SW L4-1.9L DOHC VIN 7 (1993)
ABS Light: Description and Operation
The ANTILOCK brake indicator is illuminated by the anti lock brake system (ABS) module. The cluster supplies an 8.0 volt (nominal [6.2 volt
minimum]) input, through a resistor, located in the instrument cluster. This voltage drives an NPN transistor in the instrument cluster allowing current to
flow through the bulb. If the ABS module provides a ground to the input of the cluster, then the NPN transistor is turned off and the bulb remains off. If
this input is open when ignition voltage is present, the ANTILOCK brake indicator lamp illuminates.
The ANTILOCK indicator lamp is illuminated, for approximately two seconds, during engine start-up by the ABS module for a bulb check.
