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HOMESERVICE MANUALSACURA20043.5RLREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 59 (INSTRUMENT PANEL)SAFETY INDICATOR SYSTEMBRAKE LIGHT FAILURE SENSOR TEST
2004 Acura 3.5RL

Brake Light Failure Sensor Test

2004 Acura 3.5RLSECTION Brake Light Failure Sensor Test
WARNING: This page is about a different car, the 2003 Acura 3.2CL and 2002 Acura 3.2CL. However, it is still accessible from the selected car via links, so may be relevant.
  1. Check to see if the brake lights come on when the brake pedal is depressed.
    • If all the brake lights come on, go to step 2.
    • If one of the brake lights does not come on, check whether the bulb is blown. If the bulb is OK, go to step 2.
    • If none of the brake lights come on, check the brake light circuit (see CIRCUIT DIAGRAM -- BRAKE LIGHTS ).
  2. Open the trunk lid, and remove each side of the trunk side trim panel.

    LEFT SIDE: 

    Fig 1: Identifying Left Side Brake Light Connector Terminals
    G01164966Courtesy of AMERICAN HONDA MOTOR CO., INC.
  3. Turn the ignition switch ON (II). Measure voltage between terminal No. 5 of the 6P connectors and body ground.
    • If there is battery voltage, go to step 4.
    • If there is no battery voltage, check for an open in the YEL wire.

    RIGHT SIDE 

    Fig 2: Identifying Right Side Brake Light Connector Terminals
    G01164967Courtesy of AMERICAN HONDA MOTOR CO., INC.
  4. Make sure the BRAKE LAMP light in the safety indicator does not come on and stay on when the 6P connectors are disconnected and the engine is running. If the light does not come on and stay on, go to step 5. If the BRAKE LAMP light in the safety indicator comes on and stays on, check for:
    • A short to ground in the WHT/GRN wire between the safety indicator and the No. 4 terminal of the failure sensors.
    • A faulty safety indicator circuit in the gauge assembly.
  5. Reconnect the 6P connectors.
  6. Make sure the BRAKE LAMP light in the safety indicator comes on and goes off when the No. 3 terminal of the 6P connector is grounded, the brake pedal is depressed, and the ignition switch is turned from OFF to ON (II).
    • If the BRAKE LAMP light in the safety indicator comes on and stays on, check for:
      • Faulty sensor.
      • Incorrect brake light bulbs or installation of brake light bulbs.
    • If the BRAKE LAMP light goes off, check for:
      • A poor ground (G 601).
      • An open in the WHT/GRN or BLK wire.
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.