Diagnosis By Symptom - CVRSS

"NO RSS DATA" LOSS OF CVRSS SERIAL COMMUNICATIONS OR POWER

Part 1 Of 2:

Part 2 Of 2:

CIRCUIT DESCRIPTION
The Continuously Variable Road Sensing Suspension (CVRSS) control module communicates to other electronic control modules on the vehicle via the CLASS 2 serial bus.

CONDITION FOR SETTING THE CODE "CURRENT"
1. Power to the CVRSS control module has been lost because of one or more of the following:
^ Loss of battery feed (loose terminals, fuses).
^ Loss of ignition feed (loose terminals, fuses).
^ Loss of a good CVRSS system ground.
^ Internal CVRSS control module malfunction.
2. The CVRSS control module is powered and operational, but is unable to communicate with the Instrument Panel Cluster (IPC) because of the following:
^ Open circuit, short to ground, or short to voltage on the CLASS 2 circuit.

ACTIONS TAKEN WHEN CODE SETS
^ The "SERVICE RIDE CONTROL" message will be displayed.
^ The vehicle speed may be limited, or the "STABILITY REDUCED" message will be displayed.
^ Codes PI 611, U1056 and/or U1255 could be stored.

CONDITION FOR CODE TURNING "HISTORY"
When the IPC can communicate with the CVRSS control module.

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 blown ignition fuse.
3. Checks for blown battery fuse.
4. Checks for an open in ground circuit.
5. Checks for an open in battery circuit.
7. Checks for an open in ignition circuit.
9. Checks CLASS 2 bus for a fault condition.
12. Checks for a short to ground on ignition circuit.
13. Checks for a short to ground on battery circuit.

Important: Codes P1611, U1056, and U1255 can also be a result of:
1. Electrical problems with the wiring harness.
2. Intermittent breaks in Class 2 Communication caused by other controllers and/or wiring harness issues.