message showing and the 4WD buttons do not work, none have light on. What
is usually the problem? Any help appreciated.

"PM" <prmemail-news (AT) yahoo (DOT) com> wrote

Quick and dirty - try to disconnect the battery for a short time. Reconnect
it and see if your 4WD controls again work.

--

-Mike-
mmarlowREMOVE (AT) alltel (DOT) net

Have a scanner read the codes, if you want more specific answers.
Condition
Some customers may comment on intermittent illumination of the "Service 4WD"
light. Upon investigation, the technician may find DTC C0374 set. The
customer may also comment on intermittent erratic operation of the 4WD or
AWD system after driving through rain/snow or simply going through a car
wash.

Cause
The speed sensor signal may have become corrupted. Possible openings in the
speed sensor wire insulation (twisted pairs) can allow water intrusion.
Also, wire connections contaminated by water may result in short circuits
and erroneous speed sensor readings. This most often occurs on the rear
speed sensor circuit.

Correction
Inspect the wiring harness to the transfer case speed sensors.
On the full-size pickup and full-size utility models, replace the 2.2 m (88
in) pigtail harness that runs from the C151 connector under the hood to the
transfer case.
The smaller transfer case harness splices into the larger chassis harness a
few inches in front of the crossmember. The chassis harness routes along the
left side of the frame under the driver door area. Use nylon tie straps to
secure the fabricated harness to the main chassis harness between the
transfer case
Do not over-twist the two wires in the replacement harness.

Check all grounds for poor connection. Also inspect the engine grounds, as
other components grounding through suspect grounds can then seek other
ground paths and interfere with transfer case operation. Battery cable
engine grounds as well as grounds located on the back of the engine cylinder
heads and engine block are possible sources of this concern

PM wrote:

You can start by pulling 4WD fuse in the panel under the hood.
Sometimes it's called "ATC", sometimes it's "4WD". Pull it for
about a minute and re-install. If you get your lights back, you may
need a software reflash. In any case, guessing is not going to really
solve the problem. Vehicles these days are just too complex to be
throwing parts at them without even scanning for codes.

Ian

On Feb 28, 12:36 am, "PM" <prmemail-n... (AT) yahoo (DOT) com> wrote:
I had that problem also. It turned out to be the 4WD switch on the
dash. I removed the switch and had to resolder the connections inside
the switch module. I haven't had any problems since I resoldered the
connections.