Drive Mode Description and Operation

Secondary and Configurable Customer Controls | Description and Operation | Document ID: 5613821 The ride control system is a customer configurable control that allows the vehicle operator to tailor the vehicle operation and driveabiity parameters based on driving conditions. The ride control is controlled by the vehicle operator through the Ride Control Switch. The Ride Control Switch is a momentary rotary knob with two internal switches and up to four LED indicators. Rotating the knob left or right will change to the next ride control and the corresponding ride control indicator on the switch will illuminate. The Ride Control Switch is an input to the Engine Control Module. When the knob is rotated, the Engine Control Module will broadcast a message to all modules indicating the requested ride control. Control modules that are involved in changing their operation based on differing ride controls will then change their operating values. The Body Control Module will illuminate the appropriate ride control indicator on the Ride Control Switch. The components of the ride control are: Ride Control Switch Engine Control Module Body Control Module Other control modules or components that may respond to the commanded ride control are: Electronic Brake Control Module Power Steering Control Module Rear Differential Clutch Control Module Transmission Control Module Ride Control Switch The Ride Control Switch is a momentary rotary knob with two switches and up to four indicators. At rest, the Ride Control Switch remains in a neutral position with both switches open. When rotated to the left or right, the corresponding switch is closed. When released, the rotary knob returns to the neutral position and both switch will again be open. The two switches are situated within a resistor ladder. The Engine Control Module applies 5 volts to the resistor ladder, which also receives a constant ground. The Engine Control Module monitors the signal voltage. The signal voltage is measured within the resistor ladder. As each switch is closed, current flows through a different number of resistors, changing the voltage drop across the resistors and changing the voltage monitored by the Engine Control Module. Engine Control Module The Engine Control Module monitors the Ride Control Switch as an input. The Engine Control Module applies 5 volts to the switch resistor ladder and monitors the signal voltage from the switch. As the switch is rotated to the left or right, current flows through different resistors and the voltage monitored at the Engine Control Module also changes. The Engine Control Module uses this voltage change to determine if the rotary knob is in the at rest position or has been turned left/right. The Engine Control Module will change the ride control based on this input. When a ride control change is requested by the drive through the Ride Control Switch, the Engine Control Module will broadcast a message to all modules indicating the requested ride control. Control modules that are involved in changing their operation based on differing ride controls will then change their operating values. The Engine Control Module may also change operating values based on the ride control, such as a more or less aggressive throttle profile. Body Control Module The Body Control Module responds to the selected ride control by illuminating the appropriate ride control indicator on the Ride Control Switch. All indicators receive voltage via an indicator control circuit from a PWM high side driver in the Body Control Module . Ground to each indicator is individually controlled by a Body Control Module low side driver via a control circuit. For the selected ride control, the Body Control Module will ground the appropriate control circuit and the indicator will illuminate.