how to diagnose electrical problems in Tesla Model S Original (2012-2020)

Solution

1. Preparation

• Gather tools and components: Ensure you have an OBD-II scanner, multimeter, socket set, and replacement fuses or battery if needed.
• Safety first: Disconnect the main battery pack before performing any repairs to prevent electrical shock or short circuits.

2. Inspect and Replace the 12V Battery

• Sub-steps:
  1. Locate the 12V battery under the front trunk.
  2. Disconnect the negative terminal first, followed by the positive terminal.
  3. Remove the battery hold-down bracket using a socket set.
  4. Lift the old battery out and replace it with a new one of the same specifications.
  5. Reconnect the positive terminal first, followed by the negative terminal.

3. Replace Blown Fuses

• Sub-steps:
  1. Access the fuse box located under the dashboard or in the front trunk area.
  2. Identify any blown fuses using a visual inspection or a multimeter.
  3. Remove the blown fuses using fuse pullers.
  4. Install new fuses with the same amperage rating.

4. Repair Damaged Wiring

• Sub-steps:
  1. Identify any damaged wiring or connectors during the visual inspection.
  2. Cut out damaged sections of wiring and strip the ends.
  3. Use heat shrink tubing or electrical tape to insulate splices securely.
  4. Reconnect wiring harnesses ensuring that all connections are tight and secure.

5. Test and Monitor Electrical Systems

• Sub-steps:
  1. Reconnect the negative terminal of the main battery pack.
  2. Use an OBD-II scanner to clear any DTCs and monitor the system.
  3. Perform a test drive to ensure all electrical components function properly.