Door Locks
Team Owner
Joined: Mar 2008
Posts: 21,502
Likes: 461
From: Southern Utah
My first thought was along the lines of FortMorganAl's...how do you know if the buttons are not working. In other words, what symptom are you seeing. If I sit in my car and push the inside lock button, nothing happens except the beep...and you say you are hearing the beep. It is not like an older car where some mechanism inside the door makes a clunk. All the door lock system does is cut the power to the electric door latch.
Team Owner
Joined: Mar 2008
Posts: 21,502
Likes: 461
From: Southern Utah
I'll try once more: how do you know? What are you actually doing to test it. If it doesn't make any noise other than the beep, and you are hearing the beep, how do you know that it isn't working. If I sit in my car, close the door, start the engine and hit the inside lock button, all that happens is that I hear the beep...nothing else happens. In this same situation, what would you do to prove to a bystander that the lock system is not working. Pretend I am standing in the garage, right next to the car..what exactly would you do to show me that the system is not working? Because if you just sit there and tell me that it isn't working, I'm not going to believe you...you have to show me.
Race Director
Joined: Oct 2010
Posts: 14,475
Likes: 785
From: Las Vegas NV
I'll try once more: how do you know? What are you actually doing to test it. If it doesn't make any noise other than the beep, and you are hearing the beep, how do you know that it isn't working. If I sit in my car, close the door, start the engine and hit the inside lock button, all that happens is that I hear the beep...nothing else happens. In this same situation, what would you do to prove to a bystander that the lock system is not working. Pretend I am standing in the garage, right next to the car..what exactly would you do to show me that the system is not working? Because if you just sit there and tell me that it isn't working, I'm not going to believe you...you have to show me.
Thread Starter
Cruising
Joined: Sep 2014
Posts: 14
Likes: 0
Thanks for your help guys it finally worked after I disconnectef the battery for the 3rd time and left it un-connected for 15 minutes and it worked
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Le Mans Master
Joined: Feb 2007
Posts: 8,514
Likes: 235
From: Currently somewhere in IL,IN,KY,TN,MO,AR,MS,AL, or FL
The difference is all the computers and modules are "industrial" computers and modules rather than consumer versions. They reboot themselves (if there is ever any "booting" done) when they discover an error and disconnecting the battery should do nothing to "reboot" them. There are people who will insist to their dying day that it works but there is no logical reason why it would any more than putting a carrot on the ground 6" behind the front passenger side tire. On the other hand, it shouldn't hurt anything to try until the power surge hooking the battery back up destroys some of the electronics. 
Also, with the power consumption of these cars and the general lack of any need to have uninterruptable power, once you disconnect the battery everything except the headlights and airbag system will be dead in less than a second. Disconnecting for 1 second or 1 week should make no difference.
Also, with the power consumption of these cars and the general lack of any need to have uninterruptable power, once you disconnect the battery everything except the headlights and airbag system will be dead in less than a second. Disconnecting for 1 second or 1 week should make no difference.
Race Director
Joined: Oct 2010
Posts: 14,475
Likes: 785
From: Las Vegas NV
The difference is all the computers and modules are "industrial" computers and modules rather than consumer versions. They reboot themselves (if there is ever any "booting" done) when they discover an error and disconnecting the battery should do nothing to "reboot" them. There are people who will insist to their dying day that it works but there is no logical reason why it would any more than putting a carrot on the ground 6" behind the front passenger side tire. On the other hand, it shouldn't hurt anything to try until the power surge hooking the battery back up destroys some of the electronics.
Also, with the power consumption of these cars and the general lack of any need to have uninterruptable power, once you disconnect the battery everything except the headlights and airbag system will be dead in less than a second. Disconnecting for 1 second or 1 week should make no difference.
Also, with the power consumption of these cars and the general lack of any need to have uninterruptable power, once you disconnect the battery everything except the headlights and airbag system will be dead in less than a second. Disconnecting for 1 second or 1 week should make no difference.
Le Mans Master
Joined: Feb 2007
Posts: 8,514
Likes: 235
From: Currently somewhere in IL,IN,KY,TN,MO,AR,MS,AL, or FL
I know for a fact that disconnecting the battery will reboot and reset the nav HU when it locks up. Mine used to lock up with no response to any buttons and no sound until I disconnected the battery and all went back to normal. It happened several times until replacing the battery and giving the terminals a good cleaning resolved it permanently...so far.
The BCM and ECM are even more important and can't be allowed to lock up. Imagine you're driving down the Interstate and the ECM freezes. That would be really bad. Yet it probably happens more than we would like to think it does and no one notices except for a momentary stutter in the engine that you probably wouldn't even notice. In the C4 disconnecting the battery was a routine procedure to reset the modules but we have come a long way in the past 30 years.