Firebird V8-350 5.7L VIN P SFI (1996)
Fig.3-Symbols (Part 3 Of 3)
Vacuum Motors operate like electrical solenoids, mechanically pushing or pulling a shaft between two fixed positions. When vacuum is applied, the
shaft is pulled in. When no vacuum is applied, the shaft is pushed all the way out by a spring.
Double Diaphragm Motors can be operated by vacuum in two directions. When there is no vacuum, the motor is in the center "at rest" position.
Some Vacuum Motors such as the Servo Motor in the Cruise Control can position the actuating arm at any position between fully extended and fully
retracted. The servo is operated by a control valve that applies varying amounts of vacuum to the motor. The higher the vacuum level, the greater the
retraction of the motor arm. Servo Motors work like the two position motors; the only difference is in the way the vacuum is applied. Servo Motors are
generally larger and provide a calibrated control.
Supplemental Inflatable Restraint (SIR) System
SIR Symbol
The Supplemental Inflatable Restraint (SIR) symbol is used on schematics to alert the technician to the following important caution.
CAUTION: This vehicle is equipped with SIR. Refer to CAUTIONS in SIR under Air Bags and Seat Belts before performing service on or around SIR
components or wiring. Failure to follow CAUTIONS could result in possible air bag deployment, personal injury, or otherwise unneeded SIR system
repairs.
