well it does say that the white/black bottom ones are not interchangeable...

to see if the pump does work try applying a positive or negative signal to one of the prongs... this should trigger the pump.

Not quite sure how it all works but i think the input signals from all 3 prongs have to "somehow" match for the pump to run...(i think) so if one of the contacts on one of the actuators gets stuck, sending a constant signal (+/-)... the pump won't run. at least that's how i understand it.

i did a workaround for this. i simply installed a keyless/alarm system... and eliminated the need for the contacts in the actuators... i disconnected them and wired one prong (IIRC) to receive a signal from the alarm ECU via a few relays.

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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