FITTING 5343561 - Caterpillar

The Window Washer Switch has one input to the switch panel. The input is normally open. When a circuit is measured with a voltmeter, an open circuit will measure approximately 8 VDC to ground. A closed circuit will measure approximately 0 VDC to ground.The diagnostic code is recorded when the status of both the inputs are open.Possible Causes for an FMI 3 Diagnostic code are:
The ground wire is open.
The signal is permanently open.
The signal is permanently closed.
The switch has failed.
The ECM has failed. A failure of the Machine ECM is unlikely.Possible Causes for an FMI 6 Diagnostic code are:
A short to ground.
The switch has failed.
The ECM has failed. A failure of the Machine ECM is unlikely.
Illustration 1 g03842872
Connections of the Window Washer Switch
Note: The diagram above is a simplified schematic of the Switch Panel connections. The schematic is electrically correct. However, not all the possible harness connectors are shown. Refer to the latest revision of Electrical Schematic, UENR5970 for 323D2 excavator electrical systems. Refer to the latest revision of Electrical Schematic, UENR5459 for 326D2 L or 330D2 L excavator electrical systems.Note: The following test procedure may create other diagnostic trouble codes. Ignore these created diagnostic trouble codes and clear the diagnostic trouble codes when the original diagnostic trouble code has been corrected.Note: The switch in this circuit is enclosed in a module. The switch for this circuit is not independently serviceable. The module must be replaced if the switch fails.Diagnostic Trouble Code Procedure
Note: Prior to beginning this procedure, inspect the harness connectors that are involved in this circuit. Poor connections can often be the cause of a problem in an electrical circuit. Verify that all connections in the circuit are clean, secure, and in good condition. Check the wiring for pinch points or abrasions. Look for and repair areas that indicate wires are exposed. If a problem with a connection is found, correct the problem and verify that this diagnostic code is active before performing a troubleshooting procedure.
Identify the active FMI code associated with the faulty component.
Determine which code is present and use the list below to determine the correct procedure to follow.
FMI 3 diagnostic code, proceed to Table 2.
FMI 6 diagnostic code, proceed to Table 3.
Table 2
Begin Process For FMI 3 Troubleshooting HERE
Troubleshooting Test Steps Values Results
1. Check The Ground Circuit For An Open
A. Turn the disconnect switch and the key start switch to the OFF position.
B. Disconnect the switch from the machine harness.
C. Measure the resistance between frame ground and the "washer" contact on the switch panel.
The reading is less than 5 Ω. OK - The resistance is less than 5 Ω.
Repair: Replace the module for the wiper control.
Proceed to Test Step 2.
NOT OK - The resistance is greater than 5K Ω.
Repair: The "washer" circuit wire is