ALTERNATOR GP 1477152 - Caterpillar

diagnostic code is recorded when the VIMS main module determines that there is an open circuit in the display back light return circuit.
CHECK FOR OPEN BACKLIGHT BULBS.
Check for open backlight bulbs in the message center and the bottom portion of the speedometer/tachometer module.Expected results:Bulbs are good.Results:
OK - Bulbs are good. Proceed to Step 2.
NOT OK - Bulbs are open. Replace the open bulbs.
CHECK FOR OPEN HARNESS
Turn the key start switch and the disconnect switch to OFF position.
Disconnect the VIMS main module and the message center back light from the machine harness.
Measure the resistance of the display back light return circuit from the VIMS main module connector (contact 3) to the message center back light bulb socket (wire E710-BU). Expected results:There is continuity (less than 5 ohms).Results:
OK - Circuit has continuity. The display back light return circuit in the machine harness is correct. The VIMS main module has failed. Replace the VIMS module. Refer to the Testing and Adjusting, "Module-Replace" section. STOP.
NOT OK - Circuit has NO continuity. The machine harness has failed. The display back light return circuit is open in the machine harness. Repair the machine harness or replace the machine harness. STOP.