Cruise Control May use intake manifold vacuum to pull open the throttle. May use electric motor to open throttle. Computer controlled Needs driver input, vehicle speed input, and safety release features. Solenoids will add or remove engine vacuum to the throttle servo Driver InputVehicle Speed Input Computer Control Safety Release Cruise Control Looks at vehicle speed Requires input from driver Set Resume Coast Cruise Control Will be designed to release throttle if there is any malfunction ANY loss of power will release Vacuum Port Open all servo vacuum when OFF and turn OFF the Cruise Control Computer grounds one solenoid to increase or decrease vehicle speed Vacuum Ports Closed when Off Computer grounds one solenoid to increase or decrease vehicle speed Diagnose Cruise Control Check input from brake/clutch switch (very common fault on older cars) Ensure good vacuum to control servo Check input from cruise control switch Check input from vehicle speed sensor Check voltage at cruise control servo Cruise Control Switch Where is the cruise control switch located? Steering Column What is dangerous about removing the Horn Pad? Air Bags Before you remove the steering wheel you must disarm the air bag…. ….or you might get a very flat nose …. …………….or worse……... Supplemental Restraint System Must be disabled prior to removing the air bag module Designed to fire after loss of battery power DO NOT SAVE the memory if procedure says to remove a battery cable Supplemental Restraint System If deployed: Sodium Hydroxide powder is irritating to skin and lungs Clock spring connector likely needs replacing due to power surge Clock-Spring Coil Follow specific procedure for centering clock spring coil. Some call for clockwise rotation Others call for counter-clockwise rotation Clock-Spring Coil If clock-spring is removed it must be centered. If steering linkage is removed …. ….remove the clock-spring… ….OR lock steering. If Clock-Spring is not centered… …or allowed to Over-Rotate… . Clock-Spring will break and Air Bag lamp will Turn On .