2004 Infiniti Q45FACTORY OEM SERVICE PROCEDURE

Precautions For Brake Control

  • During ABS, TCS and VDC operations of sudden deceleration and turn, brake pedal lightly vibrates and a mechanical noise may be heard. This is normal.
  • Just after starting vehicle after ignition switch ON, brake pedal may vibrate or motor operating noise may be heard from engine compartment. This is a normal status of operation check.
  • Stopping distance may be longer than that of vehicles without ABS when vehicle drives on rough, gravel, or snow-covered (fresh, deep snow) roads.
  • When an error is indicated by ABS or another warning lamp, collect all necessary information from customer (what symptoms are present under what conditions) and check for simple causes before starting diagnostic servicing. Besides electrical system inspection, check booster operation, brake fluid level, and oil leaks.
  • If tire size and type are used in an improper combination, or brake pads are not Genuine NISSAN parts, stopping distance or steering stability may deteriorate.
  • If there is a radio, antenna, or antenna lead-in wire (including wiring) near control module, ABS function may have a malfunction or error.
  • If aftermarket parts (car stereo, CD player, etc.) have been installed, check for incidents such as harness pinches, open circuits, and improper wiring.
  • If non-standard suspension parts (shock absorber, strut, spring, bushing, etc.) and reinforcements (roll bar, tower bar, etc.) are attached, or if suspension parts deteriorate significantly, VDC may not operate normally and VDC warning lamp may turn on.
  • If non-standard engine components (muffler, etc.) are attached, VDC may not operate normally and VDC warning lamp may turn on.
  • When driving on a steep slope (as a bank), VDC may not operate normally and VDC warning lamp may turn on. In this case, start engine to resume the normal screen. This is normal.
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.

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