John Deere 000168.04 – CSM: Low Voltage to Arm Rest Module

The unswitched supply voltage to the Arm Rest Module (CSM) is below the required operational threshold, which may affect its proper operation. This is a general electrical system fault that can be triggered by high electrical load, charging system issues, or wiring problems.

• 6R Series
• 7R Series
• 8R Series
• 8RT Series
• 9R Series
• 9RT Series
• 9RX Series
• 9430
• 9530
• 9630
• 9560
• 9660
• 9670 STS
• 9770 STS
• S-Series
• 7760
• 7630
• 7830
• 8330
• 8430
• 6930

1. 1

   Reduce electrical load by turning off non-essential high-draw components (e.g., lights, HVAC) to see if the code clears

2. 2

   Increase engine RPM to increase alternator output, which may resolve a temporary voltage drop

3. 3

   Cycle power by shutting down the tractor, waiting for a brief period, and restarting the engine

4. 4

   Visually inspect battery terminals, cables, and alternator connections for corrosion, damage, or loose fittings

5. 5

   Verify the battery has at least 12.6 volts when fully charged using a multimeter

6. 6

   Inspect fuses related to the CSM (e.g., fuse F5 in some 8R models). Removing and reinstalling the fuse after a 30-second wait can sometimes restore functionality

1. 1

   Confirm diagnosis

   Use preliminary checks to isolate the cause. If reducing load or increasing RPMs resolves the issue, the problem may lie with alternator capacity or a high-demand electrical component.

2. 2

   Address connection issues

   If corrosion or loose connections are found at the battery or alternator, disconnect the battery, clean all contact points thoroughly, and securely retighten all connections.

3. 3

   Replace blown fuses

   If a blown fuse is found, replace it with a new one of the same rating. If the fuse blows again, this indicates a short circuit that requires tracing the wiring to repair.

4. 4

   Test charging system

   If voltage remains low, test the alternator's output to ensure it is functioning correctly and providing adequate voltage and amperage to the system.

5. 5

   Test module power and ground

   If the charging system is healthy, use a multimeter to test for proper voltage and a solid ground connection directly at the connector of the Arm Rest Module (CSM). Refer to the machine's specific technical manual (e.g., TM110419, TM110019) for exact procedures.

6. 6

   Replace the module

   If the module is receiving correct voltage and ground but continues to log the fault and malfunction, replace the CSM. Note that some replacement modules may require programming by a John Deere dealer.