95 S280

My wiper only functions with speed setting "2". Doesn't respond with positions 1,3.

I opened up the wiper relay... I don't think the relay contacts are the problem... aside from being "clean"... only one relay "clicks" which leads me to believe that the problem lies BEFORE the relay. (technically 2 relays work, the green one clicks as soon as I turn the key)

I have dismantled the combination switch, isolated the 4 wires/pins at the stalk that control the wiper. 3 colored wires, which I'm assuming are for the 3 speed settings... and a black wire that shares itself with a bigger black wire which I assume is ground.

Connecting each of the colored wires to the black wire only one gets continuity, in speed setting #2... coincidentally, on setting #2...testing continuity across all 3 colored pins yields continuity. Does this mean my combi switch is toast?

To make matters more confusing... I decided to bypass the combi switch and "short" the wires on the corresponding connector... same result!!!!! The wiper motor turns only when connecting the pins which respond to speed setting #2!!! (black wire and one of the colored wires)...

What controls the intermitent and full speed settings? Just the wiper relay? As far as I can tell it looks brand new inside... and if it were the contacts... the relays should at least "click"... but not all of them do.

Any theories? Is there another "brain/module" that controls the wiper speeds?

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85 190E 2.3(SOLD)
86 230E (-->300D) sold
87 300D (-->300TD) sold
68 250S w/ a 615 and manual tranny (RIP)
87 300TD (SOLD)
95 S280 "The KRAKEN" (Turbo 2.9 602 transplant) traded
86 190E 2.3... current project