132
Drive Select Switch
RESISTANCE
1. Remove the switch assembly from the dash; then dis-
connect the harness from the switch.
NOTE: The switch can be removed from the dash
using a thin, flat pry bar or suitable putty knife. It is
not necessary to remove the dash to remove the
switch.
2. Using an ohmmeter, the following readings must be
observed.
PR566A
VOLTAGE
NOTE: Voltage tests must be made with the switch
and the actuator connected. The meter can be con-
nected at the actuator connector using a break-out
harness or needle adapters.
1. Connect the black tester lead to the black wire; then
turn the ignition switch to the ON position.
2. Select the DC Volts position on the tester and
observe the meter readings for each of the three
switch positions.
NOTE: If the meter does not show voltages accord-
ing to the chart, make sure the front drive actuator is
plugged in; then troubleshoot the switch, ignition
fuses, battery connections, or wiring harness.
Reverse Override Switch
VOLTAGE
NOTE: To perform the following tests, the ignition
switch must be in the ON position and the transmis-
sion shifted into reverse gear.
1. Connect the red meter lead to the black/blue wire and
the black meter lead to a suitable ground; then select
2WD on the drive select switch. The meter must
show approximately 1.5 DC volts.
2. Depress the reverse override switch. The meter
showing should not change from step 1.
3. Select 4WD on the drive select switch. The meter
must show approximately 5 DC volts.
4. Depress the reverse override switch. The meter must
show approximately 1.5 DC volts.
5. Connect the red meter lead to the red/yellow wire.
The meter must show approximately 1.5 DC volts.
Depress the reverse override switch. The meter must
show approximately 1.5 DC volts.
6. Connect the red meter lead to the red/green wire. The
meter should show 0 DC volts.
7. Depress the reverse override switch. The meter must
show approximately 5 DC volts.
Front Drive Actuator
NOTE: With the engine stopped and the ignition
switch in the ON position, a momentary “whirring”
sound must be noticeable each time the drive select
switch is moved to 2WD and 4WD. Test the switch, 30
amp fuse , and wiring connections prior to testing the
actuator.
VOLTAGE
1. Locate the 4-wire connector for the front drive selec-
tor actuator on the frame to the right of the differen-
tial; then connect the red meter lead to the orange
wire using needle adapters.
Component data can be retrieved using the CATT II. Uti-
lize the Sensor Data screen.
2WD 4WD DIFFERENTIAL LOCK
AtoD<1ohm AtoD<1ohm AtoD<1ohm
CtoE<1ohm CtoE<1ohm CtoE<1ohm
A to B Open A to B <1 ohm A to B <1 ohm
A to C Open A to C Open A to C <1 ohm
A to E Open A to B <1 ohm A to C <1 ohm
WIRE COLOR 2WD 4WD DIFFERENTIAL LOCK
Black to Orange 12.0 DC Volts 12.0 DC Volts 12.0 DC Volts
Black to White/
Green
11.5 DC Volts 0 DC Volts 0 DC Volts
Black to White/
Red
11.5 DC Volts 11.5 DC Volts 0 DC Volts
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