CYL GP- 4653485 - Caterpillar

Which Generate This Code:This diagnostic code is associated with the operation of the Auto/Manual remote switch. The switch is operating incorrectly. The possible causes are listed below:
The switch or the wiring harness has a short circuit.
The switch or the wiring harness has a open circuit.
The switch is not seen by the system.
The switch is "lost".System Response:"CB 21" is shown on the display.Test Step 1. CHECK THE REMOTE SWITCHCheck the remote push button or the toggle switches for a failure.
Check the wire harness and the wire connectors of the system. Ensure that the components are not shorted to ground or power.ReferenceRefer to Testing and Adjusting, "Wiring Harness (Short Circuit) - Test"
Check the wire harness and the wire connector of the system in order to ensure that there is not a open circuit.ReferenceRefer to Testing and Adjusting, "Wiring Harness (Open Circuit) - Test"
Check the wire connector of the remote switch assembly and make sure that the connection is tight.ReferenceRefer to Testing and Adjusting, "Electrical Connector - Inspect"
Check the wiring harness of the remote switch and make sure that the harness is not damaged.
Check in order to make sure that the remote switch is configured.
Use the "Test Control Box" menu in order to test that the switches in the system are functioning properly.Results:
OK - The switch now works.Repair: Return the machine to normal service. If the problem continues, contact your Caterpillar Dealership.STOP
NOT OK - The Switch does not function.Repair: Repair the affected Auto/Manual switch or replace the affected Auto/Manual switch.STOP