The following is a list of Diagnostic Trouble Codes (DTCs) that are associated with the window washer switch of the machine.
| Machine ECM (MID 299) | ||
|---|---|---|
| DTC | Code Description | System Response |
| 2913-3 | Window Washer Switch : Voltage Above Normal | Switch will not function. |
| 2913-6 | Window Washer Switch : Current Above Normal | Switch will not function. |
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 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.
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| Illustration 1 | g03420641 |
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Connections of the Window Washer Switch | |
Note: The diagram above is a simplified schematic of the wiper control 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.
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.
| Troubleshooting Test Steps | Values | Results |
|---|---|---|
| 1. Identify Active FMI Code Associated With Sensor Circuit | Code present. |
FMI 3 diagnostic code, proceed to Test Step 2. FMI 6 diagnostic code, proceed to Test Step 4. |
| Begin Process For FMI 3 Troubleshooting HERE | ||
| 2. Check The Ground Circuit For An Open A. Turn the disconnect switch and the key start switch OFF. B. Disconnect the washer switch from the machine harness. C. Measure the resistance between frame ground and the "washer" contact on the switch panel. |
The resistance is greater than 5K Ω. |
OK - The resistance is greater than 5K Ω. Proceed to Test Step 3. NOT OK - The resistance is less than 5K Ω. The washer switch has failed. Repair: Replace the wiper control module. Proceed to Test Step 6. |
| 3. Check The Signal Circuits In The Harness For An Open A. The machine harness connectors remain disconnected from the "wiper control" module. B. At the machine harness connector for the "wiper control" module, check for continuity between "washer" contact and all sources of negative battery. C. Press the washer switch and release the switch. (Checking the switch for continuity.) |
The continuity check is correct. |
OK - The continuity check is correct. Proceed to Test Step 6. NOT OK - The continuity check is not correct. Repair: There is an open in the signal circuits of the machine harness. Repair or replace the machine harness. Proceed to Test Step 6. |
| Begin Process For FMI 6 Troubleshooting HERE | ||
| 4. Check the Ground Circuit Of The Switch In The Harness A. Turn key start switch and disconnect switch OFF. B. Disconnect the machine harness connectors from the switch panel. C. Measure the resistance between the "washer" connection on the switch panel and the ground contact. |
The resistance is less than 5 Ω. |
OK - The circuit is correct. Proceed to Test Step 5. NOT OK - The resistance is greater than 5K Ω. The circuit is open. Repair: 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 6. |
| 5. Check The Switch Circuits For A Short To The Ground Circuit A. The machine harness connectors remain disconnected from the switch panel. B. Turn the disconnect switch and the key start switch OFF. C. Disconnect the machine harness connector from the "wiper control" module. D. At the switch panel harness connector, measure the resistance between the "washer" contact and all contacts used in the switch panel harness. |
Each reading is greater than 5K Ω. |
OK - The wiring harness is correct. Repair: Replace the "wiper control" module. Proceed to Test Step 6. NOT OK - One or more of the measurements were less than 5 Ω. A short exists in the wiring harness. Repair: 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 6. |
| 6. Check If The Diagnostic Code Remains A. Inspect the harness connectors and clean the contacts of the harness connectors. B. Reconnect all harness connectors. C. Turn key start switch and disconnect switch ON. D. Operate the machine. E. Check the status of the diagnostic code. |
The diagnostic code is not active. |
OK - The diagnostic code is no longer active. The problem may be intermittent. Resume normal machine operation. STOP. NOT OK - The diagnostic code is active. The ECM may have failed. Repair: A failure of the ECM is unlikely. If the cause of the diagnostic code is not found, replace the ECM. Prior to replacing an ECM, always contact your dealer for possible consultation with Caterpillar. This consultation may effect repair time. If the ECM must be replaced, refer to Troubleshooting, "ECM - Replace". STOP. |