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Body Control Module (BCM) Inspection: Notes

WARNING: This page is about a different car, the 2020 Mazda MX-5 Miata. However, it is still accessible from the selected car via links, so may be relevant.
  1. Disconnect the negative battery cable. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION .)
  2. Remove the scuff plate (driver's side). (See SCUFF PLATE REMOVAL/INSTALLATION .)
  3. Remove the front side trim (driver's side). (See FRONT SIDE TRIM REMOVAL/INSTALLATION .)
  4. Remove the BCM. (See BODY CONTROL MODULE (BCM) REMOVAL/INSTALLATION .)
  5. Connect the BCM connector.
  6. Connect the negative battery cable. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION .)
  7. Verify that the voltages of each of the terminals are as indicated in the terminal voltage table (reference). (See TERMINAL VOLTAGE TABLE (REFERENCE) .)
    • If the voltage is not as specified in the terminal voltage table (reference), inspect the parts under Inspection item(s) and related wiring harnesses.
      • If the system does not work normally even though the inspection items are normal, identify the malfunctioning location according to the directions in [DIAGNOSTIC SYSTEM] and [SYMPTOM TROUBLESHOOTING] then perform repairs.
G13491823Courtesy of MAZDA MOTORS CORP.
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