ABS indicator light

70M0398

• A ABS control unit
• B Solenoid valves
• C Rear fail – safe relay
• D Front fail – safe relay

When abnormality is detected in the control system by the self – diagnosis, the solenoid operations are suspended by turning off the 2 fail – safe relays. This disconnects the earth paths of all the solenoid valves to inhibit ABS operation.

ABS indicator light

The ABS control unit turns on the ABS indicator light when one or more of the following abnormalities is detected. This is only a partial list.

• When the operating time of the motor in the ABS pump assembly exceeds the specified period.
• When vehicle running time exceeds 30 seconds without releasing the parking brake lever.
• When one of the rear wheels is locked during running.
• When absence of speed signals from any of the four wheel sensors is detected.
• When the activation time of all solenoids exceeds a given time or an open circuit is detected in the solenoid system.
• When solenoid output is not detected in the simulated anti – lock brake system operation carried out during running at speeds of 10 km/h (6 mph) or more.

To check the ABS indicator light bulb, the light is activated when the ignition switch is first turned on. It is turned off after the engine is started if there is no abnormality in the system.