Cruise Control: Description and Operation

When the ignition switch is in the ON or START position, power is supplied
^ through 7.5 A fuse (No. (12), located in the fuse block in the HEC)
^ to ASCD main switch terminal (1) and
^ to ASCD hold relay terminal (5) and ASCD clutch switch relay terminal (1) (M/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).
Ground is supplied
^ to ASCD hold relay terminal (2)
^ through body grounds (E5) and (E30).
With power and ground supplied, the ASCD hold relay is activated, and power is supplied
^ from terminal (3). of the ASCD hold relay
^ to ASCD clutch switch relay terminal (6) (M/T models) or
^ to inhibitor relay terminal (3) (A/T models).
Power remains supplied also 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 (M13) and (M73).

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 switch (M/T models) and
^ ASCD cancel switch.
A vehicle speed input is supplied
^ from terminal (14) of the combination meter
^ to ASCD control unit terminal (7)
Power is supplied at all times
^ to stop lamp switch terminal (1)
^ through 15 A fuse (No. (10) ,located in the fuse block in the HEC).
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 1O A fuse (No. (53) located in the fuse and fusible link box)
^ to horn relay terminal (2)
^ through terminal (1) of the horn relay
^ to ASCD steering switch terminal (12)
When the SET/COAST switch is depressed, power is supplied
^ from terminal (14) of the ASCD steering switch
^ to ASCD control unit terminal (2).
When the RESUME/ACCEL switch is depressed, power is supplied
^ from terminal (13) of the ASCD steering switch
^ to ASCD control unit terminal (1).
When the ASCD CANCEL switch 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 pump terminal (1).
Ground is supplied to the vacuum motor
^ from terminal (9) of the ASCD control unit
^ to ASCD pump terminal (4)
Ground is supplied to the air valve
^ from terminal (10) of the ASCD control unit
^ to ASCD pump terminal (2).
Ground is supplied to the release valve
^ from terminal (14) of the ASCD control unit
^ to ASCD pump terminal (3).
When the system is activated, power is supplied
^ from terminal (13) of the ASCD control unit
^ to combination meter terminal (8) and
^ to A/T control unit terminal (37) (A/T models).
Ground is supplied
^ to combination meter terminal (31)
^ through body grounds (M13) and (M73).
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.