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DTC B1812: Notes

DTC B1812 DETECTION CONDITION POSSIBLE CAUSE

DTC B1812 Backup light switch input circuit short to battery
DETECTION CONDITION  Short to power supply in wiring harness between PJB and back-up light switch
POSSIBLE CAUSE 
  • Short to power supply in wiring harness between PJB terminal J-01 AE and back-up light switch terminal B (MTX)
  • Short to power supply in wiring harness between PJB terminal J-01 AE and TR switch terminal D (ATX)
  • Back-up light switch malfunction (MTX)
  • TR switch malfunction (ATX)
  • PJB malfunction
G04956593Courtesy of MAZDA MOTORS CORP.