Reversing lights not working

Follow the given link, maybe you get something useful. Hyundai Excel

That would depend on the make , model an year vehicle !

Typically, reverse light switches are located under the dashboard. They work like a refrigerator light switch that is pushed in when the door is closed and as soon as the button is allowed to come out the light comes on.
In a car, the same kind of switch is operated by the upper end of the brake pedal arm up under the dashboard.
Check your fuses also. They're more likely to go than the switch.

could you be talking about the backup lights? I have never seen rear fog lights on a car and I have had a bunch of them. With help, set the emergence brake and have someone start the car and place the shift in to reverse, be sure you are not standing right behind the car. see if the lights you are talking about light then. Remember have the person put thier foot on the brake while dooing this.

Could you be talking about the backup lights? I have never seen rear fog lights on a car and I have had a bunch of them. With help, set the emergence brake and have someone start the car and place the shift in to reverse, be sure you are not standing right behind the car. see if the lights you are talking about light then. Remember have the person put thier foot on the brakes.

should be around gear lever or switch on gearbox or transmission

i could be that the reverse belt has droped or broken

solution???... don't call your mercedes a Huundai Excel... then maybe you'll get results.. .ya think?

Check the reverse light switch on the gear box

It appears you have a Forward Clutch FAILURE. Replace the trans after you get it diagnosed and verified by a professional technician. By the way, do you have a Check Engine light? If so, what is the diagnostic code? The dealership can scan the system and find any codes which may have been stored in the TCM (Transmission Control Module). If there were any 'Incorrect Gear Ratio" codes, it's most probably the trans itself.