Electronic Brake Control Relay Test

This test allows monitoring the voltage available to the Electronic Brake Control Module (EBCM) while turning the Electronic Brake Control Relay ON and OFF. When the relay is commanded ON, the voltage should be equal to battery voltage. When the relay is OFF, the voltage should drop below 5 volts.

NOTE: Voltage will not drop to zero when the relay contacts are open due to capacitors in the EBCM. If voltage drops below 5 volts, the relay is operating properly.