Unnlocking test functions:

• Call up test #19 - This is automatically done if attempting to enter a locked test
• Using the trip meter reset button enter by pressing the sum of the last 5 digits of the chassis number, example  : VIN GB11111, -1+1+1+1+1=5, press the reset button 5 times.
• Confirm entry by pressing the CC button.

The test function can be cancelled by switching the ignition off or pressing the CC button for approximately 2 sec.