Manual activation of retarder
â–¶ How to fix
Check the retarder lever or the retarder-Opticruise lever including cable harness and connectors.
What you'll see
No driver-visible symptom recorded.
System reaction
No system-reaction text recorded.
Diagnostic depth
Detection
The voltage in the retarder lever or retarder-Opticruise lever circuit has been above the permitted level.
Possible cause
The fault may be due to: Short circuit to voltage or open circuit. Faulty retarder lever or retarder-Opticruise lever.