To check the direction indicators, you need to turn on the ignition and turn off the hazard warning lights, since they block the direction indicators. When the steering column stalk is moved to the appropriate position, the direction indicators on one side and the green indicator lamp in the instrument cluster should begin to light at equal intervals. The operation of the signaling device is organized in such a way that, in accordance with the prescribed standards, the emergency signaling also works when the ignition is off - voltage is supplied to the switch directly from the battery. The direction indicators are supplied with electrical power only when the ignition is on via the installed fuse. If you experience problems with your system, the following recommendations may be helpful:
- if the indicator lamp stops working normally or flashes, usually one of the system lamps is faulty;
- if the lights stop flashing and remain on continuously, the device relay is faulty;
- if the lamps blink faster and then slower, and the wiring, including the ground wire, is not damaged, the relay must be replaced;
- if the turn signals do not work when turned on, but start working when the hazard warning lights are turned on, the fuse has blown, the turn signal switch or its wiring is faulty;
- if neither the turn signals nor the hazard warning lights work, then the relay is faulty. In addition to the control lamp, which flashes in the same rhythm as the indicator lamps, the activation of the system is also confirmed by an acoustic signal - clicks emitted by a relay in the instrument panel. If it is faulty, it is necessary to disassemble the instrument panel, which is quite labor-intensive.
Front and rear direction indicators
(Original material on the website: «MercedesMan»)
Removal and installation of direction indicators is described in subsections about headlights and taillights.