TM 5-5420-234-14&P
4-12. UNIT TROUBLESHOOTING (continued).
5.
HAND-HELD SPOTLIGHT 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.
11.
TEST OPTIONS
KNOWN INFO
Error Codes, EC11
Is there continuity
Continuity Tests.
Spotlight bulb OK.
measured between the
REASON FOR QUESTION
Worklight switch OK.
main wiring harness
Wire no. 40 OK..
(J3) , (J4) and the
If there is no continuity
Cab interface wiring
hand-held spotlight
at the designated
harness OK.
harness (P12)?
positions on the main
wiring harness, the 24
POSSIBLE PROBLEMS
volt power from the
worklight switch does not
Digital controller wiring
reach the digital control
harness faulty.
box.
Digital control box
faulty.
Repair or replace
Digital controller
NO
wiring harness
YES
4-112.4
Change 1
6
