Hello,10 volts is definitely too low, the battery needs to be charged first of all. If the starter will work after charging current draw must be checked- possibly some lights inside stayed on or there is a faulty electronic component or rubbed through wires.If there is no Start-error message in instrument cluster and battery is fully charged- most likely the starter itself has failed.
Hello Stan,The battery was fine when the problem occurred. It had dropped to 10v after a lot of time with the ignition on. No message at all on instrument cluster except all ingnition & warning lights come on as normal when key is first position. Starter & solenoid bench tests fine. No click from solenoid when on vehicle. Need to check if immobiliser is the problem. How do I do this?
Click here for the starter wiring diagram
If the immobilizer is active, usually there is a start error message in LCD display
Immobilizer can be properly checked with Star Diagnosis computer, as it is a communication between the 2 control units.
Using this diagram, you can check the starter actuation circuit from ignition switch to starter 50th terminal.