Principles Of Operation

Principles of Operation


Hydraulic Brakes

To diagnose hydraulic brake concerns, refer to Brake System - General Information Testing and Inspection.


Adjustable Pedals Without Memory Feature

The adjustable pedals are controlled directly by the adjustable pedal switch. When the adjustable pedal switch is pressed, voltage is sent to the motor. The adjustable pedal motor is attached to the RH side of the accelerator pedal assembly and controls the accelerator pedal directly. The motor controls the brake pedal through the use of a cable contained inside a sleeve and a worm gear set. The adjustable pedal motor can operate in both directions, forward or rearward, depending on which direction the switch is pressed. The motor spins the cable inside the sleeve, the cable spins the worm gear set attached to the brake pedal and the pedals move. The pedals can be adjusted with the ignition switch in the OFF, ACC or RUN position.


Adjustable Pedals With Memory Feature

The adjustable pedals with memory feature are controlled by the Driver Seat Module (DSM) and can be adjusted in 3 different ways:

- Using the adjustable pedal switch.
- Using the memory SET switch.
- Using the Remote Keyless Entry (RKE) transmitter.

When the adjustable pedal switch is pressed, a voltage signal is sent to the DSM. When the DSM receives this signal, it will operate the adjustable pedal motor in the same manner as the system without memory.

When the memory SET switch or RKE transmitter is activated, a voltage signal is sent to the DSM. When the DSM receives this signal, it will send voltage to the adjustable pedal motor. The adjustable pedal motor will operate the same as when the adjustable pedal switch is used, as described above. The DSM monitors pedal position through the use of a Hall-effect switch that is built into the pedal motor. The pedal positions remain in memory as long as the DSM retains power. When a memory position is recalled through either the memory SET switch or the RKE transmitter, the DSM monitors the Hall-effect switch and stops sending voltage to the pedal motor once the stored memory position is reached. If the DSM receives a pedal position input during a memory position recall function, the module will stop the memory recall and respond to the new pedal position input. The pedals can be adjusted from the memory SET switch or the RKE transmitter with the ignition switch in the OFF, ACC or RUN position, but the transmission must be in the PARK or NEUTRAL position.

The DSM also controls the driver seat and the exterior mirrors. The DSM continually monitors the adjustable pedal motor and circuits, if an error is detected the DSM is capable of setting DTCs.

For information on setting and recalling a memory pedal position, refer to Memory Position Programming in Seating Programming and Relearning.