CSM 000168.04 (CSM 168.04) — CSM Unswitched Supply Voltage Low

CSM 000168.04 (CSM 168.04)

Code: 000168.04

Shortcode: 168.04


This error code, CSM 168.04, indicates that the unswitched supply voltage to the Cab Switch Module (CSM) has dropped below 9.0 volts. This issue may be caused by problems with the battery, wiring, or connectors providing power to the CSM.


The CSM will disable its functions, effectively turning them off to prevent further complications and protect the system.


Inspect Power Supply:

  • Verify the power source, ensuring the battery is providing sufficient voltage. Check for signs of battery degradation or low charge levels.

Check Wiring and Connectors:

  • Inspect all wiring and connectors related to the CSM for damage, wear, or loose connections. Clean and secure all connections to ensure proper electrical contact.

Measure Supply Voltage:

  • Use a multimeter to measure the voltage at the CSM input. Ensure it is above 9.0 volts. If not, identify and correct the source of the voltage drop.

Evaluate Charging System:

  • Check the alternator and voltage regulator for proper operation. Confirm that they are charging the battery correctly and maintaining appropriate voltage levels.

Reset System:

  • After resolving the issue, reset the CSM and test the system to ensure proper functionality is restored.


Regular maintenance and inspection of the electrical system, including batteries, wiring, and connectors, can prevent such issues. Ensuring a stable power supply to the CSM is crucial for the reliable operation of the equipment.

Control Units: John Deere

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