are the same switches that activates the dome light. Having said this, it is possible that these switches have to be look over. Some other alarm models incorporate a motion detector and/or a sound level detector (glass).

Based on the above, it is suggested that your first course of action would be to check all these triggers (switches).

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards.

Thank you for using FixYa.

Posted on Jul 30, 2008

  • Louie  Role
    Louie Role Jul 30, 2008

    Hi again,

    I re-read your post, were you referring to a backing up alarm and not a backup alarm? If yes then above describe solution is only partially applicable.

    Your backing up alarm has a proximity detector, what is happening is that this detector get overly sensitive when cold and there erroneously triggers. Perhaps, the services you should seek is not an auto mechanic but an electronics tech. The backing up alarm must be opened and the electronics inside checked. Often culprit would be dust and grime that has somehow entered the casing of the sensor. this then when cold becomes conductive and changes the sensitivity of the proximity detector and therefore falsely triggering the alarm.


  • Louie  Role
    Louie Role Aug 02, 2008

    Appreciate the update.

    Further to this would require familiarity with electronic components and circuitry, use of a DVM and eventually even perhaps a soldering iron. When cold (damp), most materials tend to have a lower electrical resistance. It is very possible that some of the components inside the box and/or one of the bumper sensors is deviating from specs (when cold). One way of determining this is to open the box/sensor and do a passive test (at ambient temperature) of the components (resistors, transistors, capacitors, inductor, diodes and others). Thereafter, spray the same components with instant freeze or any aerosol product that lowers the temperature and perform the same test again. Any component that should considerable change in value would most likely be the culprit.

    In some instances, it could just be accumulated dirt/dust bridging the component leads/pins and simulates a resistor when cold (damp).




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