Cruise Control: Description and Operation

When the ignition switch is in the ON or START position, power is supplied
^ through 10 A fuse (No. (26), located in the fuse block)
^ to Automatic Speed Control Device (ASCD) Cancel Switch terminal (1) (A/T models)
^ With brake pedal released, power remains supplied through ASCD cancel switch terminal (2) (A/T models) and
^ to ASCD hold relay terminal (7) (A/T models)
^ through 10 A fuse (No. (26) , located in the fuse block)
^ to ASCD main switch terminal (1) and
^ to ASCD hold relay terminal (5) (M/T models).or
^ to ASCD hold relay terminal (5) (A/T models).
When ASCD main switch is in the ON position, power is supplied
^ from terminal (2) of the ASCD main switch
^ to ASCD control unit terminal (4) and
^ from terminal (3) of the ASCD main switch
^ to ASCD hold relay terminal (1) (M/T models) or
^ to ASCD hold relay terminal (1) (A/T models).
Ground is supplied
^ to ASCD hold relay terminal (2) (M/T models) or
^ to ASCD hold relay terminal (2) (A/T models).
^ through body grounds (E12) and (E37).
With power and ground supplied, the ASCD hold relay is activated, and power is supplied
^ from terminal (3) of the ASCD hold relay (M/T or A/T models)
^ to ASCD control unit terminal (4) and
^ to ASCD clutch pedal position switch terminal (1) (M/T models) or
^ from terminal (6) of the ASCD hold relay (A/T models)
^ to inhibitor relay terminal (3) (A/T models).
Power remains supplied to ASCD control unit terminal (4) when the ASCD main switch is released to the N (neutral) position.
Ground is supplied
^ to ASCD control unit terminal (3)
^ through body grounds (M51), (M76) and (M77).

Inputs
At this point, the system is ready to activate or deactivate, based on inputs from the following:
^ speedometer in the combination meter
^ stop lamp switch
^ ASCD steering switch
^ inhibitor relay (A/T models)
^ ASCD clutch pedal position switch (M/T models)
^ ASCD cancel switch.
A vehicle speed input is supplied
^ to ASCD control unit terminal (7)
^ from terminal (5) of the combination meter.
Power is supplied at all times
^ to stop lamp switch terminal (1)
^ through 15 A fuse (No. (18), located in the fuse block).
When the brake pedal is depressed, power is supplied
^ from terminal (2) of the stop lamp switch
^ to ASCD control unit terminal (11).
Power is supplied at all times
^ through 10 A fuse (No. (35), located in the fusible link and fuse box)
^ to horn relay terminal (1)
^ through terminal (3) of the horn relay
^ to ASCD steering switch terminal (12).
When the SET/COAST button is depressed, power is supplied
^ from terminal (14) of the ASCD steering switch
^ to ASCD control unit terminal (2).
When the RESUME/ACCEL button is depressed, power is supplied
^ from terminal (13) of the ASCD steering switch
^ to ASCD control unit terminal (1).
When the CANCEL button is depressed, power is supplied
^ to ASCD control unit terminals (1) and (2).
When the system is activated, power is supplied
^ to ASCD control unit terminal (5).
Power is interrupted when
^ the shift lever is placed in P or N (A/T models)
^ the clutch pedal is depressed (M/T models) or
^ the brake pedal is depressed.

Outputs
The ASCD actuator controls the throttle drum via the ASCD wire based on inputs from the ASCD control unit. The ASCD actuator consists of a vacuum motor, an air valve, and a release valve.
Power is supplied
^ from terminal (8) of the ASCD control unit
^ to ASCD actuator terminal (1).
Ground is supplied to the vacuum motor
^ from terminal (9) of the ASCD control unit
^ to ASCD actuator terminal (4).
Ground is supplied to the air valve
^ from terminal (10) of the ASCD control unit
^ to ASCD actuator terminal (2).
Ground is supplied to the release valve
^ from terminal (14) of the ASCD control unit
^ to ASCD actuator terminal (3).
When the system is activated, power is supplied
^ from terminal (13) of the ASCD control unit
^ to combination meter terminal (25) and
^ to A/T control unit terminal (37) (A/T models).
Ground is supplied
^ to combination meter terminal (27)
^ through body grounds (M51), (M76) and (M77).
With power and ground supplied, the CRUISE indicator illuminates.
When the RESUME/ACCEL button is depressed on A/T models, a signal is sent
^ from terminal (12) of the ASCD control unit
^ to A/T control unit terminal (40).
When this occurs, the A/T control unit cancels overdrive.