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• When Monitored: • Set Condition: Possible Causes CAN B BUS DTC’s IN FRONT CONTROL MODULE (D55) CAN B BUS (+) CIRCUIT OPEN (D54) CAN B BUS (-) CIRCUIT OPEN SKREEM Diagnostic Test 1. CHECK FOR ACTIVE DTC’s With the scan tool, read the active DTC’s. Cycle the ignition switch from off to on at least 5 times, leaving the ignition on for a minimum of 90 seconds per With the scan tool, read the active DTC’s. Does the scan tool display this DTC as active? Yes >> Go To 2 No >> If the DTC is stored, check for an intermittent condition. Visually inspect the related wiring harness con- nectors. Look for broken, bent, pushed out, or corroded terminals. 2. CHECK FRONT CONTROL MODULE DTC’s With the scan tool, read Front Control Module active DTC’s Does the scan tool display any CAN B BUS DTC’s - ACTIVE? Yes >> Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - DIAGNOSIS AND TESTING. No >> Go To 3 3. (D55) CAN B BUS (+) CIRCUIT OPEN Turn the ignition off. Disconnect the negative battery cable. Disconnect the SKREEM connector. Disconnect the Front Control Module connector. Measure the resistance of the (D55) CAN B Bus (+) circuit between the Front Control Module harness connector Is the resistance below 2.0 ohms? Yes >> Go To 4 No >> Repair the (D55) CAN B Bus (+) circuit for an open. Perform BODY VERIFICATION TEST - VER 1. 8Q - 108 VEHICLE THEFT SECURITY - ELECTRICAL DIAGNOSTICS LX |