Date registered: Jul 2012
Vehicle: W140 S280 1996 P
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S280 Door Mirrors repair
This may be an old thread, however I have recently had problems with my door mirrors not working. I would like to share with you how I fixed mine.
If you have an w140 s280 with memory seats, you also have memory mirrors. As you all may know these are controlled by a unit in the pasenger footwell. If your s280 does not have memory seats life is a lot simpler and fixing your faulty mirrors should be easy.. (ish). In both cases try my suggestions.
If both your mirrors stop working all of a sudden and you find there are no blown fuses, you need to check the mirror adjust switch unit. Remove the switch from the console and first check you have 12v to the switch. You should find 12v on the row of three connection points on the switch connector. If you find 12v - good. Now meter out the switch unit taking note of which pin should be 12v feed. Connect one lead of a continuity meter/tester to this pin and the other lead to each of the other pins inturn while opperating the switch. You should get some conductivity from the switch.
If you get nothing, then your switch is faulty. Now you can either buy a new one or repair / have repaired the old one. The fault will most likely be a melted track on the switches internal PCB. The switch comes apart quite easily but be sure to note where everthing comes from for reassembly.
Carefully desolder and remove the PCB as the blown track is on the under side. The track can be repaired by soldering a piece of thin solid wire across the track. Note you will need to remove a thin section of the switch housing so the PCB still sits flush on it. Reassemble your switch and Voilà your mirrors should now work. One more thing to check.. the reason the switch burnt out in the first place is most likely because of a short in one of the mirrors. You will need to check this also before you refit the switch, this is a common fault on these cars where the insulation wears away over time.
If you have memory seats and both mirrors stop working, but the seats still "fully" work then check the adjust switch first. If you find no fault with the switch look to the control module in the passenger footwell. Again this should be repairable but as my car does not have the memory function I can't tell you where to look.
Don't be afraid of taking faulty parts to bits and looking for a repair solution. If you need a new part anyway there is no harm what so ever in having a go at fixing the old one yourself. It could just save you hundreds of pounds.
I hope this helps someone fix there mirror faults.