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) main switch terminal (1) and
^ To ASCD hold relay terminal (5)
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 (2).
Ground is supplied
^ To ASCD hold relay terminal (1)
^ Through body grounds (E10) and (E33).
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 control unit terminal (4) and
^ To ASCD clutch switch terminal (1) (M/T models) or
^ To inhibitor relay terminal (4) (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 (M1) 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 (A/T models)
^ ASCD clutch switch (M/T models)
^ ASCD cancel switch.
A Vehicle speed input is supplied
^ To ASCD control unit terminal (7)
^ From terminal (15) of the combination meter.
Power is supplied at all times
^ To stop lamp switch terminal (1)
^ Through 2O A fuse (No. (24) ,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 (1).
Power is supplied at all times
^ Through 15 A fuse (No. (18) , located in the fusible link and fuse box)
^ To horn relay terminal (2)
^ Through terminal (1) of the horn relay
^ To ASCD steering switch terminal (1).
When the SET/COAST switch is depressed, power is supplied
^ From terminal (2) of the ASCD steering switch
^ To ASCD control unit terminal (2).
When the RESUME/ACCEL switch is depressed, power is supplied
^ From terminal (3) of the ASCD steering switch
^ To ASCD control unit terminal (1).
When the 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 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 (7) and
^ To A/T control unit terminal (37) (A/T models).
Ground is supplied
^ To combination meter terminal (19)
^ Through body grounds (M1) and (M60).
With power and ground supplied, the CRUISE indicator lamp illuminates.
When the RESUME/ACCEL switch 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.