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  1. Alarm Lights and Horn Not Working

    Problems and Service
    A few days ago I disconnected the negative terminal on my 2007 Cobalt SS/SC battery to do some work in the engine. It was off for about 2 hours. When I reconnected the battery my alarm lights no longer worked. I went into setting on the dash and made sure the horn and alarm lights were set to...
  2. Security Alarm Problem

    Problems and Service
    My wife has an 05 Cobalt LT. The horn does not work and I think it is related to the next problem. When you unlock the door or the truck (with the key, we have no remote) the 4 ways flash for about 15 seconds. I think the horn was disconnected because of this. I have no clue why they do...
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