Question about BMW 325

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ASC + T light permanently on

Please how do i put it off

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Whenever this warning light or any other stays on in the dash it is indicating that the systems control module (or the system sensor in the case of lights like low oil pressure, door open indicators etc.) has detected a fault, it then disables the system (this applies to ABS,TCS, TCM, SRS, TPMS, MIL, CEL and BCM faults and others) as long as the light is on. You must now have the dealer hook up a special electronic diagnostic tool and "scan" the system for the fault code that is stored for the problem(s)

Legend of Abbreviations. ABS Anti-lock brake system. TCS Traction control system, TCM Transmission control module, SRS Supplemental restraint system, BCM Body control module. TPMS Tire Pressure Monitor System, MIL Malfunction Indicator Lamp, CEL Check Engine Light.

Posted on Nov 09, 2012

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I have a 1999 BMW 323I five speed, but when ever I shift to 3rd gear the asc light comes on and the car will not pick up speed


ASC light is part of the ABS system. ASC means slip control system.When this light comes on because it is integrated with the DME or for a better term ECM (control module) It commands trottle reduction. The ASC uses the wheel speed sensor your only fix is get the ABS or (brake inspection) look at The computure engine management thinks you are slipping.

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I have a warning light on with an ! in it not sure wot it means could u help plz


If you have an automatic transmission, you may have two exclamation points in warning lights on the dash. The one in the circle with gear cogs around its perimeter is an error warning light for the computer in the automatic transmission. I have never had that light, but I would first disconnect the battery to try to clear it, and if that failed, I would have to take the car to a good independent shop that specializes in BMWs. Go to Car Talk website for recommendations for a shop.
The exclamation point in a triangle which in turn is in a circle, located between the speedometer and tach, is for the Automatic Stability Control. It should illuminate when you press the ASC button on the console which turns the ASC off. The light warns you when the ASC is turned off.
If there is a problem with the ASC, the most common problems are: 1) Failed switch in the console. 2) Damage or foreign objects in the wheel speed sensors. There are tooth wheels near the front brake rotors and on the rear axle. There are sensors near the toothed wheels that detect wheel speed. The the sensors must be the correct distance from the toothed wheel. If their wires are chaffed, or the toothed wheel is bent or broken, they won't work. 3) Poor connections on the ASC electrical connectors under the hood. Look on the ASC (outboard) throttle body and on the brake controller module. 4) I once put on a new throttle body rubber boot, and I left the screw on the hose clamp positioned at 12 o-clock, up on top of the boot. The ASC throttle arm collided with the hose clamp screw so the throttle motion was restricted. That set an ASC error code and illuminated the light.

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1 Answer

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Check the ABS brake sensors in your wheels, if they are not functioning properly. It will trigger the computer to engage the ASC auto stability control light as the asc uses the brakes to assist in control. I will also engage the EML engine management light to slow the rev point to limp mode

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Check to see if your brake pads and rotors are in good condition. Or if you have replaced the pads yourself and have not reset the wheel sensors this would cause the ABS Antilock Brake System light and the ASC Automatic Stability Control light to stay on as the ASC uses the ABS brakes with computer assistance to control the traction of the car if not fixed it can effect your rev limiter slowing performance

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Check to see if your brake pads and rotors are in good condition. Or if you have replaced the pads yourself and have not reset the wheel sensors this would cause the ABS Antilock Brake System light and the ASC Automatic Stability Control light to stay on as the ASC uses the ABS brakes with computer assistance to control the car

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Check to see if your brake pads and rotors are in good condition. Or if you have replaced the pads yourself and have not reset the wheel sensors this would cause the ABS Antilock Brake System light and the ASC Automatic Stability Control light to stay on as the ASC uses the ABS brakes with computer assistance to control the car

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1 Answer

My ASC+T Indicator Lamp lights and car can't move...


When your ASC light is on this is to let you know your Automatic Stability Control system is switched off press the ASC button Till light is off /ASC is on this works with your rev limiter and should stabilized your idle. If the problem persists have your throttle control unit checked as this can trigger the ASC light as well and may also activate the ABS light if not fixed

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1 Answer

Battery light comes on while driving with a loss of power?


Have your battery checked to make sure it does not have a bad cell, have your alternator checked to make sure it is putting out a full charge to your battery. Sometimes the ASC light is activated wen there is an engine issue that does not have it's own code.You may also wish to have your parking lamps checked to make sure your lamp connections do not have worn wire covers that may be grounding out.

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1 Answer

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When your ASC light is on this is to let you know your Automatic Stability Control system is switched off press the ASC button Till light is off /ASC is on this works with your rev limiter and should stabilized your idle. If the problem persists have your throttle control unit checked as thi can trigger the ASC light as well and may also activate the ABS light if not fixed

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