Modern braking systems have advanced greatly from what they were even a few short years ago. Today’s anti-lock brakes offer better stopping ability and safety during hard stops and on slick surfaces (although they don’t provide appreciably better stopping performance during good driving conditions). And while you might reason these systems are largely hydraulic in nature, they’re actually more electronic. They require a number of electronic parts in order to work, and they need fuses and at least one relay.
There are two primary fuses involved with the operation of a standard ABS system, although this varies considerably from one vehicle to the next and the exact number and configuration will depend on the ABS system manufacturer (not the automaker). One fuse enables power to flow into the system once the key is turned to on, activating the relay and closing it. Once the relay closes its contacts, the second fuse enables power to flow into the rest of the ABS system. If either fuse or the relay is blown, the system will not function.
Facts to Note:
Fuses are the weakest spot on a circuit as a safeguard.
While relays fail much less frequently than fuses, they do fail from time to time.
Failure of either fuse will result in the ABS system not operating, and the ABS light on the dash illuminating.
How to Fix:
The Anti-lock fuse or relay is proved that it needs to be changed. The battery is disconnected.
The faulty Anti-lock fuse or relay is detached from its mounting connection and connection checked.
The new Anti-lock fuse or relay is fixed into the connector. The battery is reconnected.
The Anti-lock fuse or relay is tested for operation with a scanner and all codes diagnosed and cleared.
The vehicle is tested for proper operation of the Anti-lock system and the brakes.
In order to function, your ABS system needs electricity. This is controlled by the anti-lock fuses and relay. The first fuse (a 10 amp fuse) must be good in order for electricity to flow to the relay, and the relay must operate to provide power to the second fuse (a 30 amp fuse). This fuse must be good as well in order for power to pass into the entire ABS system. If you notice the ABS light on in your dash, have it diagnosed and changed by one of your expert mechanics immediately.
Common symptoms indicating you may need to change the Anti-Lock Fuses or Relay:
ABS light on in dash
ABS pump will function
ABS system does not engage
Importance of this service:
Anti-lock brake operation plays a vital role in avoiding accidents and is important to the safe operation of your vehicle. For most drivers, the only indication that there is something wrong with the anti-lock braking system will be the ABS light in the dash. Since most drivers rarely require the use of the ABS system itself, waiting to see if the system works properly is unsafe. If the ABS light is lit up in the dash, have one of your expert mechanics do an inspection straightaway and change any faulty fuses or relay.