[W126 Coupe] aftermarket keyless go questions

[Jay Hirsch]

Why do you need a "keyless" system?
keep cruisin
Jay H
On Mar 17, 2010, at 11:30 PM, Andrew Seidel wrote:


> Fellow list members,

> I'm preparing to install an aftermarket keyless-go system in my '86  

> 560SEC.  Wondering if I understand the schematics and behaviour  

> correctly:

> Mechanical input (key) activates an electrical signal(to vacuum  

> pump), realizing a mechanical response (pnuematic to all locks),  

> resulting in unlock signal to all inputs of the pump (+12V)to know  

> to shut off, and informational to the alarm?

>

> It seems an aftermarket installation has two choices, as directly  

> grounding an input to the pump, while mechanically the door locks  

> relays are connected to +12V, will create a short and blow a fuse:

> (1) install a solenoid connected to the remote alarm/keyless  

> controller on the driver's side door to realize a mechanical  

> response as if the key had been used

> (2) disconnect an input to the pump at one of the door locks (thus  

> prevent possibility of short), and re-route this input to be  

> controlled directly by the alarm/keyless controller--sound correct  

> that I could use any of the locks?

>

> I don't really understand the input from the driver's door (only)  

> lock: pin 3 "lock" output to pin x1/1 of the pump (also tied to  

> GND).  Seems nothing would happen unless there is a current-sense  

> between x1/1 and the input from the lock x2/2 --and I don't know  

> what it would be doing based on that connection?

>

> I have an Inwells TM3000UM2 unit--made in China, so cheap and  

> almost unusable instructions--it will be suprising if it works.   

> Another thought is to harvest the factory keyless-go computers ,  

> solenoids, etc. from a modern wreck, though I suspect the features  

> are tightly integrated with some main computer which would be hard  

> to (electrically) strap its I/O to trick it in to working inside an  

> SEC, also big $ for a wrecker to let go of a main computer module.   

> Anyone seen/figured-out the keyless-go system of a recent model or  

> looked further in to this?

>

> A later challenge is integrating a starter-disable (the '86 factory  

> alarm doesn't have a disable feature, right?)  Also, a factory  

> "start" button would be nice, so I only need the transponder and no  

> key, but then I need to replace the steering wheel lock with a  

> solenoid/control.  Additional thoughts?

>

> Thanks (sorry for long/multiple questions)!

>

> Andrew Seidel

> 1986 560SEC

> 1985 500SEC Lorinser

> 1983 300D Turbo

>

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