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Home >> Mazda >> 2021 >> CX-3 FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 47 (On-Board Diagnostic - Body Control Module) >> DTC U0515-41: Error Signal Received From Start Stop Unit >> Notes
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DTC U0515-41: Error Signal Received From Start Stop Unit: Notes

WARNING: This page is about a different car, the 2016 Mazda CX-3. However, it is still accessible from the selected car via links, so may be relevant.
Description  Error signal received from start stop unit
Detection condition 
  • Check sum error occurred on communication with the BCM and the start stop unit 3 times continuously  with the ignition switched ON (engine off or on).
Fail-safe  Exterior lighting system 
  • Turn the TNS (parking lights) and headlights LO on, and turn off other exterior light controls.

    Auto light system 

  • Continue the controls prior to the auto light malfunction detection.

    Windshield wiper system 

  • Continue the controls prior to the windshield wiper malfunction detection.

    Front washer system 

  • Stop the front washer control.

    Auto wiper system 

  • Continue the controls prior to the windshield wiper malfunction detection.
Possible cause 
  • Start stop unit malfunction
  • BCM malfunction
System wiring diagram  Not applicable