Description:

This error code indicates that the switched supply voltage to the Selective Control Valve Unit VII (SV VII) has dropped below 9.0 V. This condition can occur due to various reasons such as a weak power source, poor connections, or electrical faults in the supply circuit.

Reaction:

When this error code is detected, the Selective Control Valve Unit VII may not operate correctly, potentially leading to reduced hydraulic functionality or complete failure of the valve to respond.

Recommendations:

Inspect Voltage Supply:

• Check the voltage supply to SV VII to ensure it is within the acceptable range (above 9.0 V). Use a multimeter to measure the voltage at the supply point.

Inspect Wiring and Connections:

• Examine the wiring and connectors leading to SV VII for any signs of damage, corrosion, or loose connections. Repair or replace any faulty components.

Vehicle Load Center (VLC) Diagnostics:

• Perform diagnostics on the Vehicle Load Center (VLC) control unit. Since the wake-up circuit of the VLC is the voltage source, it’s crucial to diagnose and resolve any issues within the VLC first. Look for any associated VLC error codes and address them accordingly.

Battery and Charging System:

• Inspect the battery and charging system to ensure they are functioning correctly and providing stable voltage.

Consult Technical Support:

• Contact John Deere technical support if the issue persists after performing the above steps. They can provide further guidance and advanced diagnostic procedures.

Note:

This error code and other related 000158.XX codes can appear in various control units. It is essential to start diagnostics with the VLC control unit, as it is the primary voltage source for the wake-up circuit. Regular maintenance and inspections of the electrical system can help prevent such issues from arising.