why does my Toyota Highlander Third Generation (2014-2019) make a weird noise when starting

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to ensure safety while working on electrical components.

2. Battery Inspection and Replacement

• Sub-steps:
  1. Clean the battery terminals with a wire brush to remove any corrosion.
  2. Ensure that the battery connections are tight and secure.
  3. If the battery is below 12.6 volts, replace it with a new one of the same specifications (typically Group 24F for Highlander).

3. Starter Motor Inspection and Replacement

• Sub-steps:
  1. Remove the starter motor by disconnecting the wiring harness and the mounting bolts.
  2. Inspect the starter for wear or damage, particularly the gear and solenoid.
  3. If defective, install a new starter motor, ensuring that all connections are secure.
  4. Torque the mounting bolts to the manufacturer’s specifications (usually around 11-16 ft-lbs).

4. Serpentine Belt Inspection and Replacement

• Sub-steps:
  1. Visually inspect the serpentine belt for signs of wear, cracking, or misalignment.
  2. If damaged, remove the belt using a serpentine belt tool to relieve tension from the tensioner.
  3. Install a new serpentine belt, ensuring it follows the correct routing path indicated on the belt cover.
  4. Check the tensioner and pulleys for proper operation and replace if necessary.