why are my Toyota RAV4 headlights flickering at night

Solution

1. Preparation

• Gather tools and materials:
  • Socket set
  • Multimeter
  • OBD-II scanner
  • Wire brush (for cleaning connections)
  • Electrical tape
• Ensure the vehicle is parked on a flat surface with the engine off and the keys removed.

2. Inspect and Replace Headlight Bulbs

• Remove the headlight housing by unscrewing the retaining screws.
• Disconnect the wiring harness from the back of the headlight bulb.
• Remove the old bulb and inspect for any damage.
• Insert a new bulb, ensuring it is seated properly, and reconnect the wiring harness.
• Reattach the headlight housing and secure with screws.

3. Check and Clean Battery Connections

• Disconnect the negative battery terminal using a wrench.
• Inspect the positive terminal for corrosion; clean it using a wire brush if necessary.
• Reconnect the terminals and ensure they are tight.

4. Test Alternator Output

• Start the engine and use a multimeter to measure voltage at the battery terminals.
• The voltage should read between 13.8 to 14.4 volts. If not, the alternator may need to be replaced.

5. Inspect Wiring and Relays

• Visually inspect the wiring harness for any frays or damage.
• Use a multimeter to test the headlight relay for continuity.
• Replace the relay if it shows signs of failure.