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I cannot offer you any more info as I do not have a 300SD. The problem is electrical. Has it ever worked before? The trunk lock/passenger door connector probably were disconnected at the pod. The yellow line should be the sensing line so I do not understand why the blue toggles. It may have been swapped.
There is one last thing you can try. Remove the plug and measure the pins at the pump connector.
1) Determine which Pin is at constant 12v.
2) Determine which Pin is chassis.
3) Determine which Pin is floating - this is the sensing line.
4) Ground the sense line and see what happens to the pump.
5) Put 12v to the sense line and see what happens to the pump. It may be better to put a 1K resister ( a light bulb may be possible ) in series just in case something blow up.
This is the end of the line for me to help you. Good luck.
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