Quote:
Originally Posted by Mxfrank
The aux pump is internally shorted, this is a common problem. There's an automatic circuit breaker inside the head unit that turns off everything when this is detected. Either replace the aux pump, or leave it disconnected.
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I have disconnected the aux pump and put the connector on a 12v light source and the same problem occurs. If I use another ground wire that is constantly grounded then the aux pump works fine, but it is constantly running. I am unable to trace any short to the white/brown wire that connects to the aux pump and goes to pin#7 on the push button unit. Is there a relay or fuse for the aux pump because I can't find any. In fact, I have run other issues that aren't related to this one in particular, but I have the FSM for my 1990 190E 2.6 and I have noticed that my car has factory wires/connections that I can not even locate on the FSM. I have a friend with a 92 190E 2.6 and even noticed that there are very slight deviations in some of the factory wiring that I can see on the FSM for his car, but no mention of anything on my car. Ex: There is a white wire that is on the left connector on pin#9 I believe on the push button unit, but nowhere on any part of the FSM is that wire listed for any model from 1987 - 1992.