Component Tests and General Diagnostics

2009 Mazda 6 V6-3.7LSECTION Component Tests and General Diagnostics



BODY CONTROL MODULE (BCM) INSPECTION

1. Remove the front scuff plate. (driver-side) Front Scuff Plate Removal/Installation

2. Remove the front side trim. (driver-side) Front Side Trim Removal/Installation

3. Remove the BCM with the connector connected. Service and Repair

4. Measure the voltage at each terminal is as indicated in the Terminal Voltage Tables.

- If the voltage 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.

Terminal Voltage Table (Reference)






Terminal Voltage Table (Reference) (Part 1):





Terminal Voltage Table (Reference) (Part 2):





Terminal Voltage Table (Reference) (Part 3):





Terminal Voltage Table (Reference) (Part 4):





Terminal Voltage Table (Reference) (Part 5):





Terminal Voltage Table (Reference) (Part 6):





Terminal Voltage Table (Reference) (Part 7):





Terminal Voltage Table (Reference) (Part 8):





Terminal Voltage Table (Reference) (Part 9):





Terminal Voltage Table (Reference) (Part 10):






*1
With theft-deterrent system
*2
With car-navigation system
*3
With advanced keyless entry and push button start system
*4
Without advanced keyless entry and push button start system

Generated pulse (reference)

Pattern 1





- Terminal: 8G (+) -> body ground (-)
- Oscilloscope setting: 2 V/DIV (Y), 1 ms/DIV (X), DC range

Pattern 2





- Terminal: 8G (+) -> body ground (-)
- Oscilloscope setting: 1 V/DIV (Y), 1 ms/DIV (X), DC range

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:

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