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Home >> Infiniti >> 2016 >> Q50 Base, RWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 123 (Hybrid Motor System (Diagnostic Trouble Codes (DTCS) P2122-P31FF And Circuit Diagnosis) (Hybrid)) >> DTC / Circuit Diagnosis >> Brake Switch >> Diagnosis Procedure >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different variant/trim than selected.

  1. CHECK DTC WITH ELECTRICALLY-DRIVEN INTELLIGENT BRAKE UNIT

    Check DTC with electrically-driven intelligent brake unit. Refer to CONSULT FUNCTION .

    Is the inspection result normal?

    YES 

    GO TO STEP 2  .

    NO 

    Perform diagnosis procedure corresponding to DTC indicated. Refer to DTC INDEX .

  2. CHECK BRAKE PEDAL POSITION SWITCH CIRCUIT

    G-20 With CONSULT

    1. Turn ignition switch ON.
    2. Select "ASCD BRAKE SW" in "DATA MONITOR" mode of "EV/HEV" using CONSULT.
    3. Check that monitor indication as per the following condition.
      Monitor item Condition Indication
      ASCD BRAKE SW Brake pedal Slightly depressed Off
      Fully released On

    G-21 Without CONSULT

    1. Turn ignition switch ON.
    2. Check the voltage HPCM harness connector terminals as per the following condition.
      + - Condition Voltage
      (Approx.)
      HPCM
      Connector Terminal
      B15 59 Ground Brake pedal Slightly depressed 0 V
      Fully released Battery voltage

    Is the inspection result normal?

    YES 

    Perform INTERMITTENT INCIDENT .

    NO 

    GO TO STEP 3  .

  3. CHECK BRAKE PEDAL POSITION SWITCH POWER SUPPLY

    1. Turn ignition switch OFF.
    2. Disconnect brake pedal position switch harness connector.
    3. Turn ignition switch ON.
    4. Check the voltage between brake pedal position switch harness connector and ground.
      + - Voltage
      Brake pedal position switch
      Connector Terminal
      E43 1 Ground Battery voltage

    Is the inspection result normal?

    YES 

    GO TO STEP 4  .

    NO 

    Perform the trouble diagnosis for power supply circuit.

  4. CHECK STOP LAMP OFF RELAY 1

    Check stop lamp OFF relay 1. Refer to COMPONENT INSPECTION (STOP LAMP OFF RELAY 1) .

    Is the inspection result normal?

    YES 

    GO TO STEP 5  .

    NO 

    Replace stop lamp OFF relay 1.

  5. CHECK STOP LAMP OFF RELAY 2

    Check stop lamp OFF relay 2. Refer to COMPONENT INSPECTION (STOP LAMP OFF RELAY 2) .

    Is the inspection result normal?

    YES 

    GO TO STEP 6  .

    NO 

    Replace stop lamp OFF relay 2.

  6. CHECK BRAKE PEDAL POSITION SWITCH INPUT SIGNAL CIRCUIT

    1. Turn ignition switch OFF.
    2. Disconnect HPCM harness connector.
    3. Check the continuity between brake pedal position switch harness connector and HPCM harness connector.
      + - Continuity
      Brake pedal position switch HPCM
      Connector Terminal Connector Terminal
      E43 2 B15 59 Existed
    4. Also check harness for short to ground and to power.

    Is the inspection result normal?

    YES 

    GO TO STEP 7  .

    NO 

    Repair or replace error-detected parts.

  7. CHECK BRAKE PEDAL POSITION SWITCH

    Check brake pedal position switch. Refer to COMPONENT INSPECTION (BRAKE PEDAL POSITION SWITCH) .

    Is the inspection result normal?

    YES 

    Perform INTERMITTENT INCIDENT .

    NO 

    Replace brake pedal position switch. Refer to REMOVAL AND INSTALLATION .

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