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- 2008 Mazda5 GT
Are you saying you DON'T have the wiring harness connected to the cap and that you ONLY have the cap??Read your previous post before the edit. There was no wiring harness attached, and I didn't see any dangling around. Additionally, the connector on this unit has road grit in it, so I don't think it was ever connected to anything. This diagram shows a low-level switch in a different location on the reservoir.
Maybe this would have been some sort of relay? The side opposite the connection point, with the two round circles, looks like a terminal end, though. The circles are two soft rubber caps.
No engine codes or warning lights yet. Hope it stays that way. I'll be happy if this is some vestigial part.

Nice find on the diagram! This confirms there is an optional sensor avail. The jump test may be valid after all. Be fun to see a new light pop up

76673
SWITCH, LEVEL
F.WASHER TANK-LARGE. Required: 001.
$33.47