AMP2 / U2155 1F
Read the instructions below then 
start the fault diagnostic procedure.
Symptom: Intermittent amplifier function.
	
O-buss. Intermittent Open Circuit before Control Module

Fault symptom
Intermittent amplifier function.
On-board diagnosis
Type of diagnosis:
Enable criteria:
| All modes except starter motor cranking | 
Fault criteria:
| No contact with one, several or all O-bus systems. | 
System reaction to a fault:
| Intermittent amplifier function. | 
Diagnostic help
Diagnosis regards:
| Electrical fault on bus leads or in the component. |