SECURITY LIGHT: 13, DTC: B2431[IMMOBILIZER SYSTEM (PATS) (L3)]

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Detection Condition

•  Key ID number program error

Possible Cause

•  Errors during key ID number program procedure
•  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 THE DTC USING THE M-MDS
•  Is DTC B2431 displayed?
Yes
Go to Step 3.
No
Go to the next step.
2
VERIFY THE DTC USING THE M-MDS
•  Is DTC B1600 displayed?
Yes
Perform “SECURITY LIGHT: 13, M-MDS: B1600.”
(See SECURITY LIGHT: 13, DTC: B1600[IMMOBILIZER SYSTEM (PATS) (L3)].)
No
Go to the next step.
3
INSPECT THE PCM
•  Using the M-MDS, clear the key ID number and re-program it.
•  Using the programmed key, turn the ignition switch to the ON position.
•  Verify the DTC using the M-MDS.
―  Is DTC B2431 displayed again?
Yes
Replace the PCM and perform the resetting procedure for the immobilizer system when replacing the PCM.
(See IMMOBILIZER SYSTEM (PATS) KEY ADDITION/CLEARING[L3].)
No
DTC inspection completed.