2004 Nissan-Datsun Sentra SE-RFACTORY OEM SERVICE PROCEDURE

Fail-Safe Function

WARNING: This page is about a different car, the 2003 Lexus LS 430. However, it is still accessible from the selected car via links, so may be relevant.

HINT:

The Headlight Leveling Control ECU performs the fail-safe when detecting following troubles.

At this it lights the warning light ("HEADLIGHT LEVELING") on the combination meter (multi-information display

FAIL-SAFE FUNCTION

Trouble Area System
1. Headlight leveling actuator
  • Open circuit
  • Short circuit
2. Vehicle speed sensor One vehicle speed signal is 0km/h and the other is 10km/h (8 MPH) or more.
3. Generator
  • Open circuit
  • Short circuit
4. Height control sensor Signal lever error
5. Pitch angle calculation error Signal lever error

Recovery condition (The warning light goes off.)

  • In case of 1, 2 and 3: ignition switch OFF
  • In case of 4 and 5: ignition switch OFF or signal lever error cancellation
Factory Service Tools

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • β€’ You smell fuel, burning insulation, or see smoke.
  • β€’ Brakes feel soft, pull hard to one side, or make grinding noises.
  • β€’ The engine overheats, stalls repeatedly, or misfires under load.
  • β€’ You are missing required tools, torque specs, or safe lifting equipment.
  • β€’ You are not confident in the next step or safety outcome.

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