DTC B1142-13: Ignition Switch Status Mismatch [Electrical Supply Unit (ESU)]: Notes

DTC B1142-13: (ELECTRICAL SUPPLY UNIT) DETECTION CONDITION AND POSSIBLE CAUSE

Description	Ignition switch status mismatch
Detection condition	The electrical supply unit (ESU) detects the following mismatches. Ignition switch status determined from power supply condition in BCM received from BCM via LIN communication Ignition switch status determined from power supply input condition of electrical supply unit (ESU) power supply circuit (IG1)
Fail-safe	Not applicable
Possible cause	BCM connector or terminal malfunction Electrical supply unit (ESU) connector or terminal malfunction BCM power supply circuit (IG1) malfunction Short to ground in the wiring harness between METER1 10 A fuse and BCM terminal 3O METER1 10 A fuse malfunction Open circuit in wiring harness between IG1 relay terminal C and BCM terminal 3O Electrical supply unit (ESU) power supply circuit (IG1) malfunction Short to ground in the wiring harness between METER1 10 A fuse and electrical supply unit (ESU) terminal 1H METER1 10 A fuse malfunction Open circuit in wiring harness between IG1 relay terminal C and electrical supply unit (ESU) terminal 1H Short to ground in wiring harness between BCM terminal 2Y and electrical supply unit (ESU) terminal 2I Short to power supply in wiring harness between BCM terminal 2Y and electrical supply unit (ESU) terminal 2I Open circuit in wiring harness between BCM terminal 2Y and electrical supply unit (ESU) terminal 2I BCM malfunction Electrical supply unit (ESU) malfunction
Courtesy of MAZDA MOTORS CORP.