System Description

When the ignition switch is in the ON or START position, power is supplied:
^ through 7.5 A fuse (No. (8), located in the fuse block J/B])
^ to ASCD main switch terminal (1) and
^ to ASCD brake switch terminal (1) (with A/T)
^ to ASCD hold relay terminal (5) (with M/T), (7) (with A/T).
When ASCD main switch is in the ON position, power is supplied:
^ from ASCD main switch terminal (3)
^ to ASCD hold relay terminal (1).
Ground is supplied:
^ to ASCD hold relay terminal (2)
^ through body grounds (M43), (M44) and (M60).
With power and ground supplied, ASCD hold relay is energized. And then power is supplied:
^ from ASCD hold relay terminal (3) (with M/T), (6) (with A/T)
^ to ASCD control unit terminal (4)
^ to ASCD main switch terminal (2) and
^ to ASCD clutch switch terminal (1) (with M/T).
After the ASCD main switch is released, power remains supplied:
^ to the coil circuit of ASCD hold relay
^ through ASCD main switch terminals (2) and (3).
This power supply is kept until one of following conditions exists.
^ Ignition switch is returned to the ACC or OFF position.
^ ASCD main switch is turned to OFF position.
When ASCD hold relay is energized, power is also supplied to ASCD control unit terminal (5)
^ through ASCD clutch switch and ASCD brake switch (with M/T) or
^ through ASCD brake switch, ASCD hold relay and inhibitor relay (with A/T).
Ground is supplied:
^ to ASCD control unit terminal (3)
^ through body grounds (M43), (M44) and (M60).

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 (with A/T)
^ ASCD clutch switch (with M/T)
^ ASCD brake switch.
A vehicle speed input is supplied:
^ to ASCD control unit terminal (7)
^ from terminal (23) of the combination meter.
Power is supplied at all times:
^ through 15 A fuse (No. (14), located in the fuse block [J/B])
^ to stop lamp switch terminal (1).
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. (42), 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 (3).
When the SET/COAST button is depressed, power is supplied:
^ from terminal (2) of the ASCD steering switch
^ to ASCD control unit terminal (2).
When the RESUME/ACCEL button is depressed, power is supplied:
^ from terminal (1) 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 selector lever is placed in "P" or "N" (with A/T)
^ the clutch pedal is depressed (with M/T) or
^ the brake pedal is depressed.

Outputs
The ASCD pump controls the throttle drum via the ASCD wire based on inputs from the ASCD control unit. The ASCD pump 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 (25).
Ground is supplied:
^ to combination meter terminal (27)
^ through body grounds (M43), (M44) and (M60).
With power and ground supplied, the CRUISE indicator illuminates.
When vehicle speed is approximately 8 km/h (5 MPH) below set speed on A/T models, a signal is sent:
^ from terminal (12) of the ASCD control unit
^ to transmission control module (TCM) terminal (40) (with A/T).
When this occurs, the transmission control module cancels overdrive.
After vehicle speed is approximately 3 km/h (2 MPH) above set speed, overdrive is reactivated.