Wiper Relay connector questions, wires, pin out voltages etc.
Ok, I hate to be someone posting this kind of question, but here we are.
I had my Ebox drain clog and have been getting water in there for sometime, the wipers would either not work or not turn off the last year or so, the other day they died.
First all 3 fuses were checked, 2 in front and 1 in rear. They were all swapped with known working ones for good measure.
No wipers.
Then I pulled the DMEs and confirmed moisture, my drain was clogged with cypress needles, from the tree it was parked under for a month literally 3yrs ago.
Confirmed Wiper Relay 1 & 2 were heavily corroded and mild burning on the plastic connectors. Then found 2 broken wires on each the very small ones on both.
Brown/Blue
Brown/White
Red/Yellow squares
Brown/Blue
Both purple relays were severely corroded.
I went to junkyard and got lucky with an E39, two purple relays! I cut the connectors and harnesses out. I used my BMW electrical tool kit to remove the pins with good wire in the same color from the donor plugs, then I removed the old broken pins from the damaged connectors in my car, soldered the new wire pins to old wires and re inserted them, hopefully correctly.
On wiper Relay 1 I am getting this from the pins.
87 - 12v
87a - Ground
86 - 12V (Small wire that was repaired)
85 - Nothing, just mili volts
30 - Nothing, just mili volts
Wiper Relay 2
87 - Ground
87a- Ground
86 - 12V (Small wire that was repaired
85 - Nothing, just mili volts
30 - Nothing, just mili volts
Results have been the same with car off and with key on, engaging the wiper stalk doesn't seem to change it.
I did check and swap the fuses again after first trying the new relays.
I would like to get confirmation on jumping to eliminate the used, but good shape relays and if anyone knows the readings I should be getting so I can confirm my stalk works.
Its an 11/95 750iL. I have access to an '01 740iL if need be, RealOEM seems to think it also has the dual relays, but I'm not sure I trust it.
Any help is appreciated.
Present:
'96 750iL (Project)
'95 C1500 350 V8
'03 540i M Sport AT
'22 GMC Sierra 1500 DD
'92 Olds Toronado Trofeo (Project)
Past:
'93 325is (Parted)
'95 840Ci (Sold)
'86 735i (Parted)
'02 Z3 3.0i (Sold)
'09 328i (Leased)
'91 750iL (Parted)
'00 Z3 2.5i (Sold)
'86 944 NA AT (Sold)
'84 633 CSi (Sold)
'06 X3 3.0 (Sold)
'20 M2:Competition 6spd (Sold)
Bookmarks