← Expert
Autopapyrus · Nissan Expert (1st generation)
https://autopapyrus.com/guides/nissan/expert/hazard-warning-light-diagnosis-and-repair/
Compiled automatically from service literature and owner experience. Specs are for the typical configuration — check them against your exact car before you start.

Nissan Expert (1st generation): Hazard Warning Light Diagnosis and Repair

The hazard warning system (all turn signals flash at the same time) works through the switch on the dash and a flasher relay. Failure is most often caused by a blown fuse, worn switch contacts, a faulty relay, or broken or corroded wiring. The exact wiring diagram and relay location for this version are not documented in publicly available service materials, so the general diagnostic procedure is given below. Check specific fuse numbers against the markings on the fuse box cover.

Difficulty: Medium Time: 1-2 hours Steps: 9 Tools: Multimeter or 12 V test lamp, screwdriver set, plastic trim removal tools, socket set, soldering iron and heat-shrink tubing if needed, contact grease

Part

  • 🔩 Depends on the diagnosis. Typical candidates: hazard warning switch (complete with illumination), turn signal/hazard flasher relay, circuit fuse, turn signal bulbs

Step by step

9 steps
  1. Identify the symptom. If none of the lights work, look for the cause in the power supply, relay, or switch. If one side or one bulb does not work, look at the bulb, the socket, or the ground. If the flashing is too fast, a bulb has burned out or has a poor contact. If the turn signals do not work either, the shared relay or the fuse is probably faulty.
  2. Check the turn signal bulbs and the side repeater lights. Remove each one, inspect the base and the glass, clean any oxidized socket contacts, and apply contact grease. Fast flashing almost always means a burned-out bulb.
  3. Find the fuse box in the cabin (usually under the instrument panel on the driver's side) and, if necessary, the fuse box under the hood. Using the diagram on the cover, find the fuse for the turn signal and hazard warning circuit. Remove it, inspect the filament, and test it with a multimeter. Replace it only with a fuse of the same rating. If the new fuse blows immediately, look for a short circuit in the wiring instead of installing a higher-rated fuse.
  4. Check the flasher relay. It is usually located in the fuse box or next to it, under the panel. Turn on the hazard lights and the turn signals and listen for clicks. If there are no clicks, swap the relay for a known good one with the same pin layout and check operation.
  5. Cut the power: disconnect the negative battery terminal and wait a few minutes. Carefully pry off the decorative bezel or trim around the hazard switch with a plastic trim tool and pull the switch out of the panel. Do not use metal tools, so you do not scratch the plastic or damage the clips.
  6. Disconnect the switch connector, reconnect the battery, and use a multimeter to check the connector for 12 V power and ground. Then bridge the switch contacts with a jumper wire according to the wiring diagram. If the hazard lights work, the switch is faulty. Replace it. Disassembling the switch and cleaning the contacts is acceptable only as a temporary measure.
  7. If there is no power at the connector, test the wires from the fuse box and relay to the switch and on to the lights. Inspect the places where the harness flexes: the door pillars, the passage into the cargo area, and the rear lights. Typical faults are broken wires, corroded connectors, and bad ground points. Repair breaks by soldering and using heat-shrink tubing, not by twisting the wires together.
  8. Check the ground of the lights. If only one side does not work, clean the ground point down to bare metal, tighten it, and coat it with contact grease.
  9. Reassemble in reverse order, reconnect the battery, and test all modes: hazard lights with the ignition on and off, left and right turn signals, and the repeaters on the mirrors or fenders if fitted. Make sure the flashing rate is even.

Common mistakes and warnings

  • Disconnect the negative battery terminal before doing any work on connectors. This is especially important near the airbags in the dash and steering column: do not disconnect their connectors and do not work near them without disconnecting the power. Do not install fuses with a higher rating and do not bypass the protection with a jumper wire, as this can cause the wiring to overheat and catch fire. The hazard warning system is a safety feature, so do not drive in poor visibility until it is repaired. If you cannot find the cause, or the fuses keep blowing after the repair, take the vehicle to an auto electrician for diagnosis of the wiring and control units.