Engine Immobilizer Systems: Description
WARNING:
Read service precautions before proceeding with any service procedure on engine immobilizer system. See SERVICE PRECAUTIONS .
NOTE:
Before performing service procedures, check for any related Technical Service Bulletins (TSBs).
WARNING:
Vehicle is equipped with air bag supplement restraint system. Before attempting ANY repairs involving steering column, instrument panel or related components, see SERVICE PRECAUTIONS and DISABLING & ACTIVATING AIR BAG SYSTEM in appropriate AIR BAG RESTRAINT SYSTEMS article.
NOTE:
Engine immobilizer system may also be referred to as Hybrid Vehicle (HV) immobilizer system.
Engine immobilizer system is a theft deterrent system that disables hybrid system and prevents engine from starting by not allowing fuel injector and ignition system operation unless ignition key identification code matches code stored in Hybrid Vehicle (HV) control Electronic Control Unit (ECU). Hybrid vehicle control ECU may also be referred to as HV ECU. Engine immobilizer system consists of ignition key with built-in transponder chip, transponder key Electronic Control Unit (ECU), hybrid vehicle control ECU, key unlock warning switch and transponder key coil. See Fig 1.