DTC B1277-11: Back-Up Light Circuit Malfunction [Electrical Supply Unit (ESU)]: Notes

DTC B1277-11: (ELECTRICAL SUPPLY UNIT) DETECTION CONDITION AND POSSIBLE CAUSE

Description	Back-up light circuit malfunction
Detection condition	Electrical supply unit (ESU) detects a short to ground in the back-up light circuit with the ignition switched ON (engine off or on).
Fail-safe	Not applicable
Possible cause	Back-up light bulb (LH) malfunction Back-up light bulb (RH) malfunction Back-up light (LH) connector or terminal malfunction Back-up light (RH) connector or terminal malfunction Electrical supply unit (ESU) connector or terminal malfunction Short to ground in wiring harness between the following terminals: Electrical supply unit (ESU) terminal 2Q-Back-up light (LH) terminal A Electrical supply unit (ESU) terminal 2Q-Back-up light (RH) terminal A Electrical supply unit (ESU) malfunction
Courtesy of MAZDA MOTORS CORP.