Anti-lock Braking System(ABS) 16 In normal conditions when the ignition is switched on the ABS and EBD lamp will come on and then switch off after 1 - 2 seconds. During this period the system will perform self diagnosis is to confirm that all inputs and outputs are working correctly. If the ABS warning lamp remains on after this time it means either: 1. The ABS system has not been connected or the connector is loose. 2. The system has detected a failure and will need to be diagnosed. 3. Battery or Ignition line fuses have blown out. 4. Ignition line is cut. The EBD lamp is shared with the brake fluid level and parking brake, hence if the EBD warning lamp remains on after this time it means either: 1. The park brake is applied. 2. The Brake fluid level is low. 3. The ABS system has not been connected. or the connector is loose. 4. Park brake switch/ harness of parking brake or brake fluid is loose 5. The system has detected a failure and will need to be diagnosed. If the warning light does not come on during Ignition, the fault should be sought in the Instrument Cluster. If the ABS system detects any fault that may adversely affect its performance it will switch to a fail safe shut down mode. When this happens the electricity supply to the solenoid valves is deactivated, stopping control signal output, this causes the valves to switch to their default state. (Open for inlet valves / Closed for Outlet valves) In this condition, the conventional hydraulic brake circuit will still function, allowing brake pressure to reach all wheels. It should be noted that with an ABS fault it will be possible to lock the wheels and in the Case of an EBD failure the brake force proportioning between front and rear will no longer function and hence rear wheel lock is possible before front wheel lock.
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