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U1107–ECU IN SINGLE–WIRE MODE – HSM (CONTINUED) For a complete wiring diagram Refer to Section 8W. • When Monitored: • Set Condition: Possible Causes CAN B BUS DTC’s IN FRONT CONTROL MODULE (D54) CAN B BUS (–) CIRCUIT OPEN (D55) CAN B BUS (+) CIRCUIT OPEN HEATED SEAT MODULE Diagnostic Test 1. TEST FOR INTERMITTENT CONDITION Turn the ignition on. With the scan tool, record and erase DTC’s Cycle the ignition from on to off 3 times. Turn the ignition on. With the scan tool, read DTC’s. Does the scan tool display U1107 ECU IN SINGLE-WIRE MODE? Yes >> Go To 2 No >> The conditions that caused this code to set are not present at this time. Using the wiring diagram/sche- matic as a guide, inspect the wiring and connectors. 2. CHECK FRONT CONTROL MODULE DTC’s With the scan tool, read Front Control Module DTC’s Does the scan tool display any CAN B BUS DTC’s – ACTIVE? Yes >> Refer to the symptom list for problems related to Communication in the ELECTRICAL.– ELECTRONIC CONTROL MODULES – ELECTRICAL DIAGNOSES section. No >> Go to 3 8G - 54 HEATED SEATS - ELECTRICAL DIAGNOSTICS WK |