[DMCForum] Re: A strange and disturbing issue

["cruznmd" <racuti1@xxxxxxxxxxxx>]

I followed Elvis Nocita's upgrade procedure. It keeps all of the guts 
of the lock circuit inside the box instead of diodes and relays 
outboard. He claims to have successfully modified several with 
excellent results.

All he did was replace the 1k ohm resistors with 10k ohm resistors, 
Darlington transistors to amplify the sense signal to overcome the 
new resistors (I hope I got that part right) and replaced the relays.

With the module positioned so that the capacitors are at the top, the 
1k ohm resistors are inner ones just under the caps.

Specifically, the transistors he recommended were SOT-32 PNP's. Rad 
Shack didn't have them so I bought larger ones, just overkill but he 
says they won't harm anything.

My module tests great but my driver's door solenoid is toast and I 
haven't replaced/repaired it yet.

Rich A.
#5335

--- In DMCForum@xxxxxxxxxxxxxxx, "ryanpwright" <yahoo1@xxxx> wrote:
> Thanks guys.
> 
> Rich hit the nail on the head. Someone on the DML said the same 
thing.
> Today my passenger side door lock decided to act up on me, only
> working some of the time. I disconnected the lock module.
> 
> I'm going to replace the relays & diodes in this sucker tonight and
> see what I can come up with. Rich, what did you do to upgrade your
> module? I'd just planned on dropping by the Rat Shack and buying a
> couple of sealed automotive relays & diodes. Perhaps some resistors 
&
> transistors to drop the standby voltage, too, while I'm at it.
> 
> -Ryan
> 
> --- In DMCForum@xxxxxxxxxxxxxxx, "cruznmd" <racuti1@xxxx> wrote:
> > Based on the time interval you describe it sounds like your lock 
> > module. The thermal trip takes about that long to reset and pop. 
Mine 
> > was doing it recently until I upgraded the lock module.
> > 
> > Rich A.
> > --- In DMCForum@xxxxxxxxxxxxxxx, "ryanpwright" <yahoo1@xxxx> 
wrote:
> > > On my way home this evening, it was raining. I pulled into my 
> > garage,
> > > turned the headlights off, opened my driver's door and shut 
down the
> > > engine. I was enjoying a song and left the key on "accessory" 
for 30
> > > seconds or so. I then realized that I still had the mode switch 
in
> > > "defrost" and the fan blowing, so I flipped the mode switch 
to "off"
> > > to save my battery.
> > > 
> > > I then heard a new noise that I hadn't heard before. Every 15-20
> > > seconds or so, a relay would click somewhere behind me and my 
> > interior
> > > lights would dim slightly. The relay would stay energized for 2 
to 3
> > > seconds, then go off. I could hear a weird "buzzing" noise 
behind my
> > > head when it was engaged. After a few rounds of this, I shut 
the 
> > radio
> > > off but left the key in "accessory". I got out of the car and 
found
> > > where it was coming from, but I have no idea how or why.
> > > 
> > > With my door fully opened, the upper rear (closest to engine) 
corner
> > > of the driver's side door comes into gentle contact with the 
roof
> > > t-panel. When this relay - whatever it is - engaged, it was 
causing 
> > an
> > > electrical short between the t-panel and the door! Since the 
car was
> > > wet from the rain, the sound I was hearing was water being 
vaporized
> > > from a few cm or so around that contact point! I observed this 
> > through
> > > several cycles of the relay to be positive of what I was 
seeing. 
> > > 
> > > Further troubleshooting:
> > > 
> > > - I partially closed the door to eliminate the contact with the
> > > t-panel and waited for the relay to engage. It did so, this 
time 
> > with
> > > no water vaporization. All I heard was the click of the relay. 
> > Letting
> > > the door back up, it went back to vaporizing water.
> > > 
> > > - I turned the key to "off", then back to "accessory." The 
relay did
> > > not continue to engage every 15-20 seconds. I did not restart 
the 
> > car
> > > to test as I was now in my closed garage and was also eager to 
come
> > > write this post before I forgot the details.
> > > 
> > > So, questions:
> > > 
> > > 1. What could this relay be?
> > > 2. What could be causing it to short against the door like this?
> > > 
> > > I believe something is wrong here.
> > > 
> > > -Ryan

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