CHANNEL ASSEM. 8D1129 - Caterpillar

Table 3
Troubleshooting Test Steps Values Results
1. Identify The Active FMI Code Associated With The Sensor Circuit Code Present FMI 2 diagnostic code, proceed to Test Step 2.
FMI 3 diagnostic code, proceed to Test Step 6.
FMI 4 diagnostic code, proceed to Test Step 9.
Begin Process For FMI 2 Troubleshooting Here
2. Check The Sensor
A. Turn the disconnect switch and the key start switch to the ON position.
B. Ensure that the diagnostic code is active.
C. Observe the status of the diagnostic code. Disconnect pin "2" connector from the machine harness for the seat.
The FMI 2 remains active. OK - The FMI 2 remains active. The code has not changed. The sensor is correct.
Proceed to Test Step 3.
NOT OK - The diagnostic code is no longer active. The sensor has failed.
Repair: Repair the sensor.
Proceed to Test Step 11.
3. Check The Mount Of The Sensor In The Seat
Note: A proper mount for the sensor is critical for correct operation of the sensor.
A. Turn the key start switch and the disconnect switch to the OFF position.
B. At the sensor, check the condition of the seat. The sensor must be mounted properly and the connector must be secure.
The seat is in good condition and the connector for the sensor is secure. OK - The seat is in good condition and the connector for the sensor is secure. There does not appear to be a problem with the sensor or the seat.
Proceed to Test Step 4.
NOT OK - The seat is in poor condition and the connector for the sensor is loose.
Repair: Replace the seat.
Proceed to Test Step 11.
4. Check The Circuit For An Open
A. Verify that the key switch and the disconnect switch remain in the OFF position.
B. Disconnect the machine harness connector from the sensor.
C. Disconnect the J1 machine harness connector from the ECM.
D. At the machine harness connector for the seat, connect a jumper wire between contact "1" and contact "2".
E. At the machine harness connectors for the ECM, measure the resistance between signal and return.
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