Tachograph button kit
â–¶ How to fix
Check that buttons have not stuck in the depressed position. Try to reset the function. If the fault cannot be rectified, or if it recurs, renew the tachograph.
What you'll see
No driver-visible symptom recorded.
System reaction
No system-reaction text recorded.
Diagnostic depth
Detection
The tachograph button kit has given a constant signal.
Possible cause
One of the buttons has been pressed for more than 6 minutes or has become stuck in the depressed position.