HeadingControl unit

FaultIncorrect or unreliable data.

CauseThe fault may be due to:

 

1. Internal fault in the control unit.

2. There is an external current consumer on U15 (ignition voltage) when starting.

3. U15 supply from the control unit during shutdown, either via bodywork or another control unit.

NotesDepending on the above fault, the following will occur:

 

1. The control unit will not switch off in spite of repeated attempts to do so as long as the fault is active.

2. It takes a long time to start the control unit.

3. The control unit will not switch off in spite of repeated attempts to do so as long as the fault is active.

ActionCheck whether there is a high current consumer on U15.

Check whether the control unit is receiving a supply from any bodywork.

Check the electrical cables.

Clear the fault code memory and take the vehicle on a road test for 10 minutes. Check whether the fault code has been generated again. If the fault code has recurred, renew the control unit.