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7 Series - E23 / E32 (1977 - 1994)

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Old 06-17-2014, 11:34 AM
rwild1967 rwild1967 is offline
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Location: Wichita, KS
Join Date: Jun 2014
Posts: 6
Mein Auto: 1990 750il
Just got a 1990 750il and a few questions?

OK, The ASC switch, I know what it's supposed to do, How do I know if it's doing it? Pressing the switch doesn't light anything on the dash, and doesn't seem to make any drive-ability difference.

Next, the a/m switch next to the shifter. in "a" everything seem normal, but in "m" I cannot access 4th. 1,2, and 3 all seem normal but when I go to "d" it never upshifts. Also the switch will take me from "a" to "m" but not back. I have to shut the car off to get back to "a" and I'm guessing that's not right.

Anybody know where to start?
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Old 06-17-2014, 03:49 PM
fidolido fidolido is offline
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Location: Los Angeles, CA
Join Date: Jan 2011
Posts: 23
Mein Auto: 93 525i E34
The ASC (Automatic Stability Control) usually works in slippery roads and such. There should be a light for it either on the center console or the dash. Could be a burned out bulb. Easy way to check is to insert key into position 2 and check the lights on the dash. If you see an ASC light, then the module may not be working. The A/M switch usually in M allows for lower shift points so that the car has better acceleration for speed. If you can't move it to the A position, could be the tranny module has a fault. But in M mode, it is correct in it's gear selection of 1, 2, 3.
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Old 06-25-2014, 12:03 PM
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BMWFatherFigure BMWFatherFigure is offline
Old School
Location: Perth, Western Australia
Join Date: Aug 2012
Posts: 2,171
Mein Auto: E23;E30;E38;E32;E34 +
Is the revert to 'A' by pushing down on the switch rather than sliding it?
Good - Fast - Cheap: Pick any two.
E23 735i; E32 735iL (X 2 - 1 Alpine White and 1 Glacier Blue); E34 535i; E38 735iL; R50 Cooper; R55 Cooper Clubman.
E21 318i; E30 318i; E32 735iL; E34 535i; E38 730iL; E53 4.4i
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