Multiplex Control Systems: Self-Diagnostics: Notes

WARNING: Deactivate air bag system before performing any service operation. See AIR BAG RESTRAINT SYSTEMS article. DO NOT apply electrical power to any component on steering column without first deactivating air bag system. Air bag may deploy.

When diagnosing multiplex control system, perform INSTRUMENT ECU and OPEN DOOR INDICATOR LIGHT inspection procedures first to ensure DTCs can be retrieved. See PRELIMINARY INSPECTION .