Mercedes-Benz W202 indicators and wipers do not work – multifunction relay
Mercedes-Benz W202 indicators, hazard lights and wipers stop working – what is the fault?
A common cause is the multifunction relay, which controls the indicators, wipers and rear window heating. Solder joints on its circuit board crack. Resoldering alone fixes the fault only sometimes, and a new relay is the sure solution.
Where is the Mercedes-Benz W202 multifunction relay and how do I get it out?
The relay is a black part about 15 cm long behind or under the fuse box. The cover comes off by undoing a few Phillips screws. The relay comes out by lifting and rocking it alternately from both ends. The exact location varies from car to car.
Why does the Mercedes-Benz W202 indicator blink at double speed?
A doubled blink rate usually means that one indicator bulb has blown or is not getting power. First check the bulbs of all indicators, especially the rear ones, and if needed also the earth at the base of the light.
What else should I check before replacing the relay?
Check the fuses, including the boot fuse box if the fault began after a towbar was wired in. Indicators and wipers can also misbehave because of intermittently breaking wires in the multifunction stalk. Also press the relay in place to see whether the symptoms change.