my Toyota Corolla E140 (2006-2013) has no power to accessories what should I check

Solution

1. Preparation

• Tools Required: Multimeter, fuse puller, socket set, wire brush (for cleaning terminals)
• Ensure the vehicle is turned off and the keys are removed from the ignition.

2. Battery Inspection

• Sub-steps:
  1. Use a multimeter to measure the battery voltage. Ensure it reads between 12.4 to 12.6 volts. If voltage is low, charge or replace the battery.
  2. Clean the battery terminals using a wire brush to remove corrosion.
  3. Tighten the battery terminals securely.

3. Fuse Check

• Sub-steps:
  1. Locate the fuse box in the cabin and the engine compartment.
  2. Identify accessory-related fuses (refer to the vehicle's manual for location).
  3. Use a fuse puller to remove and inspect each fuse. Replace any blown fuses with the same amperage rating.

4. Ignition Switch Testing

• Sub-steps:
  1. Access the ignition switch by removing the necessary trim pieces.
  2. Disconnect the ignition switch connector.
  3. Using a multimeter, check for continuity between the terminals when the key is turned to the "Start" position. If no continuity is found, replace the ignition switch.

5. Wiring Inspection

• Sub-steps:
  1. Visually inspect the wiring harnesses leading to the fuse box and ignition switch.
  2. Look for signs of fraying, cuts, or loose connections.
  3. Repair or replace damaged wiring as necessary.

6. Relay and Distribution Check

• Sub-steps:
  1. Locate the main power distribution relay under the hood.
  2. Check for any signs of burning or damage.
  3. Swap the relay with a similar one in the fuse box to test functionality.