2002 Infiniti Q45FACTORY OEM SERVICE PROCEDURE

Control Unit Input/Output Signal Standard: Notes

  • (Note 1): When the parking brake is checked using a circuit tester for voltage measurement, the connector terminals should not extend forcefully.
  • (Note 2): Check the pressure of the tire in normal condition.
  • (Note 3): ON/OFF timing of the ABS warning lamp:
    1. ON: When the ignition switch is turned ON (before engine start) or a malfunction is detected.
    2. OFF: 2 seconds after the engine started (the system is in normal condition).
  • (Note 4): VDC OFF indicator lamp ON/OFF timing
    1. ON: When the ignition switch is turned ON (before engine start) or a malfunction is detected, if the TCS OFF switch is ON.
    2. OFF: 2 seconds after the engine started (the system is in normal condition) and TCS OFF switch is OFF.
  • (Note 5): ON/OFF timing of the SLIP indicator lamp.
    1. ON: When the ignition switch is turned ON (before engine start) or a malfunction is detected, if the VDC/TCS function is active during driving.
    2. OFF: 2 seconds after the engine started (the system is in normal condition) and the VDC/TCS function is inactive.
    3. Flashing: VDC/TCS function is active during driving.


  • (Note 1): Check the pressure of the tire in normal condition.
  • (Note 2): ON/OFF timing of the ABS warning lamp:
    1. ON: For approximately 0.5 seconds after the ignition switch is turned ON, or when a malfunction is detected.
    2. OFF: Approximately 0.5 seconds after the ignition switch is turned ON (when the system is in normal operation).
  • (Note 3): ON/OFF timing of the VDC OFF indicator lamp:
    1. ON: For approximately 0.5 seconds after the ignition switch is turned ON, or when a malfunction is detected VDC OFF switch is ON.
    2. OFF: Approximately 0.5 seconds after the ignition switch is turned ON (when the system is in normal operation) or when VDC OFF switch is OFF.
  • (Note 4): SLIP indicator lamp ON/OFF timing:
    1. ON: For approximately 0.5 seconds after the ignition switch is turned ON, or when a malfunction is detected VDC/TCS function is activated while driving.
    2. OFF: Approximately 0.5 seconds after the ignition switch is turned ON (when the system is in normal operation) or when VDC/TCS function is not activated.
    3. Flashing: VDC/TCS function is active during driving.
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.