C1716

CIRCUIT DESCRIPTION
The RF damper actuator is driven by the Continuously Variable Road Sensing Suspension (CVRSS) control module via a method known as Pulse Width Modulation (PWM). Battery voltage is PWMed (switched on and off) at a high frequency (2.0 kHz), thus controlling the amount of current delivered to the actuator. By controlling the amount of current to the actuator the CVRSS control module can then control the damping force in the damper. A higher level of damping force is achieved by providing correspondingly higher current levels, relating to higher percentages of PWM duty cycle.

The default damper state (with no battery voltage, and thus no current, provided to the attached actuator) is one that provides a minimum damping force.

CONDITION FOR SETTING THE CODE "CURRENT"
The CVRSS control module measures a feedback voltage lower than a preset value during two consecutive OFF-state damper diagnostic test procedures.

The CVRSS control module performs a test procedure on each damper actuator approximately every 16 seconds. During this test procedure the damper actuator is briefly energized (ON-state test) and de-energized (OFF-state test). If, twice consecutively, the feedback voltage during the OFF-state test is below the fault threshold, the corresponding code is set.

ACTIONS TAKEN WHEN CODE SETS
^ "SERVICE RIDE CONTROL" message will be displayed.
^ ALL damper actuators will be disabled by commanding 0% PWM duty cycle.
^ Vehicle speed will be limited.
^ Vehicle ride will be soft.

CONDITION FOR CODE TURNING "HISTORY"
When the CVRSS control module no longer senses a short to ground on the damper low-side drive.

HOW TO CLEAR THE CODE
^ Use the scan tool.
^ Use the On-Board diagnostic "CLEAR RSS CODES" feature.

TEST DESCRIPTION
The numbers below refer to step numbers on the diagnostic table.
2. Checks for a fault in the damper relay ("RTD Body" Relay) circuit.
3. Checks for an internal open in the actuator.
4. Checks for short to ground on the actuator pigtail harness.
5. Checks CVRSS actuator harness (circuit 1117BX) for a short to ground with the actuator disconnected.

Important: Intermittent connections in circuits 2240, 1112, or 998 or with the "RTD Body" relay may cause this code to set. If this code is displayed as "HISTORY," look for intermittents in circuits 2240, 1112 or 998 or the "RTD Body" Relay.