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U0020-CAN B BUS OFF PERFORMANCE (CONTINUED) • When Monitored: • Set Condition: Possible Causes CAN B BUS DTCs IN FRONT CONTROL MODULE (D54) CAN B BUS (–) CIRCUIT OPEN (D55) CAN B BUS (+) CIRCUIT OPEN AMPLIFIER Diagnostic Test 1. TEST FOR INTERMITTENT CONDITION Turn the ignition on. With the scan tool, record and erase DTCs Cycle the ignition from on to off 3 times. Turn the ignition on. With the scan tool, read DTCs. Does the scan tool display U0020-CAN B BUS OFF PERFOR- Yes >> Go To 2 No >> The conditions that caused this code to set are not present at this time. Using the wiring diagram/schematic Perform BODY VERIFICATION TEST - VER 1. 2. CHECK FRONT CONTROL MODULE DTCs With the scan tool, read Front Control Module DTCs Does the scan tool display any CAN B BUS DTCs – ACTIVE? Yes >> Refer to the symptom list for problems related to Commu- nication in the ELECTRICAL.– ELECTRONIC CONTROL No >> Go to 3 8A - 148 AUDIO/VIDEO SYSTEMS - ELECTRICAL DIAGNOSIS WK |