SWITCH AS 3702574 - Caterpillar

Diagnostic Trouble Code Procedure
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. If a problem with a connection is found, correct the problem and verify that the diagnostic code is active before performing a troubleshooting procedure.
Identify the active FMI code associated with the components.
Determine which code is present and use the list below to determine which procedure to follow.
FMI 3 diagnostic code, proceed to Table 2.
FMI 6 diagnostic code, proceed to Table 2.
Table 2
FMI 3 Troubleshooting
1. Check The Energize Circuit Of The Wiper Control For A Short
A. Key start switch and disconnect switch OFF.
B. Disconnect all harness connectors from the switch panel.
C. Disconnect the wiper control module from the machine harness.
D. At the switch panel, identify the wiper intermittent pin locations (refer to the schematic above).
E. Measure the resistance from the wiper intermittent connectors on the switch panel and all other contacts of the switch panel.
Each reading is greater than 5K Ω. OK - All measurements are greater than 5K Ω.
Proceed to Test Step 2.
NOT OK - Resistance is less than 5 Ω, a short exists in signal circuit.
Repair: Repair or replace machine harness.
Note: A resistance that is greater than 5 Ω but less than 5K Ω would indicate a loose connection or a corroded connection in the circuit. A resistance measurement that is greater than 5K Ω would indicate an open in the circuit.
Proceed to Test Step 3.
2. Check The Operation Of The ECM
Note: The disconnect and the key start switch remain in the OFF position. The machine harness connectors for the wiper module and the switch panel remain disconnected.
A. At the machine harness connector C7 for the switch panel, use a 151-6320 Removal Tool to remove signal wire and socket.
B. Reconnect the machine harness C6, C7, and C8 connectors to the switch panel.
C. Turn the disconnect switch and the key start switch to the ON position.
D. Observe the status of the active diagnostic code.
The diagnostic code is no longer active. An FMI 05 diagnostic code is now active. OK - The diagnostic code is no longer active. An FMI 05 code is now active for this DTC, after the energize circuit of the module is disconnected. The ECM has responded correctly to the open circuit condition in the circuit.
Reinstall the energize wire for the relay into the correct space in the connector of the switch panel.
Proceed to Test Step 6.
NOT OK - The diagnostic code remains active. The ECM has not responded correctly to the open condition of the wiper control circuit. The operation of the ECM is not correct.
Repair: Ensure that you have the latest version of software for your specific machine and ECM. Refer to the Troubleshooting, "ECM Software - Install" section of this manual for the correct procedure.
After install is complete, turn the disconnect switch to the ON