C1787

CIRCUIT DESCRIPTION
The high-side (battery) voltage for the Continuously Variable Road Sensing Suspension (CVRSS) damper actuators is supplied to the CVRSS control module through the CVRSS Damper Control Relay ("RTD BODY") circuit. The Damper Control Relay circuit is controlled by the CVRSS module. The CVRSS control module monitors the relay drive circuit and each damper actuator high-side and low-side drive circuits for fault conditions.

CONDITION FOR SETTING THE CODE "CURRENT"
The CVRSS control module measures a feedback voltage less than a preset threshold during a damper relay OFF state.

ACTIONS TAKEN WHEN CODE SETS "CURRENT"
^ ALL damper actuators may be disabled by commanding 0% Pulse Width Modulated (PWM) duty cycle (Vehicle ride may be soft).
^ Vehicle speed may be limited.
^ The "SERVICE RIDE CONTROL" message may be displayed.

CONDITION FOR CODE TURNING "HISTORY"
The CVRSS control module no longer senses a low feedback voltage during a damper relay OFF state.

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 blown "RSS" fuse.
3. Checks for an open in circuit 2240C.
4. Checks the resistance of relay coil.
5. Checks for an open in circuit 1112.
6. Checks for a short to ground in circuit 1112.
7. Checks for a short to ground in circuit 2240 and 998.