my Volvo XC90 won't start and only clicks, what should I check

Solution

1. Preparation

• Gather tools: multimeter, socket set, jumper cables, and battery terminal cleaner.
• Ensure the vehicle is in a well-ventilated area and parked on a flat surface.
• Disconnect the negative battery cable to prevent electrical shorts.

2. Battery Inspection and Replacement

• Sub-step 1: Clean battery terminals using a battery terminal cleaner to remove corrosion.
• Sub-step 2: Reconnect the battery terminals securely.
• Sub-step 3: If the battery voltage is low or the load test fails, replace the battery:
  • Remove the battery hold-down clamp using a socket set.
  • Disconnect the positive terminal followed by the negative terminal.
  • Remove the old battery and install the new battery in reverse order, ensuring correct polarity.

3. Starter Motor Testing

• Sub-step 1: Locate the starter motor under the vehicle.
• Sub-step 2: Disconnect the wiring harness and the battery cable from the starter.
• Sub-step 3: Use a multimeter to check for voltage at the starter terminal when the ignition is turned on.
• Sub-step 4: If no voltage is present, trace back to the ignition switch and wiring.
• Sub-step 5: If voltage is present but the starter does not engage, replace the starter motor.