HOSE 1533638 - Caterpillar

Illustration 1 g01352519
Connections of the seat switch
The seat switch has two inputs to the ECM. The two inputs are normally open and normally closed. During normal operation, one of the inputs is open. The other input is grounded. When a circuit is measured with a voltmeter, an open circuit will measure approximately 13 DCV to ground and a closed circuit will measure approximately 0 DCV to ground. The FMI 03 is recorded when the status of both of the inputs are open.The possible causes of this diagnostic code are listed below:
The return circuit (wire J764-BR(Brown)) is open.
Switch contact "C" (wire U767-BU(Blue)) is permanently open.
Switch contact "B" (wire U766-BR(Brown)) is permanently open.
The switch has failed.
The ECM has failed. This is unlikely. Before performing this procedure, inspect the harness connectors that are involved in the circuit. Poor connections can often be the cause of a problem in an electrical circuit. Verify that all of the connections in the circuit are clean and secure. If a problem with a connection is found, correct the problem and verify that this diagnostic code is active before performing this procedure.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 diagnostic code of CID 2113 FMI 03 is active before performing this procedure.
Table 1
Switch Status
MODE Switch Position J2-30
wire U766-BR(Brown) J2-31
wire U767-BU(Blue)
Released Up Open Closed
Pressed Down Closed Open System Response:A level 2 warning will be generated. The action lamp will be ON and flashing.Test Step 1. CHECK THE GROUND CIRCUIT FOR AN OPEN
Turn the disconnect switch and the keyswitch to the OFF position.
Disconnect the machine harness connectors from the ECM.
Disconnect the switch from the machine harness.
Measure the resistance between contact J1-56 and contact A (wire J764-BR(Brown)) at the connector for the switch. Expected Result:The resistance should be less than 5 ohms.Results:
OK - The resistance is less than 5 ohms. Proceed to Test Step 2.
NOT OK - The resistance is greater than 5 ohms.Repair: The return circuit (wire J764-BR(Brown)) is open in the machine harness. Repair the machine harness or replace the machine harness.STOPTest Step 2. CHECK THE SWITCH
Check for continuity between contact A and contact B of the switch.
Press the switch. Release the switch and check for continuity.
Check for continuity between contact A and contact C of the switch.
Press the switch. Release the switch and check for continuity. Expected Result:The continuity check agrees with the Table 1.Results:
OK - The continuity check agrees. Proceed to Test Step 3.
NOT OK - The continuity check does not agree. The switch has failed.Repair: Replace the switch. Verify that the new switch corrects the diagnostic code.STOPTest Step 3. CHECK THE SIGNAL CIRCUITS FOR AN OPEN
Reconnect the switch to the machine harness.
The machine harness connectors remain disconnected from the ECM.
At the machine harness connector for the