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Brake activated central door locking, Yes or No? 

 

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 Post subject: Brake activated central door locking, Yes or No?
Posted: Mon Mar 26, 2007 8:27 pm 
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I have just finished installing an after market keyless central door locking system and wondered what anybody thought of the automatic brake activated locking.

The brain box registers the signal from the accessories line and then locks the doors the first time the brakes are used after 30 seconds. It just seems odd (to me anyway) to have the car automatically lock the doors when traveling.

I have linked the signal wire up to the brakes, I always follow installation instructions to the letter, but if this is considered a "Bad Thing" (tm) I'll disconnect it.

Any thoughts either way?

 

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Posted: Mon Mar 26, 2007 8:31 pm 
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i have seen this before i think is not a good idea, if you were in an accident and you were knocked out no body could open the doors to get you out..
bad idea i'd disconnect it..

 

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Posted: Mon Mar 26, 2007 9:25 pm 
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my alarm used to lock the doors a few seconds after ignition. other than the above reason ther isnt anythign really bad about it, if you are either in the habit of locking the doors while driving or if you drive through "bad" areas - its a great idea.

Also people who get a ride with you for the first time think your going to kidnap them or something, i had a LOT of people ask me "why did you just lock your doors" with a hint of worry in their voices :)

 

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Posted: Mon Mar 26, 2007 9:28 pm 
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The old NA used to do that with an aftermarket alarm system fitted.

The downside was that once the car was started and you were OUTSIDE the car, you could lock the keys in there (by closing the door).

It happened to my mechanic when it was on the hoist - so he just raised it up and disconnected the dizzy lead.

 

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Posted: Mon Mar 26, 2007 10:11 pm 
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JOSE wrote:
Also people who get a ride with you for the first time think your going to kidnap them or something, i had a LOT of people ask me "why did you just lock your doors" with a hint of worry in their voices :)


when i put my arm on the window (everytime i drive) i lock it. same thing happens. pretty funny most of the time.

 

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Posted: Tue Mar 27, 2007 12:59 am 
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Just one other thing, the instructions have the signal wire for the indicators to flash going to both indicator lines, but I figure that would just short them together so both sides would ALWAYS blink, even when just driving and indicating to turn.

I reckon there would have to be a couple of non-return diodes in place, but none were supplied and I'm not sure what value diode I should get.

Anybody know?

BTW, have taken brake signal wire off, the bit about accidents is valid, I think. **Edit** Not that I've had any for a few decades, but you never know, do you?

 

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Posted: Tue Mar 27, 2007 7:17 am 
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Unless you're driving through The Projects or New York, i'd say that the feature is more dangerous than any safety benifit its suppose to provide.

The wires to the indicators usually have a diode concealed inside them already. If not, the 1N5401's would be a good choice, rated at 3A.

 

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Posted: Tue Mar 27, 2007 10:22 am 
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EBGizmo wrote:
Unless you're driving through The Projects or New York, i'd say that the feature is more dangerous than any safety benifit its suppose to provide.
Agreed, tis why I disconnected it last night ..

EBGizmo wrote:
The wires to the indicators usually have a diode concealed inside them already. If not, the 1N5401's would be a good choice, rated at 3A.
Unfortunately, this system only provides a single wire, I would need to provide any additional bridging wire, or loop the existing across both indicator lines. Either way, still shorts it, I double checked by wiring it up last night and sure enough, got hazard style blinkers when using indicator stalk.

I bought the system from Autobarn (high end, keyless, alarm/cdl kit), might ask them to supply the diodes as they do installs and the box clearly states that ALL parts required are included. Their least option would be showing me how the in-house installers get around it.

 

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Posted: Tue Mar 27, 2007 2:37 pm 
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it's common practice in countries like south Africa (where I'm from) as you can expect your door to be opened by someone else when you at the traffic light if there not locked.

 

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Posted: Tue Mar 27, 2007 5:09 pm 
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The kit you have is probably meant to be used on the parking lights instead of the indicator lights. My Viper was like that, but the parking light flash looked stupid so I used a relay to flash the indicators instead. Make sure the current draw on the wire is not too much if you are going to power 4 lights with it. The onboard relay might not like it.

 

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Last edited by EBGizmo on Tue Mar 27, 2007 8:43 pm, edited 1 time in total.

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Posted: Tue Mar 27, 2007 8:26 pm 
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I had an alarm years ago that had the anti car jacking feature that you are referring to, after a while you get used to it but your first time passengers may find it a little odd.
The other option regarding the indicators is to use 2 small relays 1 for L and 1 for R indicators, this will work fine from 1 signal wire...

 

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Posted: Tue Mar 27, 2007 8:45 pm 
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Or use a single DPDT relay. Connect both commons to positive. Connect one Normally Open contact pole to the left, the other Normally Open pole to the right. They'll only be connected together when the relay activates.

 

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Posted: Wed Mar 28, 2007 2:51 pm 
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Thankyou people, for your input, great help to me.

I've connected the signal wire to a couple of regular auto relays I had lying about. The signal line probably has enough juice to run all four globes, but, as I had the parts already, it was less stress this way on the electrical system.

As for the "safety" feature for the central locking, I reckon I'll leave it disconnected for now. If my daughters ever use my car, when they get their licences, I'll reconnect it then - maybe. It depends on what they reckon then too.

 

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