Is it normal for the Mercedes-Benz turn signal not to work while the hazard lights are functioning?

[MacAxel]

It is abnormal for the Mercedes-Benz turn signal not to work while the hazard lights are functioning. Introduction to Turn Signals: Turn signals are important indicator lights that are activated when a motor vehicle turns to alert surrounding vehicles and pedestrians. The turn signal bulbs use xenon tubes, controlled by a microcontroller circuit, with left and right alternating flashes for continuous operation. Turn signals utilize flashers to achieve the blinking effect, which can be mainly categorized into three types: resistance wire type, capacitor type, and electronic type. Function and Usage Notes of Turn Signals: Turn signals are the primary devices indicating a vehicle's dynamic information, installed at the front and rear of the vehicle body. They are activated during turns to ensure driving safety. For the safety of yourself and others, please use turn signals as required to inform others of your vehicle's movement in advance, allowing them to make correct judgments.

[MaryAnn]

I've been driving for over a decade and encountered this exact situation with Mercedes vehicles. It's actually quite common for the turn signals to fail while the hazard lights work normally, which definitely indicates a problem. Since the hazard lights and turn signals use the same bulb, the fact that hazards work proves the bulb itself isn't faulty. The issue lies in the control circuit, particularly with the turn signal switch. The stalk beneath the Mercedes steering wheel often develops internal contact problems - I've seen many owners needing to replace the entire switch assembly because of this. Another possibility is a failed turn signal relay, which specifically controls turn signals but doesn't affect hazard lights. I'd recommend first checking the fuses - even though hazards work, turn signals might have a separate fuse. If you're not familiar with electrical systems, don't attempt repairs yourself; take it to a workshop for computer diagnostics - that's the most efficient solution.

[DominicDella]

My car had the exact same issue last year. At first, I thought it was a minor problem and didn't pay much attention, until one day when I almost got rear-ended while turning, which gave me quite a scare. Later, when I took it to the repair shop, the mechanic told me that the steering control module in Mercedes-Benz cars is most prone to failure. Although the hazard lights and turn signals share the same bulb, their control signals follow two separate paths. The turn signal switch is connected to a flasher module, which might have poor contact or be damaged. I also asked why the hazard lights worked fine, and the mechanic explained that the hazard warning light signal is directly connected to the body control module, bypassing the steering control circuit. Nowadays, repair shops have diagnostic computers that can pinpoint the fault by simply plugging in, so there's no need to guess which part is faulty.

[LaWalker]

My experience with Mercedes-Benz electrical repairs tells me that if the hazard lights are working normally, the bulbs themselves are fine. In this case, there's an 80-90% chance it's a faulty turn signal switch under the steering wheel. Over time, the switch contacts oxidize and turn black, preventing the signal from transmitting when turning. In rare cases, it could be a malfunctioning turn signal output on the body control module, which requires programming to match. The simplest method is to test if both left and right turn signals don't work. If only one side fails, it's likely poor internal contact in the switch. I recommend not continuing to drive and heading to a repair shop immediately. Mercedes-Benz wiring is complex, and DIY attempts can easily damage more components.