BMW E39 5-Series ABS ASC Control Module Replacement | 1997-2003 525i, 528i, 530i and 540i

If you have an ABS/ASC warning light on in your instrument cluster you have a problem with the ABS/ASC system and you do not have the use of your anti-lock brake function or traction control. This can lead to unsafe driving situations. If you have the codes pulled in the braking system and you get a code for the brake pressure switch voltage being low it may not be the pressure switch that is the problem. Sometimes the module fails to put out the 5 volt reference and therefore the signal voltage drops out. The ABS/ASC module sees this as a failure of the switch and not the module 5 volt reference. You can send the module out to companies like Module Masters and they can sometimes repair your unit. If your unit goes back in the car there is no need to code the unit. If you purchase a new one and install it you will have to take it to an automotive repair shop that has the equipment to program or code the modules for you. ABS/ASC Module Removal: Make sure the ignition key is off. If the key is on you will cause diagnostic trouble codes to set in other modules that will need to be cleared by someone with the equipment to do so. Read the Full Article: Project Time: 3 hours Tab: $100 Tools: T20 Torx bit, flat head screwdriver, Digital Meter Parts Required: Brake ABS ASC Module, fasteners Performance Gain: Replace failed module keeping the ABS ASC warning light on. Complementary Modification: Replace the brake pressure switch.