GM Grand Am/Achieva/Calais/Skylark/Somerset 1985-98

General Description

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See Figures 1 through 5

Models prior to 1995 were equipped with an electronic/vacuum cruise control system which maintains a desired vehicle speed under normal driving conditions. The main components of the system are the mode control switches, controller (module), sevo unit, speed sensor, vacuum supply, electrical and vacuum release switches along with an electrical harness.

Newer models from 1995-98 are equipped with the electronic cruise control also. The system is a speed control system which maintains a desired vehicle speed under normal driving conditions. The main components of the electronic cruise control system are the functional control switches, cruise control module, vehicle speed sensor and cruise control release switch and stop lamp switch.

The cruise control release switch and stop lamp switch assemblies are used to disengage the system. Both switches are mounted on the brake pedal bracket. The system disengages electronically when the pedal is depressed.



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Fig. Fig. 1: Early model cruise control electrical and vacuum brake switch mounting



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Fig. Fig. 2: View of the cruise control clutch pedal release switch-1995 vehicle shown

The vehicle speed sensor (VSS) buffer assembly receives a signal form the VSS permanent magnet generator indicating the speed of the vehicle. The signal is then processed by the speed sensor and supplied to the ECM, cruise control module and speedometer. The VSS is usually mounted to the transaxle assembly.

The cruise control module is mounted on the front of the dash. The module has an electronic controller and an electric stepper motor to vary the throttle with each different cruise control mode. The module is not serviceable.



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Fig. Fig. 3: An actuator for the cruise control is located usually on the drivers side of the engine towards the rear-2.3L engine

The cruise control switch is usually mounted to the steering wheel or column assembly. The switch is used to start or disengage the cruise control system Three positions are available on the switch, OFF/ON, Resume and Accel. There is a Set/Coast switch located at the end of the switch and has two positions, normal and depressed. The system is cable activated.



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Fig. Fig. 4: View of the servo and related cruise control component locations-1992 vehicle



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Fig. Fig. 5: Crouise Contorl Troubleshooting

 
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