Normal Operation
The FEM module operates at a voltage between 10 and 17 volts. Voltage is supplied by circuit 29S-DK21 (OG/WH) (B+ at all times). RBJB relay 32 coil ground is provided through circuit 31S-DK21 (BK/WH).
The FEM module sends the VAPS solenoid a pulse width modulated (PWM) circuit through circuit 8-CE9 (WH/GN). The VAPS solenoid sends a feedback voltage to the FEM module, (depending on power steering assist demand), through circuit 9-CE9 (BN/GN).
The FEM module sends the VAPS solenoid a pulse width modulated (PWM) current through circuit 8-CE9 (WH/GN). The VAPS solenoid sends a feedback voltage to the FEM module, (depending on power steering assist demand), through circuit 9-CE9 (BN/GN).
The VAPS system provides power assist to steering input by multiplying the turning force applied at the steering wheel. When the vehicle is at rest or at a speed below 3.2 km/h (2 mph), the VAPS system supplies maximum assist. Between 3.2 km/h (2 mph) and 191 km/h (119 mph), power assist will decrease gradually at a calibrated rate to raise steering efforts for increased directional stability and greater road feel. Above 191 km/h (119 mph), steering assist is constant.
The power steering pump, which is driven by the crankshaft through a drive belt and pulleys, develops the hydraulic pressure necessary to operate the system. When the engine is running, fluid is drawn into the power steering pump from the power steering pump reservoir. Hydraulic fluid is pressurized in the power steering pump and sent to the steering gear. The rotary valve determines fluid direction to assist the driver in the turning of the vehicle. When the steering wheel is turned, the steering gear converts this hydraulic pressure and flow into mechanical motion that will move the front wheels in the direction of the turn. The steering gear uses tie rod ends to connect the front knuckles, which then pivot on the ball joints, steering the vehicle.
The power steering pump, which is driven by the crankshaft through a drive belt and pulleys, develops the hydraulic pressure necessary to operate the system. When the engine is running, fluid is drawn into the power steering pump from the power steering pump reservoir. Hydraulic fluid is pressurized in the power steering pump and sent to the steering gear. The rotary valve determines fluid direction to assist the driver in the turning of the vehicle. When the steering wheel is turned, the steering gear converts this hydraulic pressure and flow into mechanical motion that will move the front wheels in the direction of the turn. The steering gear uses tie rod ends to connect the front knuckles, which then pivot on the ball joints, steering the vehicle.
When the steering wheel is turned, the steering shaft rotates in the steering column on bearings. This mechanical motion is then converted to hydraulic pressure that reduces assists in the effort that it takes to steer the vehicle. This hydraulic pressure from the power steering pump to the power steering gear is then converted back to mechanical motion that will move the front wheels in the direction of the turn. The steering gear uses tie rod ends to connect the front knuckles to one another. The knuckles then pivot on the ball joints in order to steer the vehicle.
When the steering wheel is turned, the steering shaft rotates in the steering column on bearings. This mechanical motion is then converted to hydraulic pressure that reduces assists in the effort that it takes to steer the vehicle. This hydraulic pressure from the power steering pump to the power steering gear is then converted back to mechanical motion that will move the front wheels in the direction of the turn. The steering gear uses tie rod ends to connect the front knuckles to one another. The knuckles then pivot on the ball joints in order to steer the vehicle.
The ignition switch receives overload protected battery power from the rear battery junction box (RBJB) fuse 22 (20A) through circuit 30-DA5 (RD/BK). The ignition switch has 4 possible states
- OFF
- ACC
- RUN
- START
The ignition switch receives overload protected B+ power from the RBJB fuse 22 (20A) through circuit 30-DA5 (RD/BK). The ignition switch has 4 possible states
- OFF
- ACC
- RUN
- START
The ignition switch receives overload protected battery power from the BJB fuse 22 (20A) through circuit 30DA5 (RD/BK). The ignition switch has 4 possible states
- OFF
- ACC
- RUN
- START
The multifunction/hazard switch controls the following components
- Turn signals
- High/Low beam/flash-to-pass headlamps
- Wiper/washers
- Hazard lamps
The steering column telescopic motor receives information from the steering column position sensor when a memory position is requested. The steering column position sensor sends the telescopic motor position information to the instrument cluster where it is stored and is used when several adjustable features are requested. The steering column position sensor sends the steering column telescopic position to the instrument cluster through circuit 8-AL16 (WH/BK).
The steering column tilt motor receives information from the steering column position sensor when a memory position is requested. The steering column position sensor sends the tilt motor position information to the instrument cluster where it is stored and is used when several adjustable features are requested. The steering column position sensor sends the steering column tilt position to the instrument cluster through circuit 8-AL17 (WH/VT), and circuit 33-AL6 (YE/BU) powers the tilt motor.
The tilt/telescope switch is hardwired to the instrument cluster. Depending on the direction of the switch (UP/DOWN/IN/OUT) a signal is sent to the instrument cluster to activate the tilt or telescope motor. The steering column telescopic motor receives information from the steering column position sensor when a memory position is requested. The steering column position sensor sends the telescopic motor position information to the instrument cluster where it is stored and is used when several adjustable features are requested. The steering column position sensor sends the steering column telescopic position to the instrument cluster through circuit 8-AL16 (WH/BK).