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Automatic Door Locks

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Old Oct 2, 2016 | 02:54 PM
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Default Automatic Door Locks

My C5 is a 2002 with 18k miles. This year I noticed the door locks don't always lock or unlock. There doesn't seem to be any pattern that I can see. With the remote or door lock button, sometimes both doors lock and sometimes only the driver side will lock. Same on the unlock. I'm reluctant to remove the door panels (mostly because I'm not sure how to do it correctly without breaking something) to see if there's a bad connection or a lubrication issue. The car has never been in for service since new except for normal things like oil changes, etc. Does anyone have any magic solution or recommendation to this problem? Thanks in advance!
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Old Oct 2, 2016 | 02:58 PM
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Originally Posted by jstaffon22
My C5 is a 2002 with 18k miles. This year I noticed the door locks don't always lock or unlock. There doesn't seem to be any pattern that I can see. With the remote or door lock button, sometimes both doors lock and sometimes only the driver side will lock. Same on the unlock. I'm reluctant to remove the door panels (mostly because I'm not sure how to do it correctly without breaking something) to see if there's a bad connection or a lubrication issue. The car has never been in for service since new except for normal things like oil changes, etc. Does anyone have any magic solution or recommendation to this problem? Thanks in advance!
Are you talking about the FOB or the switch on the driver's door? I have always had to press the FOB twice to get the passenger door to unlock (it's probably supposed to work that way?)
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Old Oct 2, 2016 | 03:07 PM
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Originally Posted by jcgunn
Are you talking about the FOB or the switch on the driver's door? I have always had to press the FOB twice to get the passenger door to unlock (it's probably supposed to work that way?)
Yes the FOB....not remote. You're right about hitting the unlock button twice on the FOB. That doesn't always work now. The button on the door panel also doesn't always unlock the passenger door...and sometimes the driver side door. Kind of a random thing. I'm not sure but I don't think I hear anything coming from the door panel when it's not working.
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Old Oct 10, 2016 | 10:09 PM
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Default Door lock fix

Originally Posted by jstaffon22
My C5 is a 2002 with 18k miles. This year I noticed the door locks don't always lock or unlock. There doesn't seem to be any pattern that I can see. With the remote or door lock button, sometimes both doors lock and sometimes only the driver side will lock. Same on the unlock. I'm reluctant to remove the door panels (mostly because I'm not sure how to do it correctly without breaking something) to see if there's a bad connection or a lubrication issue. The car has never been in for service since new except for normal things like oil changes, etc. Does anyone have any magic solution or recommendation to this problem? Thanks in advance!
Had the same problem on a very low mileage car.. Never used the pass side lock, probably the problem, lack of use?? Using info found on this forum, removed door panel(easy), found and removed circuit board in door(again, easy) , found relays (2 of them) decided to replace both. Desoldered and took to local tech retailer and they had the the exact same relays( only made in USA , the orginials made in Thialand) USA ones where much heavier. Resoldered in place and sealed surface with clear silicone (probably water proofing), works perfectly. Dealer in Canada wanted $400 for a new board, new relays $5, quiet a difference.. 2003 coupe quicksilver
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