HOUSING GP-FRONT 3223144 - Caterpillar

(Action Alarm - Voltage Above Normal)
Illustration 1 g02276434
Schematic of the action alarm.
This diagnostic code is associated with the action alarm. The FMI 03 means that the Messenger module has determined that the voltage of the alarm circuit is above normal.The possible causes of the diagnostic code are listed below:
The action alarm has failed.
The energize circuit of the alarm is shorted to the +Battery circuit.
The dash cluster has failed. This cause is unlikely.Note: The following test procedure may create other diagnostic codes. Ignore these created diagnostic codes and clear these diagnostic codes when the original diagnostic code has been corrected. Ensure that the CID 271 FMI 3 diagnostic code is active before performing this procedure.Note: Use the 146-4080 Digital Multimeter for the measurements in this procedure.Test Step 1. CHECK THE ALARM
Disconnect the harness connector from the action alarm.
Use jumpers to connect the respective terminals of the alarm to +Battery and ground. Expected Result:The action alarm sounds when power is applied.Results:
OK - The alarm sounds when power is applied. The alarm functions properly. Proceed to Test Step 2.
NOT OK - The alarm does NOT sound. The alarm has failed.Repair: Repeat this Test Step "Check the Alarm" to verify the failure of the alarm. Replace the alarm. Verify that the new alarm corrects the problem.STOPTest Step 2. CHECK THE ENERGIZE CIRCUIT OF THE ALARM FOR A SHORT TO THE +BATTERY CIRCUIT
Turn the key start switch and the disconnect switch to the OFF position.
The machine harness connector remains disconnected from the alarm. Disconnect the machine harness from the dash cluster.
At the machine harness connector for the display module, measure the resistance from contact IC-23 (wire H414-YL(Yellow)) to all contacts that are used in the machine harness connectors for the dash cluster. Expected Result:Each resistance measurement is greater than 5000 ohms.Results:
OK - Each resistance measurement is greater than 5000 ohms. The machine harness is correct. Proceed to Test Step 3.
NOT OK - Each resistance measurement is not greater than 5000 ohms. There is a short in the machine harness for the dash cluster. The short is between IC-23 (H414-YL(Yellow)) and the circuit that has a low resistance measurement.Repair: Repair or replace the machine harness.STOPTest Step 3. CHECK THE HARNESS CONNECTORS
Inspect and clean the harness connector contacts.
Reconnect all harness connectors.
Turn the disconnect switch and the key start switch to the ON position.
Operate the machine.
Determine if the CID 271 FMI 3 is active. Expected Result:The CID 0271 FMI 03 is active.Results:
YES - The CID 271 FMI 3 is active. The problem has not been corrected. The dash cluster may have failed.Repair: Failure of the dash cluster is unlikely. Perform this procedure again. If the cause of the diagnostic code is not found, replace the dash cluster. STOP
NO - The CID 271 FMI 3 is not active. The problem does not exist at this time.Repair: The initial diagnostic code was probably caused by a poor electrical connection or a short at one of the harness connectors that was disconnected and reconnected. Resume normal machine operation.STOP