Circuit Description

Cruise switch within turn signal lever receives ignition voltage from a 15-amp fuse to turn signal lever cruise switches. Cruise ON/OFF, SET/COAST and RESUME/ACCEL switches are inputs to cruise portion of PCM.

Cruise servo vent and vacuum solenoids output are controlled by high side drivers in PCM. When ignition is on, PCM looks at these output lines and will set codes if an incorrect status is seen on any line.

Vacuum solenoid is a normally closed solenoid valve that blocks flow of vacuum to cruise servo. When solenoid is on (energized), solenoid valve opens allowing vacuum to be drawn into servo.