SSU 523652.02 – Control Unit Connected to Wrong Wiring Harness Connector

SSU 523652.02 (SSU )

Code: 523652.02



This diagnostic trouble code (DTC), SSU 523652.02, is triggered when the SSU control unit detects an erroneous signal in the circuit of the control unit identification. This indicates that the control unit may be connected to the wrong wiring harness connector.


When this error is detected, the control unit may not function correctly, potentially leading to issues with the vehicle’s steering system.


Verify Wiring Harness Connections:

  • Inspect the wiring harness connections to ensure that the SSU control unit is connected to the correct connector.
  • Verify that all connections are secure and match the manufacturer’s specifications.

Check for Erroneous Signals:

  • Use diagnostic tools to check for any erroneous signals in the control unit identification circuit.
  • Ensure that the wiring harness and connectors are free from damage, loose connections, or corrosion.

Update Software:

  • Ensure that the SSU software is up-to-date. Apply any available firmware updates to address potential software-related issues.

Replace Faulty Components:

  • If the wiring harness or connectors are found to be defective, replace them with new, genuine parts.

Consult Technical Support:

  • If the error persists after performing the above steps, consult technical support or the manufacturer for further assistance.


  • Regular maintenance and inspection of the wiring harness and connectors can help prevent incorrect connections.
  • Ensuring that all connections are made according to the manufacturer’s specifications is crucial for the reliable operation of the vehicle’s systems.

Control Units: John Deere

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