There are 2 washer pumps: One for the windshield and one for the headlights. The one for the headlights is the one towards the fender I believe. The '96s (and perhaps others) had a recall for a problem with the headlight wiper/washer system. If one of the wipers gets stuck (while operating), the washer motor runs continuously, pumping out the reservoir contents until dry and then eventually burns up. This actually happended to me last fall, but when I contacted MB USA they would not honor the recall because they said it was too old. Nice touch.

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1996 SL320 97K miles
1996 C220 130k miles
1992 500SEL 170k miles <---sold
1986 300E 216k miles <---sold