STAR Test Mode beep

What does STAR Test Mode mean?

A beep sound accompanies each time the STO (Self-Test Output) signal goes low during the STAR Test Mode. This indicates the scan tool is receiving a signal related to the vehicle's self-test.

• The vehicle is undergoing a self-test procedure.
• The STO signal is being actively monitored.

Click steps to track your progress.

1. 1

   Listen for the beeps to confirm the test is progressing.

2. 2

   Write down any 2-digit or 3-digit codes displayed on the screen.

3. 3

   Refer to the vehicle's service manual for interpretation of STAR Test Mode results.

4. 4

   Ensure the STI (Self-Test Input) is in the correct state for the test.