Buick 25111880 Module Asm,Cruise Control

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Mount the module with the push-in retainers, connect the electrical harness to the module, install the left sound insulator, connect the negative battery cable, then reset the radio, clock, etc. as necessary.

Remove the left side sound insulator, disconnect the electrical harness from the module.

Cruise control is a speed control system which maintains the desired vehicle speed under normal driving conditions. Most systems use vacuum to operate a throttle servo unit, which is overseen by the controller or Cruise Control Module (CCM). The system provides several modes of operation including cruise, coast, resume/accelerate, most allow "tap up" and "tap down", an incremental increase or decrease in set speed. The system will not engage until the vehicle exceeds a minimum speed, usually 25 mph (40 kph). The main parts of the vacuum systems are the mode control switches, Cruise Control Module (CCM), servo unit, Vehicle Speed Sensor (VSS), vacuum supply, electrical and vacuum release switches, and electrical harness. The system operates by trapping vacuum when the servo is at the designated position, and the controller reacts to 3 vehicle or system states. The system components include the vacuum servo unit, EMC Controller/Actuator, Electronic Controller (Module), and Vehicle Speed Sensor (VSS). The system also includes a Vacuum Accumulator, which is used to maintain satisfactory cruise control performance in vehicles with low manifold vacuum at normal road speeds.

Cruise control is a speed control system which maintains the desired vehicle speed under normal driving conditions.

The system includes a servo unit connected to the intake manifold, a speedometer cable-driven regulator, and various switches.

The vehicle should be test driven to determine if the cruise control is now working.

This cruising speed control system is optionally available on certain models and allows the driver to maintain a constant highway speed without the necessity of continual adjustment of foot pressure on the accelerator pedal. The system employs a servo unit connected to the intake manifold, a speedometer cable-driven regulator and various switches. An override capability is built in. Any malfunction in the performance of the system should first be checked out by inspecting the fuse, the security of the leads and terminals, and the vacuum pipes and connections. The following adjustments should then be checked and if necessary altered to conform to those specified. The servo operating rod which connects to the carburetor throttle linkage should be adjusted. The regulator can be adjusted by turning the orifice tube in or out (never remove it as it cannot be re-installed). If the vehicle cruises below the engagement speed, screw the orifice tube out. If the vehicle cruises above the engagement speed, screw the orifice tube in. Each¾ turn of the orifice tube will change the cruise speed by about 1 mph.Tighten the locknut after each adjustment. The brake release switch contacts must open when the brake pedal is depressed between ¼ and ½-in measured at the pedal pad. The vacuum valve plunger must clear the pedal arm when the arm is moved A inch measured at the switch. The column mounted engagement switch is non-adjustable, and is serviced only as part of the complete turn signal lever assembly. Faulty components should be replaced as complete assemblies after disconnecting electrical leads, vacuum hoses and control cables from them as necessary.

This cruising speed control system is optionally available on certain models and allows the driver to maintain a constant highway speed without the necessity of continual adjustment of foot pressure on the accelerator pedal. The system employs a servo unit connected to the intake manifold, a speedometer cable-driven regulator and various switches. An override capability is built in. Any malfunction in the performance of the system should first be checked out by inspecting the fuse, the security of the leads and terminals, and the vacuum pipes and connections. The following adjustments should then be checked and if necessary altered to conform to those specified. The servo operating rod which connects to the carburetor throttle linkage should be adjusted by turning the link on the rod until there is 0.02 to 0.04 inches of free play at the carburetor. The regulator can be adjusted by turning the orifice tube in or out (never remove it as it cannot be re-installed). If the vehicle cruises below the engagement speed, screw the orifice tube out. If the vehicle cruises above the engagement speed, screw the orifice tube in. Each ¼ tum of the orifice tube will change the cruise speed by about 1 mph. Tighten the locknut after each adjustment. The brake release switch contacts must open when the brake pedal is depressed between 0.38 and 0.64 inch measured at the pedal pad. The vacuum valve plunger must clear the pedal arm when the arm is moved j inch measured at the switch. The column mounted engagement switch is non-adjustable, and is serviced only as part of the complete tum signal lever assembly. Faulty components should be replaced as complete assemblies after disconnecting electrical leads, vacuum hoses and control cables from them as necessary.