Mercedes Repair Questions? Ask a Mechanic for Answers ASAP
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.