New Holland CX720 Repair Manual page 1357

E0070-11-Front Work Lights Relay Unidentified Failure Code
(A.40.A.16.82 - G.30.B.46)
E0070-11 - Front Work Lights Relay Unidentified Failure Code
Cause:
The front work lights relay(s) (K-01, K-21, K-22 or K-30) circuit is open, or shorted to ground.
Possible failure modes:
1. Supply wiring damaged.
2. Bad relay(s).
3. Controller internal failure (internal regulator failure).
Solution:
1. Several relays are used to control the numerous work lights installed on the combine, but all of the relays are
engaged using a single output signal from CCM1. Since the relays are wired in parallel, it is possible to have
a single relay fail, preventing certain lighting from coming on, without having a fault code indicated. This fault
code will only occur if there is a short to ground anywhere on the supply wiring to the relays, or if there is an
open circuit between the CCM1 module and the first relay (K-01). An open circuit on one of the relay ground
paths, or in the supply wiring to the K-21, K-22, or K-30 relays will not cause this error to be displayed
Enter the InfoView monitor - "Diagnose info" screen.
Select "Electrical" sub menu.
Select "Front Work Lights relay" and select the "Status" screen. Press the "Enter" key to manually power the
circuit.
The status screen should indicate "OK" if the circuit is working properly.
A. If the status screen indicates "Error", the circuit is open or shorted to ground. Continue with Step 2.
B. If the status screen indicates "OK", the circuit is working properly. Continue with step 4.
2. Key OFF. Remove the Cab Roof Work Lights relay K-01, and use a multimeter to check between relay base pin
1 and chassis ground.
A. If there is not continuity to ground, continue with step 3.
B. If there is continuity to ground, there is a short to ground in the cab main (CM) harness between connector
X018 pin J1-11 and the work lights relays on one of the following wires:
Wire 190 white, connector X018 pin J1-11 to relay K-01 pin 1
Wire 189 white, relay K-01 pin 1 to relay K-21 pin 1
Wire 188 white, relay K-21 pin 1 to relay K-22 pin 1 (Series 1206 - 1281)
Wire 187 white, relay K-22 pin 1 to relay K-30 pin 1 (Series 1206 - 1281)
Locate the short and repair.
3. Key OFF. Remove the Cab Roof Work Lights relay K-01. Use the InfoView monitor - "Diagnose info" screen to
manually power the front work lights relays. Use a multimeter to check for 12 V power between relay base pin
1 and chassis ground.
A. If 12 V is not present, there is an open circuit in the cab main (CM) harness between connector X018 pin
J1-11 and relay base (K-01) pin 1 wire 190 white. Locate the open and repair.
B. If 12 V is present, continue with step 4.
4. Erase the fault code and continue operation.
A.
Series 1206 and above
Wiring harness - Electrical schematic frame 40 (A.30.A.88-C.20.E.40)
Series 1206 and above
Wiring harness - Electrical schematic frame 41 (A.30.A.88-C.20.E.41)
DISTRIBUTION SYSTEMS - LIGHTING SYSTEM
2 4/7/2006
A.40.A / 41