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The relay is stuck. Access your fuse/relay box and look for a relay labeled as heater or blower motor. Remove the relay.the fan should turn off if you have the correct one. Use a test light to check for power. You should have power at only 1 terminal when the fan switch is off. If so, then replace the relay. If there is power at 2 terminals then the switch or wiring is shorted.
I had a similar problem once with an Audi. I found that the relay in that case was in a plastic box about 5" x 7" under the hood. At first, I did not even realize it was able to be opened then a friend popped it open and there were several relays,( in my case the fuel pump relay) and switches inside.
You might look for a similar situation. Seems the Germans have a habit of hiding things in plain sight. Hope it helps.
Could be a number of things. Start with the fuel pump relay. When your key is in the start/crank pos. it overides the relay as soon as you release the key to run possition the relay has to stay ingaged or the fuel pump will shut off. Also look in your owners manuel for impact or emergency fuel shut off switch reset.
Check out your main lights relay and the associated fuse. If you have someone switch the lights on whilst your under the hood you should be able to hear the relay 'click' as the contacts are brought together. If the relay is dead check that when the switch is turned on that power is getting through to the relay. If the relay is clicking check that power is coming out of the Switched circuit. Now check the fuse, note this will only carry power if the dashboard switch is on and the relay is functioning. Check your bulbs
I'm no expert, just a tinkerer, but I recently had the same problem with a couple of window switches and emergency flasher. I replaced the switches. It was cheap a easy. I got the switches from autohausAZ for about $30 each (local Benz dealer wanted $180, NAPA wanted $50 but were out). Carefully slip a thin but sturdy blade beneath the tab at one end of the switch (about 1/8inch) and then the same with the other--a bent spring clip holds the switch in. Once you've got the clips loose, the switch pulls right out.
There are actually 3 behind the battery and the fire wall.
1- Fuel relay switch.
2- AC relay control switch.
3- OVP Over voltage protection relay switch.
They all have labels. To replace, just pull them upward. To have an easy access, remove the ECM unit blocking access first, then put it back after you replace the relay switch.
Most likely cause is the 'stop lamp switch'
It is a electric switch located on the brake pedal inside the car, about half way up on the brake pedal.
Pretty cheap too, I think the switch is only like $25 bucks.
2 connectors on the switch and then it turns out.
hope that helps
Fan relay should be in black box near frewall
Lift the hood. Just below the screen, opposite side from battery, you'll see a plastic cover shielding the engine management, abs control box etc. If you search around there after removing the shield/ cover you will find a relay with a fuse plugged into the top of it. This is the pump / system relay.