Description Of Functions

WARNING: This page is about a different car, the 2014 Subaru BRZ. However, it is still accessible from the selected car via links, so may be relevant.

Description of engine immobilizer system
1. The engine immobilizer system judges the EFI system starting capability, based on the key ID code and the code already registered to the vehicle. The engine immobilizer system compares the ID code registered in vehicle collation ECM (smart key ECM ASSY) with the transponder chip ID code built in the electrical key transmitter SUB-ASSY. If these ID codes do not match, the engine immobilizer system operates and EFI system can not be started. The collation ECM (smart key ECM ASSY) controls the communication with the EFI system, steering lock actuator ASSY (steering lock ECM), ID code box (immobilizer code ECM)*. If ID codes of the transponder chip and ECM (smart key ECM ASSY) match, the collation ECM (smart key ECM ASSY) permits the EFI system starting.
  *: The ID code box is included.
System functions
1. Push button start function
  1. When the driver (or passenger) enters inside the vehicle while holding the electrical key transmitter SUB-ASSY, and depresses the brake pedal*1 or clutch pedal*2, the collation ECM (smart key ECM ASSY) recognizes that the brake pedal*1 or clutch pedal*2 is depressed, and sends the electrical key transmitter SUB-ASSY collation request signal to the inside vehicle electrical key antenna. When the request signal is received, the inside vehicle electrical key antenna sends other signal to detect whether the electrical key transmitter SUB-ASSY is inside the vehicle. When the electrical key transmitter SUB-ASSY receives this request signal, it returns the ID code including the response code. The ID code sent from the electrical key transmitter SUB-ASSY is sent to the collation ECM (smart key ECM ASSY) via the door control receiver. When the ID code is received, the collation ECM (smart key ECM ASSY) analyzes the code. If the collation result is normal, the entry key indicator light in the combination meter ASSY illuminates in green. When the indicator lights up green and the driver pushes the engine switch, the collation ECM (smart key ECM ASSY) recognizes the engine start signal, and turns on the ACC relay and IG1 relay and IG2 relay respectively. At this time, it recognizes that the power supply mode of the collation ECM (smart key ECM ASSY) has been changed, and sends the electrical power to the steering lock actuator. Then, (via the ID code box (immobilizer code ECM))*3 the steering lock actuator ASSY (steering lock ECM) recognizes that the collation ECM (smart key ECM ASSY) is the suitable ECM and drives the steering actuator motor until the steering lock unlocks. When the steering lock is unlocked, the steering lock actuator ASSY (steering lock ECM) transmits an unlock completion signal to the collation ECM (smart key ECM ASSY). If there is an ID code box, when this signal is received, the collation ECM (smart key ECM ASSY) sends the immobilizer not set command signal to the ID code box (immobilizer code ECM). When this signal is received, the ID code box (immobilizer code ECM) sends the immobilizer not set command signal to the EFI system after confirming that the collation ECM (smart key ECM ASSY) is the suitable ECM. If there is no ID code box, when this signal is received, the collation ECM sends the immobilizer not set command signal to the EFI system.
  *1: With automatic transmission
  
  *2: for manual transmission
  
  *3: The ID code box is included.
  
  *4: The ID code box is not included.