New Transponder Key Code

NOTE: This must be done when a new ECM is installed. The new ECM is in automatic key code registration mode. Up to 3 key codes can be registered at one time. In automatic registration mode, last key registered becomes sub-key.

NOTE: Master key is a Black key that opens all locks. Sub-key is a Gray key that will not open trunk, trunk main switch and glove box.

Security indicator will flash until first key is inserted into ignition switch. Insert NEW key in ignition switch. Security indicator should illuminate.
Once key registration is under way, security indicator should turn off. After key registration is complete, security indicator should illuminate. Remove NEW key.
If programming additional keys, repeat process starting with step 1. If additional keys do not need programming, procedure is complete. Security indicator should go out once last key (sub-key) is registered. Depress and release brake pedal at least 5 times, or request automatic registration mode completion using LEXUS scan tool.
After registration is complete and system is operating normally, when ignition key is removed from ignition lock cylinder, security indicator should flash indicating system is properly functioning. If a key is not inserted into ignition switch with ECM in automatic registration mode, security indicator will remain illuminated indicating keys have not been registered. If ignition key registration cannot be completed with Engine Control Module (ECM) in automatic registration mode, a code 2-1 will be displayed by security indicator, and when inserting the already registered ignition key, a code 2-2 will be displayed by security indicator.