John Deere 002850.06 – CSC: High Amp Draw On Radio Aerial Radio (CSC)

The Cab Suspension Control (CSC) unit has registered an abnormally high electrical current flowing through the circuit connected to the radio antenna. This condition can be caused by a short circuit in the antenna cable, a faulty antenna, or an issue with the radio's internal components. An excessive current draw can lead to component damage, blown fuses, and poses a potential fire risk.

• 4050
• 4250
• 4450
• 6R Series
• 7R Series
• 9R Series
• 5E Series
• 5M Series
• 6E Series
• 6B Series

1. 1

   Visually inspect the radio antenna mast for physical damage and trace the antenna cable from the roof mount to the radio, looking for pinching, chafing, or damaged insulation.

2. 2

   Check for parasitic draw by connecting a multimeter in series with the negative battery cable after allowing modules to sleep (approx. 20 minutes). A draw over 100 mA (0.1 A) is excessive. Pull fuses starting with the radio to isolate the circuit.

3. 3

   Perform an antenna ground test by checking for continuity (low resistance) between the metallic base of the antenna mount and a known good chassis ground. If the resistance is high, the ground connection is poor and needs to be cleaned or re-established.

4. 4

   Perform an antenna cable test by disconnecting the cable from the radio and checking for a short circuit between the center pin and the outer shield (should be infinite resistance).

5. 5

   Check for continuity on the center pin from one end of the cable to the other, and separately for the outer shield.

1. 1

   Disconnect power

   Disconnect the battery ground cable before conducting any electrical repairs to prevent personal injury or damage to components.

2. 2

   Access components

   Remove the radio bezel and any necessary trim panels to gain access to the back of the radio and its wiring connections, including the antenna cable.

3. 3

   Isolate the component

   Disconnect the antenna cable from the radio. Reconnect the battery and operate the tractor. If the fault code does not return, the fault is likely in the antenna or its cabling. If the code persists, the issue may be with the radio itself.

4. 4

   Test or replace the antenna

   If the fault is isolated to the antenna circuit, perform the ground and cable tests. If the antenna cable is shorted or the antenna base shows signs of corrosion or damage, replace the antenna assembly.

5. 5

   Test or replace the radio

   If the fault code remains even with the antenna disconnected, disconnect the radio's main power connector. If the high current draw disappears, the radio likely has an internal short and should be replaced.

6. 6

   Reassemble and verify

   After replacing the faulty component, reassemble all trim panels and bezels. Reconnect the battery, clear any stored diagnostic trouble codes, and operate the machine to ensure the fault does not reappear.