2012 Acura TL SH-AWD, Automatic TransFACTORY OEM SERVICE PROCEDURE

Brake Pedal Position Switch Signal Circuit Troubleshooting

  1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
  2. Check the BRAKE SWITCH in the DATA LIST with the HDS.

    Does it indicate OFF? 

    YES  - Go to step 3.

    NO  - Inspect the brake pedal position switch (see BRAKE PEDAL AND BRAKE PEDAL POSITION SWITCH ADJUSTMENT ).

  3. Press the brake pedal, and check the BRAKE SWITCH in the DATA LIST with the HDS.

    Does it change to ON? 

    YES  - The brake pedal position switch signal circuit (BKSW line) is OK.

    NO  - Go to step 4.

  4. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
  5. Jump the SCS line with the HDS.
  6. Disconnect the brake pedal position switch 4P connector.
  7. Disconnect ECM/PCM connector A (49P).
  8. Check for continuity between ECM/PCM connector terminal A8 and body ground.
    Fig 1: Checking Continuity Between ECM/PCM Connector Terminal A8 And Body Ground
    G08067255Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  - Repair short in the wire between the ECM/PCM (A8) and the brake pedal position switch. Also replace the No. 10 HORN/STOP (20 A) fuse in the under-hood fuse/relay box.

    NO  - Go to step 9.

  9. Connect brake pedal position switch 4P connector terminal No. 2 to body ground with a jumper wire.
    Fig 2: Connecting Brake Pedal Position Switch 4P Connector Terminal No. 2 To Body Ground With Jumper Wire
    G08067256Courtesy of AMERICAN HONDA MOTOR CO., INC.
  10. Check for continuity between ECM/PCM connector terminal A8 and body ground.
    Fig 3: Checking Continuity Between ECM/PCM Connector Terminal A8 And Body Ground
    G08067257Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  - Repair open in the wire between the brake pedal position switch and the No. 10 HORN/STOP (20 A) fuse in the under-hood fuse/relay box. Also check the brake pedal position switch (see BRAKE PEDAL AND BRAKE PEDAL POSITION SWITCH ADJUSTMENT ).

    NO  - Repair open in the wire between the ECM/PCM (A8) and the brake pedal position switch.

Factory Service Tools

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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.