New Holland T8010 Manual page 1627

Hitch UP/DOWN Switch Failure
Cause:
Hitch up/down switch failure.
Possible failure modes:
1. The operator has been holding the switch between Up/Down positions for more than 2 seconds.
2. Switch failed.
3. External wiring failure (damaged wires, loose connectors, or bent pins).
4. Armrest controller internal failure (power supply or signal sensing failed).
Solution:
The ARMREST controller monitors the switch positions. The switch should stay in either up, down or fast drop
position. If the switch is not in contact with either position or is in contact with two or more positions at the same
time, the controller will record the fault code.
NOTE: When the tractor reaches the end of a row, some operator tends to press or hold the switch before really
putting it into position. This may cause the switch not in contact with either the up, down or fast drop position. If this
situation lasts for more than two seconds, the controller will record the fault code and the instrument cluster will
flash 'ARM Fault'. For safety reasons, the hitch will be disabled. The operator has to cycle the key switch and
recapture the hitch to make the system function again. If this is not the case, do the following:
Monitor the switch status on the monitor screen of the service tool. Test the switch function, its wiring, and the
function of the armrest controller.
1. Open the armrest controller housing and disconnect connector J210 for HITCH UP/DOWN control.
2. Test the HITCH UP/DOWN switch and its wiring. Pay attention for wiring damage, loose connectors, or bent
pins.
a. When the switch is in UP position, there should be continuity between J210 pin 4 and pin 2. No continuity
between other pins.
b. When the switch is in DOWN position, there should be continuity between J210 pin 1 and pin 2. No continuity
between other pins.
c. When the switch is in DOWN FAST position, there should be continuity between J210 pin 2 and pin 3. No
continuity between other pins.
If the switch is not functioning as specified above, replace the switch.
3. Check controller function:
a. Measure the voltage output from the controller at pin 2 of J210. It should be at 12 VDC.
b. Short wire pin 2 to pin 1 to simulate the DOWN function. Short wire pin 2 to pin 3 to simulate the DOWN
FAST function. The switch normal position is the UP position.
Monitor the switch status on the monitor screen of the service tool.
If the controller does not function properly, replace the armrest controller.
NOTE: See schematic section 46 on schematic poster.
Section 55 - Electrical System, Controller - Chapter 5
FAULT CODE ARM 1049
55-5-22