my Toyota Highlander Third Generation (2014-2019) won't start just clicks what can I check

Solution

1. Preparation

• Tools Required: Multimeter, jumper cables, socket set, remote starter switch.
• Ensure the vehicle is in park or neutral and the parking brake is engaged.
• Disconnect the negative battery terminal before working on electrical components.

2. Battery Inspection and Replacement

1. Check Battery Voltage:

   • Use a multimeter to measure the battery voltage.
   • If the voltage is below 12.4 volts, proceed to charge or replace the battery.

2. Inspect Battery Connections:

   • Clean the terminals with a wire brush to remove corrosion.
   • Ensure connections are tight and secure; replace any damaged cables.

3. Jump-Start the Vehicle:

   • Connect jumper cables to the battery following proper jump-start procedures.
   • Attempt to start the vehicle. If it starts, the battery may need replacement.

3. Starter Motor Inspection

1. Bypass Starter:

   • Locate the starter motor and connect a remote starter switch between the battery and the starter terminal.
   • Activate the switch. If the starter engages, it may need replacement.

2. Check Starter Relay:

   • Locate the starter relay in the fuse box and test it with a multimeter for continuity.
   • Replace the relay if it is faulty.

4. Check Electrical Components

1. Inspect Fuses:

   • Visually check the fuses related to the starting system.
   • Replace any blown fuses with the same amperage rating.

2. Ignition Switch Testing:

   • Disconnect the ignition switch connector and test for continuity with a multimeter.
   • Replace the ignition switch if it is not functioning properly.