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Old 10-22-2019, 05:19 PM   #5
fdryer
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Join Date: Jan 2006
Location: NYC
Posts: 43,242
 

2003 L-Series 3.0L Sedan
Default Re: 2007 Ion Alarm/horn starts blowing by itself

The body control module runs everything the engine computer doesn't. The abs and airbags have their own electronic control modules. If the possessed doors isn't a flaky door lock/unlock switch making intermittent lock/unlock issues grin severe wear, these problems seem to point to the bcm. Examining all connections to the bcm may reveal something but be sure battery power is disconnected. All electronics modules have live memory for storing temporary error codes. Electrically, every module isn't powered off so disconnecting battery negative is the safe way to working on expensive electronics.

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