central locking

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wammers said:
The only thing the older RF units can keep awake is the BECM. Locks will not activate unless a genuine code is recieved, the BECM decides what is a genuine code not the RF unit.
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Sorry, that is not correct, a failing RF receiver can cause the lock motors to burn, it something that has been well established.
It does not always need a signal from the FOB to do this, the output stage of the receiver appears to fail in a mode that bombards the BECM with signals causing general confusion.
 
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wammers said:
The RF receiver is just that, a receiver, as far as i am aware. Waking up the BECM it can and does do to check if the signal it recieved is the correct code. Until it gets the correct code the BECM will not operate the locks. Maybe the RF reciever loses it's discrimination and spurious signals can mimic the correct code i don't know. Maybe Keith can expand on that, i don't really know enough about electronics and radio.
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That was my suspicion, the filtering was so far out a spurious signal(s) was getting through and confusing the BECM causing it to cycle the locks. It won't take a lot to burn the actuator motors out as the brushes are absolutely miniscule.
 
Datatek said:
Sorry, that is plain wrong, a failing RF receiver can cause the lock motors to burn, it something that has been well established.
It does not need a signal from the FOB to do this.
Click to expand...

Not saying it's not. But the BECM decides what is a good code not the RF reciever. That is the point being made, the BECM won't drive the locks until it thinks it has received a proper fob code. Or are you saying the RF reciever can cause the locks to burn without receiving any signal at all whether from fob or an outside source?
 
wammers said:
Not saying it's not. But the BECM decides what is a good code not the RF reciever. That is the point being made, the BECM won't drive the locks until it thinks it has received a proper fob code. Or are you saying the RF reciever can cause the locks to burn without receiving any signal at all whether from fob or an outside source?
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Yes. What is more, it is perfectly possible to confuse the BECM into doing things it should not do:eek:
The receiver contains an access code plus, I suspect the last rolling code generated, so when it goes berserk it may actually be sending a valid code. Not sure about the last bit yet though.
 
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Datatek said:
Yes. What is more, it is perfectly possible to confuse the BECM into doing things it should not do:eek:
The receiver contains an access code plus, I suspect the last rolling code generated, so when it goes berserk it may actually be sending a valid code. Not sure about the last bit yet though.
Click to expand...

I really prefer oily things. :D:D:D
 
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