The rotary knob for adjusting the volume is not functioning | T72 series | Settings video | ISUDAR

Step: 1. Any one of KEY1 or KEY2 is grounded, 2. Enter the steering wheel to learn 3. Click Start 4. Click volume , click End 5. Adjust the knob to see if the knob works. 6. After the knob can work normally. KEY1 or KEY2 disconnect the ground wire. 7. Enter the steering wheel, and clear the learnning content.