Cruise Control: Description and Operation

When the ignition switch is in the ON or START position, power is supplied:
^ through 10 A fuse (No. 11, located in the fuse block)
^ to ASCD brake switch terminal (2) (A/T models)
^ to ASCD main switch terminal (6) and
^ to ASCD hold relay terminal (5) (M/T models) or
^ to ASCD hold relay terminal (3) (A/T models).
With brake pedal released, power remains supplied:
^ through ASCD brake switch terminal (1) (A/T models) and
^ to ASCD hold relay terminal (6) (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 (1) of the ASCD main switch
^ to ASCD hold relay terminal (2) (M/T models) or
^ to ASCD hold relay terminal (1) (Air models).
Ground is supplied:
^ to ASCD hold relay terminal (1) (M/T models) or
^ to ASCD hold relay terminal (2) (Air models)
^ through body grounds (M49), (M105) and (M160) .
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 models) or
^ from terminal (5) of the ASCD hold relay (A/T models)
^ to ASCD main switch terminal (2),
^ to ASCD control unit terminal (4) and
^ to ASCD clutch switch terminal (1) (M/T models) or
^ from terminal (7) of the ASCD hold relay (A/T models)
^ to inhibitor relay terminal (3) (A/T models).
When the ASCD main switch is released to the N (neutral) position, power remains supplied:
^ to ASCD hold relay terminal (2) (M/T models) or
^ to ASCD hold relay terminal (1) (A/T models)
^ from ASCD main switch terminal (1).
^ Ground is supplied:
^ to ASCD control unit terminal (3)
^ through body grounds (M49), (M105) and (M160).

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 (Air models)
^ ASCD clutch switch (M/T models) and
^ ASCD brake switch.
A vehicle speed input is supplied
^ to ASCD control unit terminal (7)
^ from terminal (7) of the combination meter.
Power is supplied at all times:
^ to stop lamp switch terminal (1)
^ through 10 A fuse (No. 19, 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 17, located in the fuse block)
^ to horn relay terminal (2)
^ through terminal (1) of the horn relay
^ to ASCD steering switch terminal (21).

When the SET/COAST button is depressed, power is supplied:
^ from terminal 22 of the ASCD steering switch
^ to ASCD control unit terminal 2.
When the RESUME/ACCEL button is depressed, power is supplied:
^ from terminal 23 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 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 (2).
Ground is supplied to the vacuum motor:
^ from terminal (9) of the ASCD control unit
^ to ASCD pump terminal (3).
Ground is supplied to the air valve:
^ from terminal (10) of the ASCD control unit
^ to ASCD pump terminal (1).
Ground is supplied to the release valve:
^ from terminal (14) of the ASCD control unit
^ to ASCD pump terminal (4).
When the system is activated, power is supplied:
^ from terminal (13) of the ASCD control unit
^ to combination meter terminal (12).
Ground is supplied:
^ to combination meter terminal (42)
^ through body grounds (M49), (M105) and (M160).
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, ground is supplied:
^ to terminal (2) of the solenoid valve unit
^ from ASCD control unit terminal (12).
When this occurs, the overdrive is canceled.
When vehicle speed reaches approximately (3 kph (2 mph)) above set speed, overdrive is reactivated