3-Series (E46, E90)Chat relating to the BMW 3-Series from 1999 to Current. Models include: BMW 316i, BMW 318i, BMW 318Ci, BMW 320i, BMW 323i, BMW 325i, BMW 330i, BMW 328 Ci, BMW 328i, BMW 325i/xi, BMW 330Ci, BMW 320d, BMW 330d, BMW 335d.
I bought my 318 2 months back (year 2000 model) and had a scary incident during wet condition two weeks back. When I bought it I did BMW used car check to make sure everything is fine. Their check reported corroded disc brakes along with few other minor faults.
During this incident my went out of control and spun before came to a stop. It was really scary with my 2 year old baby and wife in the car. I suspected about this ASC and took it back to the BMW center where I did the check. The guy took the car out for drive and tried to show me its nothing wrong with the car and their report. It was dry day, and driving was fine. He tried to bring up the ASC light by doing some sharp corners and going over holes. But it didn't. Finally he blamed tyres, wet condition, possible oil spill on the road etc.
Is there any way I can check to make sure the ASC is functioning? I want to see it working while I am driving!
A rainy day and a parking lot should get the light on just fine. From a stand still, accelerate hard to either the left or the right in as tight a corner as possible. The light should come on very quickly (it will blink in accordance to when your tyres are slipping)! I can get it to come on in dry weather doing the same thing, though I have a 330Ci and a bit of extra power to the rear wheels certainly helps ... In rainy weather, half throttle seems to do the trick :wink
even if the asc is working, it's only there as a means to correct minor mistakes or incidents of traction loss. not prevent it.
you can still spin out even with a fully functioning asc. do as gtc says, and take your car to a parking lot (empty) next time it rains, or even when you have the free minute to do it. thats about the only way to test for sure.
should it work proporly, the light will come on and you will feel and hear the power cut from the car as the asc tries to controll your acceleration.
I can get my light to come on doing two things...
(1) Hard acceleration from standstill even on dry pavement (with 5-speed tranny) ....although momentary
(2) Hard U-turn.. roll into it hard and try to accelerate through it..... it feels like your car is losing power as the light comes on...good indication of it working.
As above posts says, ASC is there to assist as you start to break the control threshhold... if you are on slippery surfaces and quickly swerve, brake or combo, the threshhold may be crossed so quickly that the vehicle may already be out of control...not even ASC can save u.
Another thting to consider is that the ASC system is extremely sensitive about setting fault codes and turning on the warning lamp continuously when there is a fault in the system. My experience is that even the slightest fault in the system will result in a solid illuminated light letting you know to get it to a mechanic ASAP. If you dont have this light on then its pretty safe to say the system is working properly.
I have just finished a month of hell with the dealer trying to fix my DSC which kept turing itself off...the reason....a wire was shorting slightly/occasionaly and the system was so sensitive it switched itself off and put all the error lights....
Also I believe the ASC is not the all singing/dancing Traction control dealers lead you to believe....I was under the impression it's more about stable braking and acceleration...no wheel lock and no wheel spin kind of thing????? Balance but not full Traction Control.
The parking lot idea is good. I can assure you that if it is working properly and you stopped, turn the wheel a bit left or right and accelerate hard the back end will not oversteer excessivly. If you press the defeat button and try the same again the car will spin out. That is proof it is working. The light coming on alone is not proof.
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