PLEASE HELP! 500 sl power window

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Jeff Martin - 27 Mar 2005 17:08 GMT

Passenger side power window won't operate. It makes a quiet rattling sound
but wont move the window. Motor is fine (switched it to drivers side and it
works). Also when I bring 12 V to the motor leads with booster cables it
goes up and down fine. Mechanism is fine. Dash switch pulls in relay behind
passenger seat. Switched switches with driver side just to be sure. Fine.
Bottom limit switch working properly (checked with multimeter). Is there an
upper limit switch? I have 12V at black and green terminals mounted on door
but no movement. I'm thinking faulty ground but when I connect booster
cable from door directly to negative battery terminal it doesn't help. Any
ideas?

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Tiger - 27 Mar 2005 21:01 GMT

Are you sure it is not the relay?

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Jeff Martin - 27 Mar 2005 22:16 GMT

I dont think so because there are two separate relays, one for up and one
for down. each of them pulls in but neither works. I would suspect them if
the window would go up but not down or visa versa. Also, they are mounted
on a circuit board with about 12 other relays so it's tough to check beyond
a visual inspection and checking that the polarity does actually reverse at
the window when the switch is toggled. It seems OK.

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