Power Circuits and Conditions

ABS system power is provided through the Over-Voltage Protection Relay (OVPR). This relay includes a special diode arrangement which will interrupt power to the Anti-Lock Brake System in the event of excessively high system voltage. This relay will cause the 20 amp brake fuse (fuse #R4 in the rear fuse panel) to blow if high system voltages are encountered. Should an over-voltage situation occur, the relay will not be damaged and can be used again.

The OVPR coil is powered through the 7.5 amp inline brake fuse, located under the dash near the EBCM connector. The relay coil is provided both

power and ground whenever the ignition is in the run position, meaning that the system should be receiving power anytime the ignition is on.

Circuit 850 distributes power to the ABS when the relay contacts are closed. Components which receive power from this circuit include:

^ EBCM - Pin 1

^ Sensor Block - Pins 3 and 4

^ Pump Relay Connector (for relay coil) - Pin 4

Circuit 850 is provided battery voltage through the 20 amp Brake fuse in the rear fuse panel.