• Always use the M-MDS to verify DTCs even if the security light displays a DTC. If the security light itself has a malfunction, it is possible that a DTC may not be properly displayed. There are certain DTCs which can only be verified using the M-MDS, not the security light.
• DTCs for the immobilizer system that are stored in the keyless unit and PCM are cleared when the ignition switch is turned from the ON to the LOCK (ACC) position.
• If DTCs are not displayed even though the engine does not start or stalls, perform the following symptom troubleshooting:
-
• The following conditions may cause poor signal communication between the key and vehicle, resulting in the engine not starting or a key registration error. Do not perform any work under the following conditions:
-
― If any of the following items are touching or near the key head.
-
• Spare keys
• Keys for other vehicles equipped with an immobilizer system
• Any metallic object
• Any electronic device, or any credit or other cards with magnetic strips