Vauxhall Zafira starter tries to engage while the engine is running, tried a new relay but still happening

Could be a worn / faulty ignition switch but there was a TIS (Technical Information Software) on this problem also .


Zafira starter motor staying on

Voltage management, voltage supply, ignition lock
The CIM control unit is responsible for voltage management within the vehicle.
It is responsible for decoding the ignition lock information (ignition key position)
and for forwarding this information as CAN information to the rest of the vehicle.
In addition, the CIM actuates, by hard wiring, two power supply relays in the UEC and REC. The ACC (ignition lock position 1) signal is also transmitted by hard wire to the ECM to power it up more quickly. The engine will fire more quickly as a result.



Starter control function
If the CIM detects the "engine start" ignition key position, it sends a CAN message to the ECM to actuate the starter. After receiving this message, the ECM sends another bus message to the UEC via the CIM interface.
The UEC then actuates the starter relay incorporated in it.
Direct actuation of the start relay by the CIM without the "diversion" via the ECM would not be sensible as the ECM decides whether the starter should be actuated (if the engine is already running, the ECM will not send a bus message to the UEC to actuate the starter, even if the driver has turned the key to the "Start" position).