For 1990-2009 cars

The Computer Command Ride (CCR) system controls the firmness of the vehicle's ride by automatically controlling an actuator in each of the four struts to increase ride firmness as speed increases. The three damping modes are Comfort, Normal, and Sport. Damping mode selection is controlled by the CCR Control Module according to vehicle speed conditions, vehicle accelerator input, driver select switch position, and any error conditions which may exist.

### System Components

#### Control Module

The CCR Control Module is a computer used to control and monitor the system. It is located on a bracket under the driver's seat. The Control Module receives driver select switch, speed, and accelerator inputs and determines the optimum mode strut valving for current operating conditions. The module also receives feedback from the struts to determine proper system operation. If the module receives an incorrect feedback signal, an error code will be set in the Control Module and both driver select switch light emitting diodes (L.E.D.s) will illuminate to display the error condition. For diagnostic purposes, grounding the Diagnostic Enable circuit will cause both driver select switch L.E.D.s to flash error codes.

#### Struts

Each strut contains an electrical actuator which rotates a selector valve to a specific location commanded by the Control Module. The selector valve contains different sized orifices which will increase or decrease the damping rate of the strut to control ride firmness. Actuators are an integral part of the strut and are not serviceable separately from the strut.

### System Inputs and Outputs

#### Driver Select Switch Input

The driver select switch determines the operating mode of the system as follows:

• | In the TOURING RIDE switch position, the damping level depends on vehicle speed and accelerometer inputs.

• | In the PERFORM RIDE switch position, the system will place the damping level in the Firm mode regardless of vehicle speed and accelerometer inputs.

#### Speed Input

In the TOURING RIDE switch position, ride firmness is determined by the following speed conditions:

• | Speed increasing and below 6 mph (Stationary) - Sport mode.

• | Speed increasing and between 6 and 36 mph - Comfort mode.

• | Speed increasing and between 36 and 79 mph - Normal mode.

• | Speed increasing and above 79 mph - Sport mode.

• | Speed decreasing and above 76 mph - Sport mode.

• | Speed decreasing and between 76 and 32 mph - Normal mode.

• | Speed decreasing and between 32 and 2 mph - Comfort mode.

• | Speed decreasing and below 2 mph - Sport mode.

#### Accelerator Input

The accelerometer input is used for lift, dive, and roll control with the driver select switch in the NORMAL position. The Firm mode will be selected if the accelerometer input is activated by lift, dive or roll conditions. The system returns to its speed dependent mode 2 seconds after the accelerometer input returns to the inactive state.

#### Driver Select Switch L.E.D. Feedback

Any system error will cause both driver select switch L.E.D.s to be illuminated. The error display will exist as long as the error code is active. If the fault corrects itself, the L.E.D.s will no longer display the error condition, but the error code will be retained in the Control Module memory. Error codes are stored in the Control Module in non-volatile (EEPROM) memory.

If the L.E.D.s are not displaying an error condition, one or the other will be on to follow the driver select switch position, in Normal position and the system is in the Firm mode due to accelerometer input, the Firm L.E.D. will illuminate to show a shift to the Firm mode. The Normal L.E.D. then will turn back on when the system returns to the Comfort mode.

If a code is set, a one second self diagnostic test is performed at three minute intervals and whenever the driver select switch position is changed. Both L.E.D.s will be on during this test and will go out if the fault is corrected. If the fault still exists, the L.E.D.s will remain on.