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Home >> Mazda >> 2021 >> CX-9 Signature >> Repair and Diagnosis >> External Pages >> Different car >> Section 112 (Lighting System) >> Brake Light Unit Inspection >> Notes

Brake Light Unit Inspection: Notes

WARNING: This page is about a different car, the 2017 Mazda 3. However, it is still accessible from the selected car via links, so may be relevant.
  1. Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION .)
  2. Perform the following procedure.

    Sedan (4SD)

    1. Remove the following parts.
      1. Rear scuff plate (See REAR SCUFF PLATE REMOVAL/INSTALLATION .)
      2. Rear seat cushion (See REAR SEAT CUSHION REMOVAL/INSTALLATION .)
      3. Rear seat back (See REAR SEAT BACK REMOVAL/INSTALLATION .)
      4. Tire house trim (See TIRE HOUSE TRIM REMOVAL/INSTALLATION .)
      5. C-pillar trim (See C-PILLAR TRIM REMOVAL/INSTALLATION .)
      6. High-mount brake light (See HIGH-MOUNT BRAKE LIGHT REMOVAL/INSTALLATION .)
      7. Rear package trim (See REAR PACKAGE TRIM REMOVAL/INSTALLATION .)

    Hatchback (5HB)

    1. Partially peel back the following parts.
      1. Tire house trim (LH) (See TIRE HOUSE TRIM REMOVAL/INSTALLATION .)
      2. Trunk side upper trim (LH) (See TRUNK SIDE UPPER TRIM REMOVAL/INSTALLATION .)
      3. Trunk side trim (LH) (See TRUNK SIDE TRIM REMOVAL/INSTALLATION .)
  3. Reconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION .)
  4. Verify that the voltages of each of the terminals are as indicated in the terminal voltage table.
    • If the voltage is not as indicated in the table, inspect the parts under Inspection item (s).
      • If the system does not work normally even though the parts or related wiring harnesses do not have any malfunction, replace the brake light unit. (See BRAKE LIGHT UNIT REMOVAL/INSTALLATION .)
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