Left signal light not working. Bulb has been replaced and fuse checked. what could be the issue.
Check for burnt or cut wires. also look for corrosion or any melting or browning where the bulb plugs in or in any connections.
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Could be a problem w/turn signal switch. One fairly easy test, ask your shop to check the voltage on wire powering the bulb. If zero volts all the time, switch on or off, you know at least the problem is occurring before the bulb. Also look for black ground wire in vicinity of bulb fixture. Is it making clean contact w/chassis?
Our 39th Smart car question ever.
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Don’t encourage them 
The SAM may have failed.
SAM stands for Signal Acquisition Module. A SAM module (also called Signal Actuation Module) receives data from sensors, switches, and controllers, and can send data, actuate (activate) components and monitor systems. Mercedes-Benz has been using SAM modules since the mid-90s.
It controls everything electrical in the car. Such as turn signals.
Tester
A Corroded ground connection is my go to for things like this.
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With the bulb out, it would have been a good idea to use a test light or voltmeter and verify whether or not voltage was present at one of the terminal contacts.
The multimeter could have also been used to verify a good ground lead and to even check the old bulb to make sure it was bad before replacing it.
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