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 MANUALSMAZDA20113 MAZDASPEED, 2.3 3REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 615 (CONTROL SYSTEM [BODY CONTROL MODULE))BODY CONTROL MODULE (BCM) INSPECTIONNOTES
2011 Mazda 3 Mazdaspeed, 2.3 3
Body Control Module (BCM) Inspection: Notes
2011 Mazda 3 Mazdaspeed, 2.3 3SECTION Notes
WARNING: This page is about a different car, the 2010 Mazda 3. However, it is still accessible from the selected car via links, so may be relevant.
- Remove the following parts:
- Front scuff plate (LH) (See FRONT SCUFF PLATE REMOVAL/INSTALLATION .)
- Front side trim (LH) (See FRONT SIDE TRIM REMOVAL/INSTALLATION .)
- Upper panel (See UPPER PANEL REMOVAL/INSTALLATION .)
- Shift knob (MTX) (See MANUAL TRANSAXLE SHIFT MECHANISM REMOVAL/INSTALLATION .)
- Selector lever knob (ATX) (See AUTOMATIC TRANSAXLE SHIFT MECHANISM REMOVAL/INSTALLATION .)
- Shift panel (See SHIFT PANEL REMOVAL/INSTALLATION .)
- Side wall (See SIDE WALL REMOVAL/INSTALLATION .)
- Console (See CONSOLE REMOVAL/INSTALLATION .)
- Set the hood release lever out of the way. (See HOOD LATCH AND RELEASE LEVER REMOVAL/INSTALLATION .)
- Remove the lower panel, (driver-side) (See LOWER PANEL REMOVAL/INSTALLATION .)
- Set the starter cut relay out of the way. (with advanced keyless entry and push button start system) (MTX) (see STARTER CUT RELAY REMOVAL/INSTALLATION [MTX] .)
- Remove the BCM with the connector connected. (See BODY CONTROL MODULE (BCM) REMOVAL/INSTALLATION .)
- Measure the voltage at each terminal is as indicated in the Terminal Voltage Tables.
- If the voltage or continuity is not as specified in the Terminal Voltage Table, inspect the parts under "Inspection item (s)".
- If the system does not work properly even though the parts or related wiring harnesses do not have any malfunction, replace the BCM.
- If the voltage or continuity is not as specified in the Terminal Voltage Table, inspect the parts under "Inspection item (s)".
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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.