TM 5-5420-234-14&P
4-12. UNIT TROUBLESHOOTING (continued).
4.
MAIN FRAME WORKLIGHT DOES NOT OPERATE (MODEL B ONLY) (continued).
NOTE
The digital controller and the cab control box are not repairable,
therefore, it is necessary to test the digital controller and cab
interface wiring harnesses, switches, solenoids, and other com-
ponents to identify possible faults other than the digital controller
and the digital cab controller.
12.
TEST OPTIONS
KNOWN INFO
Error Codes, EC11 and
Is there continuity
Continuity Tests.
EC12
measured between the
REASON FOR QUESTION
Worklight bulb OK.
digital control wiring
Both worklight and
harness (J3) , (J4) and
If there is no continuity
spotlight are inoperative.
the main frame
at the designated
Worklight switch OK.
worklight harness
positions on the main
Wire no. 40 OK.
(J11)?
wiring harness, the 24
Cab interface wiring
volt power from the
harness OK.
worklight switch does not
reach the digital control
POSSIBLE PROBLEMS
box.
Digital controller wiring
harness faulty.
Digital control box faulty.
Worklight harness faulty.
Repair or replace
Digital controller
NO
wiring harness
YES
4-94.4
Change 1
8
