Re: 4wd will not lock in - 1996 Chevy Pickup

On Tuesday, October 16, 2007 at 4:55:52 PM UTC-7, bb wrote:
> "Steve Austin" <[email protected]> wrote in message
> news:[email protected]...
> > SnoMan wrote:
> > > On Wed, 03 Oct 2007 13:42:34 GMT, "bb" <[email protected]> wrote:
> > >
> > >> "SnoMan" <[email protected]> wrote in message
> > >> news:[email protected]...
> > >>> On Mon, 01 Oct 2007 13:28:53 GMT, "bb" <[email protected]> wrote:
> > >>>
> > >>>> I grounded pin 13 and lights flash once and go out. I looked for the
> > >> TCCM
> > >>>> to reseat the connector but not sure what it looks like. I found a
> unit
> > >>>> under the dash that is on a little bracket that just rests in a
> grove.
> > >> It
> > >>>> is located just to the right of the driver, above the gas peddle and
> just
> > >> to
> > >>>> the left of the AC duct. I could not see how to get that thing out
> > >> though
> > >>>> and remove the connector. If that is it, any advice on how to remove
> and
> > >>>> what could be the problem would be appreciated.
> > >>>
> > >>> You have found the TCCM module. As far as removing it, manual says
> > >>> there is 2 screws holding it in and thaey have to be removed to lower
> > >>> unit to gain access to connector on it. (screws remvove from driver
> > >>> side and at bottom of bracket)
> > >>>
> > >>> -----------------
> > >>> TheSnoMan.com
> > >> SnoMan, Thanks for all of the help but one more question. If there
> are no
> > >> codes, is the connector the likely problem? Do the wires from the TCCM
> go
> > >> directly to the actuator or is there a relay somewhere in the path.
> The
> > >> TCCM doesn't come out very easily.
> > >>
> > >> Thanks,
> > >> Bobby
> > >>
> > >
> > >
> > > There is a switch on Tcase that activates a relay that engages front
> > > axle. Tcase engages first because it has a syncronizer to bring fron
> > > axle shaft up to speed first so that actuator can then be engaged.
> > > -----------------
> > > TheSnoMan.com
> >
> > No relay. Just a switch on the t-case. The brown wire is power. The
> > light blue wire runs to the front axle actuator. The grey and black
> > wire is a signal to the pcm.
> I finally got back to looking at the truck again and did some surfing. I
> called the Chevy house and the guy there said he didn't see just a switch
> listed. Do I have to change the assembly or is the switch servicable (clean
> contacts)?
> thanks again,
> Bobby