AccuGrade GPS / Single UTS / Site and Laser Reference v11 for Excavators Electrical Power Supply (Light Bar) Caterpillar


Electrical Power Supply (Light Bar)
`

System Operation Description:

The light bars are not receiving power.

The probable conditions that cause this symptom are in the following list:

  • The light bar brightness is set to 0

  • The display is not turned on

  • Damaged harness or connector

  • Failed light bar

Test Step 1. VERIFY THE BRIGHTNESS SETTING OF THE LIGHT BAR.

  1. Select "Display and Light Bar Brightness" in the "Configuration" menu.

  1. Ensure that the "Display and Light Bar Brightness" is not set to 0. If the setting is 0, set it to a higher number until the light bars illuminate.

  1. Verify that the display will power up.

  1. Ensure the battery disconnect switch and the key start switch are in the ON position.

  1. Turn the Display ON.

Expected Result:

The Display turns ON.

Results:

  • OK - The Display turns ON. Proceed to Test Step 2.

  • NOT OK - The Display does not turn ON.

    Repair: Perform the "Display Does Not Turn On" procedure.

    STOP

Test Step 2. VERIFY THE LIGHT BARS POWER UP.

  1. Check if the light bars are illuminated.

Expected Result:

All three of the light bars are illuminated.

Results:

  • OK - The light bars are illuminated.

    Repair: The problem was caused by the Display being turned off. Return the machine to service.

    STOP

  • NOT OK - One or more of the light bars do not power ON. Proceed to Test Step 3.

Test Step 3. CHECK THE POWER TO THE LIGHT BARS.

  1. Disconnect the harness connector from light bar connectors.

  1. Measure the voltage between pin 1 and pin 2 of all three connectors for the light bar.

Expected Result:

The measured voltage is approximately machine voltage at each machine harness connector for each light bar.

Results:

  • OK - The measured voltage is approximately machine voltage at each machine harness connector for each light bar. The light bar(s) that did not illuminate have failed.

    Repair: Replace the failed light bar(s).

    STOP

  • NOT OK - The voltage is not approximately machine voltage at each machine harness connector for each light bar. Proceed to Test Step 4.

Test Step 4. CHECK FUSE OR CIRCUIT BREAKER.

  1. Check the fuse or circuit breaker.

    Note: Use the machine schematic in order to identify the correct fuse or circuit breaker.

Expected Result:

The fuse or circuit breaker is "OK".

Results:

  • OK - The fuse or the circuit breaker is OK. Proceed to Test Step 5.

  • NOT OK - The fuse or circuit breaker have failed.

    Repair: Replace the fuse or circuit breaker.

    STOP

Test Step 5. CHECK FOR A SHORTED POWER CIRCUIT IN THE HARNESS.

  1. Check the harness for a short circuit condition.

    Note: Use the machine schematic to identify the power circuit wiring.

Expected Result:

There is no short circuit condition present in the harness.

Results:

  • OK - There is no short circuit condition present in the harness. Proceed to Test Step 6.

  • NOT OK - There is a short circuit condition present in the harness.

    Repair: Repair or replace the harness.

    STOP

Test Step 6. CHECK FOR AN OPEN POWER CIRCUIT IN THE HARNESS.

  1. Check the harness for a open circuit condition.

    Note: Use the machine schematic to identify the power circuit wiring.

Expected Result:

There is no open circuit condition present in the harness.

Results:

  • OK - There is no open circuit condition present in the harness. Proceed to Test Step 7.

  • NOT OK - Repair the harness or replace the harness.STOP

Test Step 7. CHECK THE LIGHT BARS.

  1. Reconnect the three light bars.

  1. Turn the disconnect switch and the key start switch to the ON position.

  1. Verify that the three light bars are illuminated.

Expected Result:

The three light bars are illuminated.

Results:

  • OK - The three light bars are illuminated.

    Repair: A poor electrical connection or a short at one of the harness connectors that was disconnected and reconnected probably caused the initial problem with the light bars. Resume normal machine operation.

    STOP

  • NOT OK - One or more of the light bars are not illuminated.

    Repair: Repeat this procedure.

    STOP

Information System:

C13, C15, and C18 Tier 4 Interim Engines ARD Nozzle - Test
D7E Track-Type Tractor Power Train Idler - Remove and Install
C4.4 Industrial Engine Battery - Replace
C9.3 Engines for Caterpillar Built Machines Diagnostic Capabilities
3408E and 3412E Engines for Caterpillar Built Machines Inlet Air Temperature Is High
C13 Engine for Caterpillar Built Machines Cylinder Head - Remove and Install
D6N Track-Type Tractor Power Train Brake Pressure - Test
2009/04/13 Reworked Air Compressors Now Have "R" on the Serial Number Plate {1803, 1804}
C15 and C18 Industrial Engines Diesel Particulate Filter - Remove and Install - Clean Emissions Module
TS180 and TS220 Towed Scrapers Wheel - Install
TS180 and TS220 Towed Scrapers Wheel - Remove
3408E and 3412E Engines for Caterpillar Built Machines Coolant Flow - Test
AccuGrade<SUP>&reg; GPS / Single UTS / Site and Laser Reference v11 for Excavators Electrical Power Supply (GPS Receiver)
AccuGrade<SUP>&reg; GPS / Single UTS / Site and Laser Reference v11 for Excavators Electrical Power Supply (Data Radio)
AccuGrade<SUP>&reg; GPS / Single UTS / Site and Laser Reference v11 for Excavators Electrical Power Supply (Angle Sensor)
AccuGrade GPS / Single UTS / Site and Laser Reference v11 for Excavators CAN Data Link - Test
AccuGrade GPS / Single UTS / Site and Laser Reference v11 for Excavators Light Bar - Configure
AccuGrade GPS / Single UTS / Site and Laser Reference v11 for Excavators Machine Dimensions - Configure
AccuGrade GPS / Single UTS / Site and Laser Reference v11 for Excavators Machine Type - Configure
AccuGrade GPS / Single UTS / Site and Laser Reference v11 for Excavators Electrical Connector - Inspect
AccuGrade GPS / Single UTS / Site and Laser Reference v11 for Excavators Connector Contact Description
D5R Track-Type Tractor MID 039 - CID 3187 - FMI 03
D5R Track-Type Tractor MID 039 - CID 3187 - FMI 04
D5R Track-Type Tractor MID 039 - CID 3188 - FMI 03