New Holland CX720 Repair Manual page 3683

E0137-04-Open Covers Switch Shorted to Low Source (K.60.B.05.80
- G.30.B.53)
E0137-04 - Open Covers Switch Shorted to Low Source
Cause:
The tank extensions switch (S-42) circuit is shorted to ground.
Possible failure modes:
1. Switch supply wiring shorted to ground.
2. Controller internal failure (internal regulator failure).
Solution:
1. Enter the InfoView monitor - "Diagnose info" screen.
Select "Clean Grain" sub menu.
Select "Open Covers switch" and check voltage range. Cycle the tank extensions switch between the On and
Off positions.
The normal operating range for the tank extensions switch in the "Off" position is 0.5 - 3.5 volts.
The normal operating range for the tank extensions switch in the "On" position is 3.5 - 5.0 volts.
NOTE : The tank extensions switch actually supplies 12 volts (battery voltage) to the module when in the On
position, however, the Diagnostic screen bar graph only displays to 5 volts.
A. If the voltage reading is low (0 - 0.5 volts) out of range, continue with step 2.
B. If the voltage reading is within the proper limits, continue the troubleshooting at step 5.
NOTE: Visually inspect the wiring harness and connectors. Verify that the connector was fully installed. Inspect
the terminals and wires at the connector for pushed back or corroded terminals or damaged wires. Flex the
harnesses involved to reveal intermittent breaks or shorts in the wiring concerned.
2. Check fuse F-49.
A. If fuse has failed, continue with step 3.
B. If fuse is okay, continue with step 4.
3. Replace fuse F-49.
A. If fuse immediately fails, there is a short to ground on one of the following wires in the cab main (CM) or
cab roof (CR) harnesses:
Wire 046 orange, fuse F-49 through connector X073 to seat switch S-05
Wire 045 orange, fuse F-49 through connector X002 pin A to cab roof harness splice
Wire 901 orange, harness splice to HVAC module connector X128 pin C2
Wire 240 orange, harness splice to rear work light switch connector X131 pin 2
Wire 172 orange, harness splice to beacon light switch connector X130 pin 2
Wire 124 orange, harness splice to tank extensions switch connector X125 pin 2
Locate the short to ground and repair.
B. If fuse is okay, continue with step 4.
4. Place the tank extensions switch in the ON position.
A. If fuse immediately fails, there is a short to ground in the cab main (CM) or cab roof (CR) harnesses
between the tank extensions switch connector X125 pin 3 through connector X002 pin N to connector
X015 pin J1-3 wire 167 yellow. Locate the short and repair.
B. If fuse is okay, continue with step 5.
5. Operate the machine while monitoring InfoView display. If no low out of range readings are indicated, erase the
fault code and continue operation.
CROP PROCESSING - STORING AND HANDLING Grain storing
2 4/7/2006
K.60.B / 49