Cruise Control Electronic Control Unit

The BECM communicates with the cruise control ECU via hardwired connections. The BECM provides a 12V square wave speed signal input to the cruise control ECU. The speed signal is derived from the ABS ECU.

The BECM also supplies a power input to the cruise control ECU for actuator power. This is supplied via the normally closed brake switch located in series between the BECM and the ECU. When the switch is closed the BECM provides a 12V supply for actuator power.

When the brake pedal is depressed the switch opens, pulling the supply low and removing the power supply. The ECU responds by cancelling cruise control and opens a dump valve releasing all air stored in the vacuum system. See DESCRIPTION & OPERATION in appropriate CRUISE CONTROL article in ACCESSORIES & EQUIPMENT.