Why do I hear a clicking noise when starting my 2020 Highlander?

Problem Diagnosis: Clicking Noise When Starting a 2020 Toyota Highlander

Possible Causes

1. Weak Battery: Insufficient voltage to start the engine.
2. Bad Starter Motor: Starter may be failing or faulty.
3. Corroded or Loose Battery Connections: Poor electrical connections can affect starting.
4. Faulty Ignition Switch: Issues with the ignition system can prevent starting.
5. Electrical Issues: Problems with wiring or fuses.

Tools Required

• Digital multimeter
• Battery terminal cleaner
• Wrench set (for battery terminals)
• Jumper cables (for jump-starting)
• OBD-II scanner (optional, for advanced diagnostics)

Step 1: Check Battery Voltage

1. Turn Off All Accessories: Ensure the vehicle is completely off.
2. Test Battery Voltage:
   • Set your multimeter to DC voltage.
   • Connect the red probe to the positive terminal and the black probe to the negative terminal.
   • A healthy battery should read between 12.4V and 12.7V. If the reading is below 12.4V, the battery may be weak.

Step 2: Inspect Battery Connections

1. Visual Inspection:
   • Check battery terminals for corrosion (white or green powdery substance).
   • Ensure the connections are tight.
2. Clean Terminals:
   • If corrosion is present, use a battery terminal cleaner or a wire brush to clean the terminals.
   • Reconnect and ensure they are tight.

Step 3: Jump Start the Vehicle

1. Using Jumper Cables:
   • Connect the red cable to the positive terminal of the dead battery and the other end to the positive terminal of a good battery.
   • Connect the black cable to the negative terminal of the good battery and the other end to an unpainted metal surface on the dead vehicle.
   • Start the vehicle with the good battery. If the Highlander starts, the battery may need replacement.

Step 4: Check the Starter Motor

1. Locate the Starter: It is usually found near the transmission at the engine's bottom.
2. Tap the Starter:
   • Lightly tap the starter motor with a hammer or wrench while someone else attempts to start the car. Sometimes, a stuck starter can free up this way.
3. Test the Starter:
   • If tapping doesn’t work, you may need to test the starter with a multimeter or replace it if it fails.

Step 5: Inspect the Ignition Switch

1. Turn the Key: When you turn the key, listen for any clicks from the ignition switch.
2. Test with OBD-II Scanner:
   • If you have the capability, connect an OBD-II scanner to check for any related trouble codes that may indicate an ignition system fault.

Step 6: Check Fuses and Wiring

1. Inspect Fuses: Locate the fuse box (consult your owner's manual) and check for any blown fuses related to the starting system.
2. Wiring Inspection: Look for any damaged or frayed wires leading to the starter and battery.

Repair Instructions

1. Battery Replacement:

   • If the battery is weak, replace it. Remove the old battery by loosening the terminal bolts (negative first, then positive), and install the new battery in reverse order. Ensure all connections are tight.

2. Starter Replacement:

   • If the starter is faulty, disconnect the negative battery terminal.
   • Remove the starter by unscrewing the mounting bolts and disconnecting the wiring harness.
   • Install the new starter by reversing the removal steps.

3. Ignition Switch Replacement:

   • If the ignition switch is faulty, it may require disassembly of the steering column. Consult the service manual for specific procedures.

4. Repair Wiring:

   • Any damaged wires should be repaired or replaced to ensure proper current flow.

Conclusion

After performing these diagnostic steps and repairs, start the vehicle again. If the clicking noise persists despite everything being in order, further diagnostic work may be necessary to explore deeper electrical issues.