4 X 2 Gear Selector
28
5.31. The differential lock works independently of the
gear selector, and is not controlled by the ESM.
It responds directly to the yellow button to the left
of the steering wheel. See Figure 5.31.
NOTE: The differential lock button is a back-lit
momentary contact switch. When the differential
lock is engaged, the button will light-up. The dif-
ferential lock will stay engaged, and the button
will stay lit until the button is pushed a second
time to disengage the differential lock.
6. GEAR SELECTOR ELECTRICAL SYSTEM
DIAGNOSIS.
6.1. Any time a computer controlled circuit is being
checked, a high impedance circuit tester
should be used. A conventional circuit tester
simply places a light bulb in series with a ground
path from the circuit being tested. The draw
placed on the circuit by a conventional circuit
tester can damage computer circuitry such as
that used in the ESM. High impedance circuit
testers do not pass the full line current to ground,
but do pass a small portion of the line current to
ground, sense the presence of current, and light
a small LED indicator. High impedance circuit
testers are commonly available at a reasonable
price. See Figure 6.1.
NOTE: Back-probing is the best technique for
finding power at molded connections. Clip the
end of the tester lead to a good ground, and
probe the connector with the end of the tester.
6.2. If there are no signs of life in the gear selector
electrical system, check the fuse as described in
the “BASIC CHECKS” section of this manual.
NOTE: If the fuse is blown, inspect the rest of
the gear selector wiring harness to find the
source of the short that caused the blown fuse.
Figure 5.31
Differential
lock button
Figure 6.1
High impedance
circuit tester
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