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• When Monitored: • Set Condition: Possible Causes INTERMITTENT CAN B BUS CIRCUIT DTC CAN B BUS DTCs SET IN FRONT CONTROL MODULE (D55) CAN B BUS (+) CIRCUIT OPEN (D54) CAN B BUS (-) CIRCUIT OPEN STEERING CONTROL MODULE (SCM) Diagnostic Test 1. DTC IS ACTIVE Ignition on, engine not running. With the scan tool, select Clear Stored DTCs in the Steering Control Module. Cycle the ignition from off to on at least 5 times, leaving the ignition on for a minimum of 90 seconds per cycle. With the Scan Tool, select View DTCs in the Steering Control Module. Does the DTC reset and/or remain active? Yes >> Go to 2 No >> Go to 6 2. CAN B BUS DTCs SET IN FRONT CONTROL MODULE With the Scan Tool, select View DTCs in the Front Control Module (FCM). Are there any active CAN B Bus DTCs? Yes >> Refer to 8 — ELECTRICAL/ELECTRONIC CONTROL MODULES — DIAGNOSIS AND TESTING for diagnostic procedures and for further possible causes. No >> Go to 3 3. (D55) CAN B BUS (+) CIRCUIT OPEN Turn the ignition off. Disconnect the Steering Control Module harness connector. Disconnect the Front Control Module C1 harness connector. Measure the resistance of the (D55) CAN B Bus (+) circuit between the Steering Control Module harness connector Is the resistance above 2.0 ohms? Yes >> Repair the (D55) CAN B Bus (+) circuit for an open. No >> Go to 4 19 - 102 COLUMN ELECTRICAL DIAGNOSIS LX |