Testing Procedure

Wherever possible, battery should not be disconnected or defect codes stored in all the control units will be deleted. Disconnect control units from the wire harness only when ignition is switched off. Conduct wire tests only with the control unit or component connectors disconnected. The BMW universal adapter should be used for testing DME control unit or engine wire harness. The BMW universal adapter should only be connected between the control unit and wire harness when no diagnostic procedure (diagnostic connector not connected) is to be carried out since this can lead to malfunctions. Use only suitable test leads, terminals and probe tips.