Principles of Operation

Principles of Operation


Hydraulic Brakes

To diagnose hydraulic brake concerns, refer to Brakes and Traction Control. Testing and Inspection


Adjustable Pedals

The brake and accelerator pedals can be adjusted for a more comfortable driving position. The adjustable pedals may be connected to the memory system, if equipped, or they may be a stand alone system.


Without Memory Feature

The adjustable pedals without memory feature are controlled directly by the adjustable pedal switch. The adjustable pedal motor is attached to the accelerator pedal bracket and controls the accelerator pedal directly. The adjustable brake pedal is connected to the motor by a cable that rotates inside a sleeve. This allows both the brake and accelerator pedals to move together as an assembly. When the adjustable pedal switch is pressed, voltage is sent to the motor. The adjustable pedal motor will operate in both directions, forward and rearward, depending on which direction the switch is pressed. The end of the motor attached to the accelerator pedal bracket will rotate the pinion of a worm gear set and cause the accelerator pedal to move. At the same time, the other end of the motor will rotate the cable inside the sleeve which will cause the brake pedal adjuster to move through the use of a worm gear set. The pedals can be adjusted with the ignition switch in the OFF, ACC or RUN position, regardless of transmission gear selection.


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

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.

Adjustable Pedal Switch

When the adjustable pedal switch is pressed, 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 in either direction, forward or rearward, depending on which direction the switch is pressed. The end of the motor attached to the accelerator pedal bracket will rotate the pinion of a worm gear set and cause the accelerator pedal to move. At the same time, the other end of the motor will rotate the cable inside the sleeve which will cause the brake pedal adjuster to move through the use of a worm gear set. The pedals can be adjusted from the adjustable pedal switch with the ignition switch in the OFF, ACC or RUN position, regardless of transmission gear selection.

Memory SET switch and RKE Transmitter

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.


Memory Position Setting and Recalling

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