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 MANUALSMAZDA20066 S, 4D SEDAN, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)QUICK LOOKUPSDTC INDEXBODY CONTROL SYSTEM
2006 Mazda 6 s, 4D Sedan, Standard
Body Control System
2006 Mazda 6 s, 4D Sedan, StandardSECTION Body Control System
BODY CONTROL MODULE (BCM) DIAGNOSTIC TROUBLE CODE (DTC) LIST
| DTC | Description | Detection condition |
|---|---|---|
| DTC B1317 | Battery voltage high | Input voltage from the battery is excessively high |
| DTC B1318 | Battery voltage low | Input voltage from the battery is excessively low |
| DTC B1342 | ECU is faulted | BCM microcomputer malfunction |
| DTC B2572 | Driver door lock switch short to ground | Short to GND in wiring harness between BCM and driver-side door lock-link switch |
| DTC B2721 | Trunk lid ajar output short to ground | Short to GND in wiring harness between BCM and trunk compartment light switch |
| DTC B1873 | Turn signal/hazard power feed circuit short to ground | Short to GND in wiring harness between BCM and hazard warning switch |
| DTC B1320 | Door ajar LF circuit open | Open circuit in wiring harness between BCM and door switch (driver-side) |
| DTC B1328 | Door ajar RF circuit open | Open circuit in wiring harness between BCM and door switch (passenger-side) |
| DTC B1572 | Door ajar LR circuit open | Open circuit in wiring harness between BCM and door switch (LH) |
| DTC B1614 | Rear wiper interval switch input circuit short to ground | Short to GND in wiring harness between BCM and rear wiper and washer switch (INT) |
| DTC B1520 | Hood latch switch circuit open | Open circuit in wiring harness between BCM and hood latch switch |
| DTC B1506 | Light turn signal right circuit short to ground | Short to GND in wiring harness between BCM and turn switch |
| DTC B2218 | Door lock switch circuit short to ground | Short to GND in wiring harness between BCM and door lock switch |
| DTC B1311 | Unlock switch circuit open | Open circuit in wiring harness between BCM and driver-side door lock-link switch (unlock signal) |
RENDER: 1.0x
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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.