Just checked my 2006 X5, @StephenVA is correct.

I have 3 pumps, standing in front of engine from front to rear arrangement:

- The very FRONT pump is for HL (for which I disabled on purpose).
- Middle pump ---> front windshield
- Rear pump ---> rear tailgate

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1998 E39 528i 5sp MT
2006 E53 X5 3.0 6sp MT