349F and 352F Excavators Caterpillar

Window Wiper Delay - Test

Usage:

Machine ECM

The following is a list of Diagnostic Trouble Codes (DTCs) that are associated with the window wiper delay circuit of the machine.

Show/hide table

Table 1
Machine ECM (MID 299)
DTC	Code Description	System Response
287-3	Window Wiper Delay (6): Voltage Above Normal	The window wiper system will fail to function when requested.
287-6	Window Wiper Delay (6): Current Above Normal	The window wiper system will fail to function when requested.
288-3	Window Wiper Delay (3): Voltage Above Normal	The window wiper system will fail to function when requested.
288-6	Window Wiper Delay (3): Current Above Normal	The window wiper system will fail to function when requested.

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. If a problem with a connection is found, correct the problem and verify that the diagnostic code is active before performing a troubleshooting procedure.

Possible causes for an FMI 3 diagnostic code are:

The energize circuit is shorted to another voltage source.
The switch panel has failed.
The Machine ECM has failed. A failure of the Machine ECM is unlikely.

Possible causes for an FMI 6 diagnostic code are:

The energize circuit of the module is shorted to a ground source.
The control module has failed.
The switch panel has failed.
The Machine ECM has failed. A failure of the Machine ECM is unlikely.

Show/hide table




Illustration 1	g03420577
Schematic for the Window Wiper Control Module

Note: The diagram above is a simplified schematic of the wiper delay circuit connections. The schematic is electrically correct. However, not all of the possible harness connectors are shown. Refer to the latest revision of Electrical Schematic , UENR3640 for the complete schematic.

Diagnostic Trouble Code Procedure

Show/hide table

Table 2
Troubleshooting Test Steps	Values	Results
1. Identify The Active FMI Code Associated With The Wiper Circuit	Code present	FMI 3 diagnostic code, proceed to Test Step 2. FMI 6 diagnostic code, proceed to Test Step 3.
Begin Process For FMI 3 Troubleshooting HERE
2. Check The Machine Harness For A Short A. Turn the Key start switch and the 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 between 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 3. 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 5.
Begin Procedure For FMI 6 Troubleshooting HERE
3. Check The Control Module A. Turn the Key start switch and disconnect switch to the ON position. B. Disconnect the wiper module from the machine harness. C. At the machine harness for the wiper module, place a jumper wire between one of the intermittent wiper delay signals and ground.	The diagnostic code is no longer active.	OK - The diagnostic code is no longer active. Repair: The wiper module has failed. Repair or replace the wiper module. Proceed to Test Step 5. NOT OK - The diagnostic code remains active. Proceed to Test Step 4.
4. Check The Signal Circuit For A Short To Ground A. Key start switch and disconnect switch OFF. B. Remove the jumper wire that was installed in the previous Test Step. C. Disconnect all harness connections at switch panel. D. At switch panel harness connector measure resistance from signal contacts of wiper module to all possible sources of ground.	All readings are greater than 5K Ω.	OK - All resistance greater than 5K Ω. Proceed to Test Step 5. NOT OK - One or more readings less than 5 Ω. Repair: The short is between the signal contact and the circuit with the low resistance. Repair or replace the 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 5.
5. Check If The Diagnostic Code Remains. A. Clear all diagnostic codes. B. Key start switch and disconnect switch OFF. C. Perform a 45 N (10 lb) pull test on each of the wires that are associated with the sensor circuit. D. Reconnect all harness connectors. Make sure that the connectors are fully seated. Observe that the clips for each connector are fastened securely. E. Turn the disconnect switch and the key start switch to the ON position. F. Operate the machine. G. Check the status of the active diagnostic code.	Code is NO longer present.	OK - Diagnostic code does not exist at this time. Initial diagnostic code may have been caused by poor electrical connection or short at one of the harness connections. Resume machine operation. STOP. NOT OK - Diagnostic trouble code has not been corrected. Repair: If the diagnostic code has not been corrected after performing the above procedure, follow procedure for replacing the ECM. Prior to replacing the ECM, always contact the Technical Communicator at your dealership for possible consultation with Caterpillar. This consultation may effect repair time. Refer to Troubleshooting, "Electronic Control Module (ECM) - Replace" if the ECM needs to be replaced. STOP.