New Holland CX720 Repair Manual page 1360

E0010-04-Rear Work Lights Switch Shorted To Low Source
(A.40.A.17.83 - G.30.B.53)
E0010-04 - Rear Work Lights Switch Shorted To Low Source
Cause:
The rear work lights switch (S-44) circuit is shorted to ground.
Possible failure modes:
1. Switch or CCM1 supply wiring shorted to ground.
2. Controller internal failure (internal regulator failure).
Solution:
1. Enter the InfoView Monitor - "Diagnose info" screen.
Select "Electrical" sub menu.
Select "Rear Work Lights switch" and check voltage range.
The normal operating range for the rear work lights switch - ON 4.0 - 5.0 volts
The normal operating range for the rear work lights switch - OFF 0.5 - 4.0 volts
NOTE: Check fuse F-49. If a short to ground occurred on this circuit the fuse will have blown.
A. If the voltage reading is 0 - 0.5 volts in either switch position continue with Step 2.
B. If the voltage reading is 0.5 - 4.0 volts with the switch OFF and 0 - 0.5 volts with the switch ON. Continue
with Step 3.
2. The voltage reading on the InfoView display is 0 - 0.5 volts. The short to ground is somewhere between the
switch and CCM1. Disconnect the cab main harness from the cab roof harness at connector X002.
A. If the voltage increases to 0.5 - 4.0 volts, the short is between connector X002 and the switch, cab roof
harness wire 170 yellow. Locate and repair the short.
B. If the voltage remains low on InfoView display the short is between connector X002 and connector X018
J1-15 CCM1, cab main harness wire 170 yellow.
3. The voltage reading is 0.5 - 4.0 volts with the switch OFF and 0 - 0.5 volts with the switch ON. The short to
ground is between the fuse and switch. Disconnect the cab main harness from the cab roof harness at connector
X002. Operate the switch again and observe InfoView display.
A. If the voltage reading is 0.5 - 4.0 volts with the switch OFF and 0 - 0.5 volts with the switch ON. The short
is between connector X002 and the switch, in the cab roof harness wire 239 or 045 orange. Locate and
repair the short.
B. If the voltage reading remains between 0.5 - 4.0 volts the short is between connector X002 and fuse F-49,
in cab main harness wire 045 orange.
Series 1206 and above
Wiring harness - Electrical schematic frame 42 (A.30.A.88-C.20.E.42)
DISTRIBUTION SYSTEMS - LIGHTING SYSTEM
2 4/7/2006
A.40.A / 44