Mercedes Repair Questions? Ask a Mechanic for Answers ASAP
Hi, fuse 52 in the driver's side fuse box under the hood is for the starter motor. I'd start by checking that fuse to see if it has blown.
If the fuse is blown it indicates a bad starter. If the fuse is good you need to test the fuse for 12V when the key is turned to the start position.
If you have 12V to the fuse and the starter doesn't turn the motor the starter is probably bad or there is a fault between the fuse and the starter. If you don't have 12V to the fuse there is a fault with the start authorization circuit which consists of the gearshift, transmission control unit, engine control module, ignition switch and front SAM. You will need to get the car connected to a Mercedes diagnostic tester to check the actual values of those items.
Let me know if you have any questions.
This is where it gets complicated. There are a lot of things that affect the signal to the starter fuse. You really need to get the car connected to the Mercedes tester to view the actual values of the shifter, transmission, ignition switch and the terminal 50 signal to the starter. The starter relay is right next to fuse 52 at position S in the fuse and relay box. You can swap out the relay but if that doesn't help you will need to get the car connected to the Mercedes Star Diagnosis tester to troubleshoot the starter circuit. A faulty park contact in the shifter or in the transmission or a faulty transmission control module or ignition switch or SAM are some of the possibilities.
Let me know if you need anything else.
There is no reset but you might have damaged the transmission linkage. I'd have the linkage inspected to see if it got bent or came loose. If the transmission is not fully in park it would cause the problem.
Will the car roll in neutral?
Hi, I'm just following up with you on this question. Do you need anymore help with this?