Selector Switch; Description; Operation - Dodge Dakota Sport 2001 Service Manual

AN

SELECTOR SWITCH

DESCRIPTION

The selector switch assembly (Fig. 89) is mounted
in the vehicle Instrument Panel (IP) and consists of a
rotary knob connected to a resistive network for the
mode and range shift selections. Also located in this
assembly is a recessed, normally open momentary
switch for making shifts into and out of transfer case
NEUTRAL. A pen, or similar instrument, is used to
make a NEUTRAL shift selection, thus reducing the
likelihood of an inadvertent shift request.
The selector switch also contains four light emit-
ting diode's (LED's) to indicate the transfer case posi-
tion and whether a shift is in progress.
Fig. 89 Selector Switch
1 - TRANSFER CASE MODE SELECTOR SWITCH

OPERATION

As the position of the selector switch varies, the resis-
tance between the Mode Sensor supply voltage pin and
the Mode Sensor output will vary. Hardware, software,
and calibrations within the Transfer Case Control Mod-
ule (TCCM) are provided that interpret the selector
switch resistance as given in the table below:
TRANSFER CASE - NV244
SELECTOR SWITCH INTERPRETATION
Step Resistance
Range (ohms)
A
B
C 1050-1450
D 1850-2300
E 3050-5950
F
G
For resistances between the ranges B-E shown for
each valid position (T-Case NEUTRAL, 4LO, 4HI,
2WD/AWD), the TCCM may interpret the resistance
as:
• either of the neighboring valid positions.
• as an invalid fault position.
For resistances between the ranges E and F shown
for AWD/2WD and in-between positions, the TCCM
may interpret the resistance as:
• the AWD/2WD position.
• an invalid fault position.
• a valid in-between position.
For resistances between the ranges F and G shown
for in-between positions and fault condition (open),
the TCCM may interpret the resistance as:
• a valid in-between position.
• an invalid fault position.
For resistances between the ranges A and B shown
for the fault condition (short) and , T-Case NEU-
TRAL, the TCCM may interpret the resistance as:
• the T-Case NEUTRAL position.
• an invalid fault position.
The LED's in the selector assembly are illuminat-
ed/flashed in the following manner to indicate a par-
ticular condition or state.
• A solidly illuminated LED indicates a success-
fully completed shift and the current operating mode
of the transfer case. While a shift has been requested
but not yet completed, the LED for the source trans-
fer case position remains solidly illuminated.
• A flashing operating mode LED for the desired
gear indicates that a shift to that position has been
requested, but all of the driver controllable conditions
have not been met. This is in an attempt to notify
the driver that the transmission needs to be put into
NEUTRAL, the vehicle speed is too great, or some
other condition outlined (other than a diagnostic fail-
ure that would prevent this shift) above is not met.
Note that this flashing will continue indefinitely
until the conditions are eventually met, or the selec-
Required
Interpretation
<200 Shorted
400-700 NEUTRAL
4LO
4H
2WD/AWD
(Default)
9.5-12.5K In between
positions
>15.5K Open
21 - 599