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.
(See IMMOBILIZER SYSTEM (PATS) KEY ADDITION/CLEARING[L3].)

•  Is the DTC displayed again?

―  Security light: 14

―  M-MDS: B1602

Yes

Replace the coil antenna, then go to the next step.

(See COIL ANTENNA REMOVAL/INSTALLATION.)

No

•  Dispose of the malfunctioning key.

•  Program a new key if necessary.
(See IMMOBILIZER SYSTEM (PATS) KEY ADDITION/CLEARING[L3].)

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.

(See IMMOBILIZER SYSTEM (PATS) KEY ADDITION/CLEARING[L3].)

No

DTC inspection completed.

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. (See IMMOBILIZER SYSTEM (PATS) KEY ADDITION/CLEARING[L3].) • Is the DTC displayed again? ― Security light: 14 ― M-MDS: B1602	Yes	Replace the coil antenna, then go to the next step. (See COIL ANTENNA REMOVAL/INSTALLATION.)
1		No	• Dispose of the malfunctioning key. • Program a new key if necessary. (See IMMOBILIZER SYSTEM (PATS) KEY ADDITION/CLEARING[L3].)
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. (See IMMOBILIZER SYSTEM (PATS) KEY ADDITION/CLEARING[L3].)
2		No	DTC inspection completed.