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5-Series (E12,E28, E34, E39, E60) Chat relating to the BMW 5-Series of all generations. Specific models include: BMW 518, BMW 520, BMW 520i, BMW 530i, BMW 528i, BMW 530i, BMW 518i, BMW 524d, BMW 525i, BMW 525e, BMW 528e, BMW 540i, BMW 535i, BMW 520d, BMW 525td, BMW 525d, BMW 530d, BMW 525i/xi, BMW 530i/xi. (BMW 5-Series Forum)

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Old 06-14-2013, 09:58 AM   #1 (permalink)
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My ASC Light Won't turn off

Hi all,

I am new to BMW and to this forum. I have a 1997 BMW 528i has 110,000 miles on it. It runs perfectly, the only drawback was I recently had to replace the alternator and battery. The day after these were replaced, I drove it home and all was well. Now, the ASC light has turned on and will not go off. I am not familiar with this engine, but am willing to learn. I have read some threads saying that a broken cable could be the culprit, can anyone else shed some light on this situation? I am willing to try the repairs myself if it is nothing too invasive.

Please help!
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Old 06-14-2013, 10:29 AM   #2 (permalink)
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Welcome to Bimmerwerkz.

First double check all the wiring for the battery and alternator and your ground connections. Then I would check all your fuses to make sure they havent blown. After that, if all the connections and fuses look good, I would replace your ASC relay in the fuse box. Mine is orange and says "ASC" in white lettering on it. Yours may be different. When my ABS light was on for a bit, replacing the relay fixed it. They do wear out eventually.
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Old 06-14-2013, 10:56 AM   #3 (permalink)
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I will check that and let you know, thank you for the advice!
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Old 06-17-2013, 07:32 PM   #4 (permalink)
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So, the fuses are all fine, light is still on. I've read some stuff about cleaning the speed sensors or some sensor in the wheel well, any thoughts? Gas mileage is ok, took a trip this weekend and its still giving me what I had pre light
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Old 06-20-2013, 12:11 PM   #5 (permalink)
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What about the relay? Did you replace that? I replaced my relay and the light disappeared.
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Old 06-20-2013, 12:22 PM   #6 (permalink)
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What is the relay, and how would I check it?
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Old 06-20-2013, 12:32 PM   #7 (permalink)
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In the fuse box their should be a pink relay. Thats the ABS/ASC relay. If you have a multimeter you can test it, otherwise just replace it. Their not very expensive.

If that fails to solve it, give this a read:
HELP! ASC ABS Problem E39 523i
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