Modern braking systems have moved considerably from what they were even a few short years ago. Today’s anti-lock brakes offers better stopping ability and safety during hard stops and on slick surfaces (although they don’t give appreciably better stopping performance during good driving times). And while you might think these systems are always hydraulic in nature, they’re actually more electronic. They need a number of electronic parts in order to operate, and they need fuses and a minimum of one relay.
There are two primary fuses are used in then operation of a standard ABS system, although this differs significantly from one vehicle to the next and the exact number and configuration will depend on the ABS system manufacturer (not the auto manufacturer). One fuse lets power to flow into the system when the ignition key is turned to on, activating the relay and closing it. Immediately the relay closes its contacts, the second fuse lets power to flow into the rest of the ABS system. If either fuse or the relay is blown, the system will not function.
SEE ALSO:HOW TO TEST FUEL PUMP RELAY
Have in mind:
- Fuses are always the weakest spot on a circuit as a safeguard.
- While relays often fail much less frequently than fuses, they do fail from time to time.
- Failure of either fuse will lead to the ABS system not working, and the ABS light on the dash will come on.
How it’s carried out:
- The Anti-lock fuse or relay is verified that it requires replacement. The battery is disconnected.
- The defective Anti-lock fuse or relay is taken out from its mounting connection and connection checked.
- The new Anti-lock fuse or relay is installed into the connector. The battery is reconnected.
- The Anti-lock fuse or relay is checked for operation with a scanner and all codes diagnosed and cleared.
- The car is tested for proper operation of the Anti-lock system and the brakes.