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2005 Chev Cobalt Keyless Remote Problem

4 messages,  Last post on Mar 26, 2009 at 6:27 AM

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#1 of 4 2005 Chev Cobalt Keyless Remote Problem by majesticwi Mar 17, 2009 (2:28 pm)
I was wondering if it is possible for the wireless key flob to go out of synch with the vehicle's receiver and if so how to re-synch it?   My key flob worked one day and quit the next. Tested the flob's battery and it was good. Tried another battery, no luck there either. The second key flob is in my daughter's dorm room at college so I can't do a comparision to see if it is the vehicle or flob. The only thing that occurred between the flob working and not was that the vehicle was in for an oil change. In fact the flob was used to unlock the vehicle in order to get to the oil change and wasn't used again till the next morning when it didn't work. I was thinking that possibly a fuse was pulled to reset the oil reminder and the keyless remote was reset by accident.   Any info, much appreciated! Replies to this message: okko1 (Mar 17, 2009 2:46 pm) majesticwi (Mar 26, 2009 6:27 am)
#2 of 4 Re: 2005 Chev Cobalt Keyless Remote Problem [majesticwi] by okko1 Mar 17, 2009 (2:46 pm)
Replying to: majesticwi (Mar 17, 2009 2:28 pm) one of mine quit working after about a year and a half. i kept the other in a drawer and when i tried it it worked just fine and i have had no problems. i did ask the dealer last time it was in for service and he said some time if the unit is pressed out of range of the car a number of times it will have te be reprogramed.
#3 of 4 Re: 2005 Chev Cobalt Keyless Remote Problem - SOLVED [majesticwi] by majesticwi Mar 26, 2009 (6:27 am)
Replying to: majesticwi (Mar 17, 2009 2:28 pm) Doing a little research, I got the opinion that the resynching method varied depending on the GM model and model year. I found nothing specific for the Cobalt. What I did was try a combination of methods that worked to resynch the key fob to the Cobalt's receiver. I thought I would pass it along to save others the headache.   1. I removed the RADIO fuse and the BCM (SDM) fuse for 1 minute from the interior fuse panel. The fob receiver is tied in with the power to the radio and the BCM is a module that is tied in with the receiver.   2. Re-install the two fuses.   3. Press the UNLOCK and LOCK buttons on the key fob for 15 seconds, then release.   4. The key fob is now in synch and will work. I don't know if you have to do the "unlock/lock" procedure for all the key fobs as I didn't have the second one available to try. Only ill effect is that you will have to reset the radio's clock and any radio stations that were preset.   You can bet the next time the vehicle goes in for an oil change I will tell them if they don't know how to reset the oil reminder then just leave it for me. *!%#&*!$!#%

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