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3-Series (E36) Chat relating to the BMW 3-Series from 1992-1999. Autodoodad Specific models include: BMW 316i, BMW 318i, BMW 318iS/ti, BMW 320, BMW 323, BMW 320, BMW 324, BMW 325, BMW 328.

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Old 12-18-2011, 05:29 PM   #1 (permalink)
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New pads and sensors- light still on

Daughters 1995 325 had the brake pad warnning light come on. Replaced all pads and 2 wear sensors but warning light is still on. Disconnected both new sensors and light is still on. Anyone else ever have this? It is obviously not the new sensors but it is such a simple system I cant understand what I may be missing. Help me out gang.
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Old 12-22-2011, 06:14 PM   #2 (permalink)
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mine does that,the light goes off after a few miles,well more than a few.suspect you need some cunning bmw tool if you want lights out right off.if not just wait they will go out.Failing this ask dabsy the font of all knowledge and star in a reasonably priced BMW.some say he washes in fully synthetic stella artois.
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Old 12-23-2011, 03:22 PM   #3 (permalink)
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Quote:
Originally Posted by jimmythepie View Post
mine does that,the light goes off after a few miles,well more than a few.suspect you need some cunning bmw tool if you want lights out right off.if not just wait they will go out.Failing this ask dabsy the font of all knowledge and star in a reasonably priced BMW.some say he washes in fully synthetic stella artois.
What are you like Jimmy? LOL

Two choices...
1 - Clean the sensors
2 - Replace them, not that expensive...

BTW, Some say, I clean my teeth with the same solution as cleaning car parts (Isopropyl), AND that I can control a TEENAGER just with my left eye... ALL I know is that I AM THE STIG...
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Old 12-31-2011, 07:28 PM   #4 (permalink)
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Some bimmers like it when

Some of the newer car like you to turn the key on all the way without cranking the engine and let is sit for more then 30 secs the turn off then start the car
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Old 01-03-2012, 03:31 PM   #5 (permalink)
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Well gang, spent some time with this thing to no avail. Unless I am missing something this is a pretty simple system. The brake sensors ground to the rotors and turn on the dash light. I unplugged both wear sensors and the light stayed on. I read about the KOEO step but the light stayed on no matter how long I left the key on. Disconnected the battery for a few hours while I replaced the oil filter housing to block seal and half expected that to reset the control computer buy no good there either. I know the brakes are fine so the warning light is just annoying at this point but I want to get it to turn off. There must be someone who had had this before. I hope they come across this post and offer some magic.
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Old 01-03-2012, 03:36 PM   #6 (permalink)
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Can you access the Dash/Comp reset?
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Old 01-03-2012, 03:44 PM   #7 (permalink)
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Please explain what you mean by access
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Old 01-04-2012, 02:41 PM   #8 (permalink)
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Just have a quick look here...
BMW 328iC E36 OBC

How about physically resetting the Services by "jumping" pins 7 and 19 at the diag socket under the hood?
Something's got to give eh?
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Old 01-05-2012, 11:46 AM   #9 (permalink)
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Very interesting article on the features of the computer. However, i do not see anything relative to the brake pad warning light.. Please pass on additional information. I think I have a bad wear sensor. When I have time I am going to bypass the wear sensors and see if that works.
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Old 01-05-2012, 02:36 PM   #10 (permalink)
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After looking at the wiring schematic for the brake pad sensor circuit I think I have it figured out. The two wire system sends 12v through one wire to the sensor which grounds through the second wire back to the dash light. When the pads wear, the closed circuit is opened and the light comes on. I have either a bad (open) new sensor or I may have bent either of the two pins in the connector. Either way I have an open in one or both of the sensor circuits. I will bypass each sensor individually to find out which one is open. BMW specifies a voltage check on the 12v wire and a continuity check to ground on the other so now that I know how the system works I should be able to isolate the problem.
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Old 01-05-2012, 03:10 PM   #11 (permalink)
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Good idea, remember not to use the sensor ground wire, eh?
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Old 01-07-2012, 06:23 PM   #12 (permalink)
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Well it was just as I thought. One of the tiny little wires on the wear sensor pushed out when I connected it up. Pulled it off today and saw the problem right away. Pushed the pin back in and the light went right off.
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Old 01-08-2012, 07:40 AM   #13 (permalink)
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Excellent result mate... Well done ;-)
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