C1786

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. DTC C1786 is used to detect a fault condition with the damper control relay contacts or associated wiring.

CONDITIONS FOR SETTING THE DTC
The Diagnostic Trouble Code (DTC) is set when there is a loss of battery voltage on pin D1 of the CVRSS control module. The DTC turns HISTORY when the CVRSS control module senses a battery voltage at pin D1 after the ignition has been cycled.

ACTION TAKEN WHEN THE DTC SETS
^ ALL the damper actuators will be disabled by commanding 0% Pulse Width Modulated (PWM) duty cycle. The vehicle ride will be soft.
^ The vehicle speed will be limited.
^ The SERVICE RIDE CONTROL message will be displayed.

CONDITIONS FOR CLEARING THE MIL/DTC
^ Use the scan tool.
^ Use the On-Board diagnostic CLEAR RSS CODES feature.

TEST DESCRIPTION
The number(s) below refer to the step number(s) on the diagnostic table.
1. This step checks the contacts of the relay for proper operation.
2. This step checks circuit 2240B for an open circuit condition.
3. This step checks circuit 998 for an open circuit condition.

Do not backprobe the sensors, actuators, or any sealed connectors.