Cruise Control: Description and Operation

When the ignition switch is in the ON or START position, power is supplied
^ through 1O A fuse [No. (19) located in the fuse block (J/B)]
^ to ASCD hold relay terminals (1) and (5), and
^ to ASCD) switch (in combination switch) terminal (11).
When ASCD main switch is in the ON position, ground is supplied
^ to ASCD hold relay terminal (2)
^ through ASCD main switch terminal (15)
^ to ASCD main switch terminal (14)
^ through body grounds (M3) and (M90).
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 terminal (4)
^ to ASCD clutch switch terminal (1) (M/T models) or
^ to park/neutral position relay terminal (1) (A/T models) and
^ to CRUISE CONT. indicator (in combination meter) terminal (43)
Power remains supplied to ASCD control module terminal (4) when the ASCD main switch is released to the N (neutral) position.
Ground is supplied
^ to combination meter terminal (45) for CRUISE CONT. indicator
^ through body grounds (M3) and (M90).
With power and ground supplied, the CRUISE CONT. indicator illuminates and shows the system is ready.
Ground is supplied
^ to ASCD control unit terminal (3)
^ through body grounds (M3) and (M90).

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 switch (in combination switch)
^ park/neutral position 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 20 A fuse [No. (32) ,located in the fuse block (in relay box)].
When the brake pedal is depressed, power is supplied
^ from terminal (2) of the stop lamp switch
^ to ASCD control unit terminal (11).
When the SET/COAST switch is depressed, power is supplied
^ from terminal (12) of the ASCD switch
^ to ASCD control unit terminal (2).
When the RESUME/ACCEL switch is depressed, power is supplied
^ from terminal (13) of the ASCD 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 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 (41) and
^ to A/T control unit terminal (37) (A/T models).
Ground is supplied
^ to combination meter terminal (45)
^ through body grounds (M3) and (M90).
With power and ground supplied, the CRUISE indicator illuminates.
When vehicle speed is approximately 8 kph (5 MPH) below set speed 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 Apr control unit cancels overdrive.
After vehicle speed is approximately 3 kph (2 MPH) above set speed, overdrive is reactivated.