C1744

CIRCUIT DESCRIPTION
The CVRSS control module receives a lift/dive signal from the Powertrain Control Module (PCM). Under normal condition this signal is 5 volts. The PCM grounds this circuit when the vehicle is accelerating rapidly (LIFT) or braking hard (DIVE). When the lift/dive signal goes low (approximately 0 volts), the CVRSS control module commands all four CVRSS dampers to a FIRM condition.

CONDITION FOR SETTING THE CODE "CURRENT"
The CVRSS control module does not sense the low-to-high transition on the lift/dive line within 31 seconds after the ignition is turned ON.

ACTIONS TAKEN WHEN CODE SETS
^ The CVRSS lift/dive function will be disabled.
Vehicle will pitch more during a braking or wide open throttle condition.
^ "SERVICE RIDE CONTROL" message will be displayed.

CONDITION FOR CODE TURNING "HISTORY"
The CVRSS control module senses the low-to-high transition on the lift/dive signal from the PCM during a valid test period.

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 to see if related PCM code is set.
3. Checks for proper voltage at CVRSS module with the signal not active.
4. Manually activating the "lift/dive" signal (circuit should be at 0 volts).
5. Saving system information and checking for an open circuit in circuit 1490.
8. Saving system information and checking for shorts to ground in circuit 1490.
10. Checking for a short to battery (voltage) in circuit 1490.

DIAGNOSTIC AIDS
As part of the vehicle diagnostic system, the PCM toggles the lift/dive line within 31 seconds after the ignition is turned ON. This allows the CVRSS module to determine if the line is faulted or not. A retry is attempted every four minutes until successful.

An intermittent short to ground or open on circuit 1490 may cause a random firm/soft ride condition.