The issue you're experiencing with the rear turn signal lamps and the speeded-up sound could be related to a few different factors. You can check Bulbs: Verify that the rear turn signal bulbs are functioning properly. It's possible that one or more bulbs are burned out. Replace any bulbs that are not working. Or examine the wiring and connections associated with the rear turn signal lamps. Look for any damaged or disconnected wires. Ensure that the bulbs are securely seated in their sockets.