my Toyota Highlander XU70 (2020-Present) won't start at all what should I check

Solution

1. Preparation

• Ensure the vehicle is in "Park" or "Neutral."
• Disconnect the negative battery terminal to prevent electrical shock.

2. Battery Inspection

• Tools Required: Multimeter, wrench set
• Sub-steps:
  1. Reconnect the battery if it was previously disconnected.
  2. Use a multimeter to measure the voltage. If it is below 12.4 volts, proceed to jump-start the vehicle or replace the battery.

3. Check Battery Connections

• Tools Required: Wrench set, wire brush
• Sub-steps:
  1. Inspect and clean the battery terminals using a wire brush to remove corrosion.
  2. Tighten the battery terminal connections to ensure a solid connection.

4. Inspect the Ignition Switch

• Tools Required: Screwdriver set, multimeter
• Sub-steps:
  1. Remove the steering column cover.
  2. Test the ignition switch with a multimeter to ensure it is functioning properly when the key is turned.

5. Check Starter and Relays

• Tools Required: Wrench set, socket set
• Sub-steps:
  1. Locate the starter motor and check the wiring for damage.
  2. Test the starter relay by swapping it with another similar relay in the fuse box to see if the starter engages.

6. Replace Components if Necessary

• Tools Required: Socket set, torque wrench
• Sub-steps:
  1. If the starter motor is faulty, remove it by unbolting it from its mount.
  2. Install the new starter motor and torque bolts to the manufacturer’s specifications.