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.
13.
TEST OPTIONS
KNOWN INFO
Error Codes, EC11 and
Is there continuity
Continuity Tests.
EC12
measured at the main
REASON FOR QUESTION
Worklight bulb OK.
frame worklight har-
Both worklight and
ness?
If there is no continuity
spotlight are inoperative.
at the designated
Worklight switch OK.
positions on the
Wire no. 40 OK.
worklight wiring harness,
Cab interface wiring
the 24 volt power from
harness OK.
the digital controller does
Main wiring harness OK.
not reach the main frame
worklight.
POSSIBLE PROBLEMS
Digital control box faulty.
Worklight harness faulty.
Repair or replace
main frame worklight
assembly (includes
NO
main frame worklight
wiring harness) (para
YES
If all previous
tests were
completed with a
satifactory result,
replace digital
control box (para
4-100
4-94.6
Change 1
