SECURITY LIGHT: 14, DTC: B1602[IMMOBILIZER SYSTEM (PATS) (L3)]


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Detection Condition

•  The PCM cannot read key ID number data normally.

Possible Cause

•  Transponder (key) malfunction
•  Coil malfunction
•  PCM malfunction
•  Communication error
―  If any of the following items are touching or near the key head, the ignition key cannot communicate with the vehicle properly and the engine cannot be started.
•  Any metallic object
•  Spare keys or ones for other vehicles equipped with an immobilizer system
•  Any electronic device, or credit or other cards with magnetic strips
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Diagnostic Procedure

STEP

INSPECTION

ACTION

1
VERIFY WHETHER KEY IS VALID OR NOT
•  Using another programmed key, turn the ignition switch to the ON position.
•  If there is no other programmed key, program an additional key using the M-MDS and turn the ignition key to the ON position using the programmed key.
•  Is the DTC displayed again?
―  Security light: 14
―  M-MDS: B1602
Yes
Replace the coil antenna, then go to the next step.
No
•  Dispose of the malfunctioning key.
•  Program a new key if necessary.
2
INSPECT THE PCM
•  Using another programmed key, turn the ignition switch to the ON position.
•  Is the DTC displayed again?
―  Security light: 14
―  M-MDS: B1602
Yes
Replace the PCM and perform the resetting procedure for the immobilizer system when replacing the PCM.
No
DTC inspection completed.