SECURITY LIGHT: 15, DTC: B1601[IMMOBILIZER SYSTEM (PATS) (L3)]

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Detection Condition

• The PCM has detected unprogrammed key ID number.

Possible Cause

• No keys have been programmed after replacing the PCM.

• Unprogrammed key used

• Attempt made to program a ninth key

• PCM malfunction

Diagnostic Procedure

STEP

INSPECTION

ACTION

1

VERIFY NUMBER OF PROGRAMMED KEYS

•  Using the M-MDS, perform the PID/data monitor inspection and confirm the number of programmed keys.
(See PID/DATA MONITOR TABLE[IMMOBILIZER SYSTEM (PATS) (L3)].)

•  Are one or more keys programmed?

Yes

Go to the next step.

No

Go to Step 3.

2

VERIFY NUMBER OF PROGRAMMED KEYS

•  Using the M-MDS, perform the PID/data monitor inspection and confirm the number of programmed keys.
(See PID/DATA MONITOR TABLE[IMMOBILIZER SYSTEM (PATS) (L3)].)

•  Are eight keys programmed?

Yes

Using the M-MDS, clear the key ID numbers if necessary, then go to the next step.

No

Go to the next step.

3

INSPECT THE PCM

•  Using the M-MDS, program the key ID number.
(See IMMOBILIZER SYSTEM (PATS) KEY ADDITION/CLEARING[L3].)

•  Using the programmed key, turn the ignition switch to the ON position.

•  Is the DTC displayed again?

―  Security light: 15

―  M-MDS: B1601

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 NUMBER OF PROGRAMMED KEYS • Using the M-MDS, perform the PID/data monitor inspection and confirm the number of programmed keys. (See PID/DATA MONITOR TABLE[IMMOBILIZER SYSTEM (PATS) (L3)].) • Are one or more keys programmed?	Yes	Go to the next step.
1		No	Go to Step 3.
2	VERIFY NUMBER OF PROGRAMMED KEYS • Using the M-MDS, perform the PID/data monitor inspection and confirm the number of programmed keys. (See PID/DATA MONITOR TABLE[IMMOBILIZER SYSTEM (PATS) (L3)].) • Are eight keys programmed?	Yes	Using the M-MDS, clear the key ID numbers if necessary, then go to the next step.
2		No	Go to the next step.
3	INSPECT THE PCM • Using the M-MDS, program the key ID number. (See IMMOBILIZER SYSTEM (PATS) KEY ADDITION/CLEARING[L3].) • Using the programmed key, turn the ignition switch to the ON position. • Is the DTC displayed again? ― Security light: 15 ― M-MDS: B1601	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].)
3		No	DTC inspection completed.