Description & Operation

WARNING: Deactivate air bag system before performing any service operation. See AIR BAG RESTRAINT SYSTEMS article. DO NOT apply electrical power to any component on steering column without first deactivating air bag system. Air bag may deploy.

The cruise control system consists of the Automatic Speed Control Device (ASCD) control unit, ASCD actuator, and various control switches and sensors. See COMPONENT LOCATIONS . ASCD control unit controls system operation based on input from speedometer, brakelight switch, ASCD steering switch and Park Neutral Position (PNP) relay. ASCD control unit also signals Automatic Transmission (A/T) control unit when to cancel overdrive operation.

ASCD actuator controls the throttle drum, via ASCD cable, based on signals from ASCD control unit. ASCD actuator consists of vacuum motor, air valve and release valve. The ASCD control module monitors system for malfunctions. If a malfunction is detected, ASCD control unit will enter fail-safe mode and deactivate ASCD operation, and SET indicator light will flash in 0.4-second intervals. Certain malfunctions are stored in memory and can be retrieved for diagnosis using Nissan's CONSULT scan tool.

NOTE: Self diagnostics were written specifically for use with Nissan's CONSULT scan tool. Other scan tools can be used, but may have limited functions