Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSMAZDA20105 SPORT, 2.3 L, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)ACCESSORIES & EQUIPMENTCOMMUNICATION DEVICESON-BOARD DIAGNOSTIC [BODY CONTROL SYSTEM]DTC B1873 [CONTROL SYSTEM]NOTES

2010 Mazda 5 Sport, 2.3 L, Standard

DTC B1873 [Control System]: Notes

2010 Mazda 5 Sport, 2.3 L, StandardSECTION Notes

DTC B1873 DETECTION CONDITION AND POSSIBLE CAUSE

DTC B1873	Hazard warning switch input circuit short to ground
DETECTION CONDITION	Short to ground in wiring harness between BCM and hazard warning switch.
POSSIBLE CAUSE	Hazard warning switch connector or terminals malfunction BCM connector or terminals malfunction Short to ground in wiring harness between hazard warning switch terminal D and BCM terminal 3W Hazard warning switch malfunction BCM malfunction
Courtesy of MAZDA MOTORS CORP.

RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.