SYSTEM DESCRIPTION
1. ENGINE IMMOBILISER SYSTEM DESCRIPTION
(a) The engine immobiliser system is designed to prevent the vehicle from being stolen. This system uses a transponder key ECU assembly that stores the key codes of authorized ignition keys. If an attempt is made to start the engine using an unauthorized key, the ECU sends a signal to the ECM to prohibit fuel delivery and ignition, effectively disabling the engine.
2. FUNCTION OF MAIN COMPONENT
Component |
Outline |
---|---|
Transponder key amplifier |
When the key is inserted into the ignition key cylinder, the antenna coil receives the key code. Then the amplifier amplifies the ID code and outputs it to the transponder key ECU assembly. |
Unlock warning switch assembly |
Detects whether the key is in the ignition key cylinder and outputs the results to the transponder key ECU assembly. |
Security indicator light |
Depending on the operation of the transponder key ECU assembly, the security indicator light turns off or starts blinking. |
Transponder key ECU assembly |
Checks the ID code received from the transponder key amplifier and if the results match, an EFI operation permission signal is sent through the SFI communication. |
ECM |
Through the SFI communication, the ECM receives the ID verification results from the transponder key ECU assembly. The ECM also verifies the ECUs. Then the judgment of whether or not to disable engine is made. |
3. SYSTEM FUNCTION
(a) When the transponder key ECU assembly detects that the unlock warning switch assembly is on, the transponder key ECU assembly provides current to the antenna coil and produces a weak electric wave. A transponder chip in the key grip receives the electric wave. Upon receiving the electric wave, the transponder chip outputs a key ID code signal. The transponder key coil receives this signal, the signal is amplified by the transponder key amplifier and the signal is transmitted to the transponder key ECU assembly.
(b) The transponder key ECU assembly matches the key ID code with the vehicle ID code, which was previously registered in the transponder key ECU assembly, and communicates the results to the ECM. After the identification results show that the key ID code matches the vehicle ID code and the transponder key ECU assembly has confirmed their match: 1) the engine immobiliser system is canceled and the engine starting controls (fuel injection control and ignition control) enter standby mode; and 2) the transponder key ECU assembly transmits a security indicator light signal that communicates "indicator off" to the combination meter assembly (security indicator light) and the security indicator light turns off.
(c) The security indicator light pattern is as shown below (when changing from the immobiliser set state to the unset state).
Speed Signal Malfunction (B15C2)
DESCRIPTION
The navigation receiver assembly receives a vehicle speed signal from the combination
meter assembly and information from the navigation antenna assembly, and then adjusts
the vehicle position.
The navigation receiver assembly stores this DTC ...
Removal
REMOVAL
PROCEDURE
1. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL
CAUTION:
Wait at least 90 seconds after disconnecting the cable from the negative (-)
battery terminal to disable the SRS system.
NOTICE:
When disconnecting the cable, some systems ne ...