5130, 5130B and 5230 Excavators, 784B, 785B, 785C, 789B, 789C, 793B and 793C Off-Highway Truck/Tractors and 992G, 994 and 994D Wheel Loaders Vital Information Management System (VIMS) Caterpillar

Illustration 1	g00730048
Schematic of the Payload Lamps

This diagnostic code is recorded when the VIMS module reads the current of the payload lamp and the current is below normal. The circuit is open. When this failure is present the red payload lamps do not light.

1. CHECK THE LAMP.

   1. At the red payload lamp, use a jumper to connect wire 636-BU(Blue) to frame ground.

      Expected Result: The diagnostic code CID 0824 FMI 05 is active.

      Results:

      • OK - The diagnostic code CID 0824 FMI 05 is still active. The red payload lamps are not causing the failure. Proceed to 2.

      • NOT OK - The diagnostic code CID 0824 FMI 05 is NO longer active. The lamp or the lamp socket is open. Replace the payload lamp. For the purposes of this procedure, the correct resistance for a lamp is less than 200 ohms. STOP.

2. CHECK THE HARNESS.

   1. Turn the key start switch and the disconnect switch to the OFF position.

   2. Remove the jumper wire from wire 636-BU(Blue) to frame ground and make sure that the payload lamp is connected to the machine harness.

   3. Disconnect the machine harness from the VIMS main module.

   4. At the machine harness connector for the VIMS main module, measure the resistance between contact 23 (wire 636-BU(Blue)) and frame ground.

      Expected Result: The resistance is greater than 100 ohms.

      Results:

      • OK - The resistance is greater than 100 ohms. The harness circuit is open. Proceed to 3.

      • NOT OK - The resistance is less than 100 ohms. The harness circuit resistance is correct. Replace the VIMS main module. Refer to the Testing and Adjusting, "Module - Replace" section. STOP.

3. CHECK THE HARNESS.

   1. At the payload lamp, disconnect wire 636-BU(Blue) from the socket of the payload lamp.

   2. Measure the resistance in the signal circuit (wire 636-BU(Blue)) between the connector contact 23 of the VIMS main module and the lamp socket.

   3. Measure the resistance in the ground circuit (wire A251-BK(Black) or J841-YL(Yellow)) between the lamp socket and the frame ground.

      Expected Result: The resistance is less than 5 ohms.

      Results:

      • OK - The resistance is less than 5 ohms. The circuits are correct. STOP.

      • NOT OK - The resistance is greater than 5 ohms. The circuits are NOT correct. Repair the machine harness or replace the machine harness. STOP.