Question about 2003 Mitsubishi Lancer

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Fan stays on when car off

When I turn the car off and take the key out the air vent fan stays on and drains my battery. completely random...doesn't do it every day. sometimes takes car days to die, sometimes takes an hr to drain. in fall I sprayed wd40 into the keyhole and worked it lasted a couple weeks with no problems. replaced ignition switch, problem still persists.

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  • Michelle Leittl
    Michelle Leittl Feb 10, 2014

    also, nothing else stays on in the car, only the air vent fan. brand new battery, alternator was checked.

  • Brad Brown Feb 10, 2014

    I wont say that wont be the issue. But given that it is just the fan that stays on and usually an ignition switch shows a lot of other issues.



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This is most likely a bad BCM. That is a body control module. They control all the inside aspects of the car much like the ECU controls the engine.

Posted on Feb 10, 2014

Testimonial: "does a bad bcm fit in somehow with spraying wd40 into the keyhole and it working better? the air fan shuts off much more and it dies much much less. I was thinking of replacing ignition cylinder and keys. my main key is kinda worn and my new key seems to work slightly better, if at all. thanks for your suggestion :)"


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Posted on Jan 02, 2017

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SOURCE: I have an 2001 galant

not sure these are related. battery light is due to alternator failure. Oil light is due to oil pump wear. The oil pump may work OK for a couple more years. Replace it if it gets much worse (if light comes on above 1000 rmp). The alternator must be replace now.

Posted on Sep 07, 2010

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SOURCE: something is draining the battery lights & RADIO stAY ON AFTER IGNITION IS OFF

Check the connecter of you battery. There's a good chance your battery connecters are loose, or another problem with your battery connecters.

Posted on Jun 24, 2012

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There could be multiple issues here and it's hard to say without really looking/running numbers - is there power (lights/dash symbols/etc) when you turn the key? Or completely dead?

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