I039

I039 LOSS OF ROAD SENSING SUSPENSION (RSS) DATA

Diagnostic Chart:

Wiring Diagram:

CIRCUIT DESCRIPTION
Code I039 will set if the ignition is on and the IPC is not able to exchange data with the Road Sensing Suspension (RSS) module (if any other communication codes are stored along with I039, see the chart of "MULTIPLE INTERMITTENT CODES"). Multiple Data Communication Codes When this is the only communication code stored, the problem must be one of the following:
^ An open in CKT 800 between the Electronic Brake and Traction Control Module (EBTCM) and RSS module and an open in CKT 800 between the RSS module and A/C programmer (ACP).
^ An open or short in the RSS module power or ground circuits.
^ A faulty RSS module.

During the time the failure is present, no RSS diagnostic information will be available for display. The "SERVICE RIDE CONTROL" message will be displayed on the IPC. Also, while in the service diagnostic mode, this code will remain active, always checking for proper operations.

TEST DESCRIPTION
Test numbers refer to circled numbers on the diagnostic chart.
1. First check that the code is not intermittent.
2. This step checks if the data line fault is in CKT 800 or at the RSS module.

NOTES ON INTERMITTENTS
If only code I039 is stored as "History", check RSS power, ground and serial data CKT's.