Validation andTroubleshooting C
C.7 Checking the lightbars and control box
When you power up the system, observe the start-up sequence of the lightbars and
the control box to make sure that they function correctly.
For more information, refer to the GCS900 Grade Control System for Excavators
Operator's Manual.
C.8 No power
Where there appears to be no power present on the system, check that:
l power is connected correctly; use a multimeter to trace the voltage from the
source through all the components of the system
l all fuses are working
l all the pinouts are connected correctly
If you suspect that a component is faulty, swap in a known good component and
then re-check the machine power.
If the control box does not power up:
1. Remove the main harness connector from the rear of the control box.
2. On the power circuit between the battery and the control box, check the:
connections to battery positive and chassis ground. Tighten any loose
connections, and re-check the control box.
fuses on the switched and/ or unswitched positive power flying leads.
Replace any blown fuses, and re-check the control box.
power cables and connectors between the battery and the control box.
3. Measure the power voltage on the battery/machine side of each connector in
the unswitched power circuit.
If power is not present at a connector, suspect a failed cable. Swap in a known
good cable.
4. Ensure that battery voltage is present at pins D and F on the control box
connector.
For more information, see the following diagram.
GCS900 Grade Control System for Excavators Installation Manual 167
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