For a complete wiring diagram Refer to Section 8WWhen Monitored:Continuously while the system is active.Set Condition:An error message has been received over the bus from the Steering Control Module (SCM).Possible CausesINTERMITTENT DTCCAN BUS OPEN OR SHORTED CONDITIONSTEERING CONTROL MODULE (SCM)ENGINE CONTROL MODULE (ECM)Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding.(Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)1. ACTIVE DTCDiagnose all CAN B and C communication DTCs before continuing.Ignition on, engine not running.With a scan tool, view DTCs.Is the status Active for this DTC?YesGo To 2 NoRefer to the INTERMITTENT CONDITION Diagnostic Procedure.(Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)2. SCM COMMUNICATION RELATED DTC'S IN OTHER MODULESWith a scan tool check for SCM communication related DTCs in other modules on the CAN Bus.Are there any SCM communication related DTCs in other modules on the CAN Bus at this time?YesReplace and program the Steering Control Module (SCM) in accordance with the Service Information.Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - STANDARD PROCEDURE)NoReplace and program the Engine Control Module (ECM) in accordance with the Service Information.Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - STANDARD PROCEDURE)