SECURITY LIGHT: 11, DTC: B1681/P1260/P1260:00 [IMMOBILIZER SYSTEM (ADVANCED KEYLESS ENTRY AND START SYSTEM)]

id09021h001600

SECURITY LIGHT: 11

No detected communication with the coil antenna

DTC: B1681/P1260/P1260:00

DETECTION CONDITION

No detected communication with the coil antenna

POSSIBLE CAUSE

•  Coil antenna malfunction

•  Keyless control module malfunction

•  Malfunction in the related wiring harnesses

Diagnostic Procedure

STEP

INSPECTION

ACTION

1

INSPECT COIL ANTENNA POWER SUPPLY SYSTEM

•  Disconnect the coil antenna connector.

•  Turn the ignition switch to the ON position.

•  Measure the voltage at coil antenna terminal D.

•  Is the voltage 8 V or more?

Yes

Go to the next step.

No

Repair the wiring harness.

2

INSPECT WIRING HARNESS BETWEEN COIL ANTENNA AND GROUND

•  Turn the ignition switch to the LOCK position.

•  Inspect the wiring harness between coil antenna terminal C and ground for the following:

―  Short to power supply

―  Open circuit

•  Is the wiring harness normal?

Yes

Go to the next step.

No

Repair the wiring harness.

3

INSPECT COIL ANTENNA INPUT SIGNAL CIRCUIT

•  Connect the coil antenna connector.

•  Turn the ignition switch to the ON position.

•  Measure the voltage at coil antenna terminal B.

•  Is the voltage 8 V or more?

Yes

Go to Step 7.

No

Go to the next step.

4

INSPECT COIL ANTENNA INPUT SIGNAL CIRCUIT

•  Turn the ignition switch to the LOCK position.

•  Disconnect the keyless control module connector.

•  Turn the ignition switch to the ON position.

•  Measure the voltage at keyless control module terminal 3U.

•  Is the voltage 8 V or more?

Yes

Replace the keyless control module and perform the resetting procedure for the immobilizer system when replacing the keyless control module.

(See KEYLESS CONTROL MODULE REMOVAL/INSTALLATION [ADVANCED KEYLESS ENTRY AND START SYSTEM].)

(See IMMOBILIZER SYSTEM COMPONENT REPLACEMENT/KEY ADDITION AND CLEARING [ADVANCED KEYLESS ENTRY AND START SYSTEM].)

No

Go to the next step.

5

INSPECT COMMUNICATION CIRCUIT (INPUT) FOR CONTINUITY

•  Turn the ignition switch to the LOCK position.

•  Is there continuity between coil antenna terminal B and keyless control module terminal 3U?

Yes

Go to the next step.

No

Repair the wiring harness.

6

INSPECT COIL ANTENNA INPUT SIGNAL CIRCUIT

•  Measure the resistance between coil antenna terminal C and ground.

•  Is the resistance 10 kilohms or more?

Yes

Replace the coil antenna.

(See COIL ANTENNA REMOVAL/INSTALLATION.)

No

Repair the wiring harness.

7

INSPECT COIL ANTENNA OUTPUT SIGNAL CIRCUIT

•  Connect the coil antenna connector and the keyless control module connector.

•  Turn the ignition switch to the ON position.

•  Measure the voltage at coil antenna terminal A.

•  Is the voltage 8 V or more?

Yes

Replace the coil antenna.

(See COIL ANTENNA REMOVAL/INSTALLATION.)

No

Go to the next step.

8

INSPECT COIL ANTENNA OUTPUT SIGNAL CIRCUIT

•  Turn the ignition switch to the LOCK position.

•  Disconnect the coil antenna connector.

•  Turn the ignition switch to the ON position.

•  Measure the voltage at coil antenna terminal A.

•  Is the voltage 8 V or more?

Yes

Replace the coil antenna.

(See COIL ANTENNA REMOVAL/INSTALLATION.)

No

Go to the next step.

9

INSPECT COMMUNICATION CIRCUIT (OUTPUT) FOR CONTINUITY

•  Turn the ignition switch to the LOCK position.

•  Disconnect the keyless control module connector.

•  Is there continuity between coil antenna terminal A and keyless control module terminal 3V?

Yes

Go to the next step.

No

Repair the wiring harness.

10

INSPECT COIL ANTENNA OUTPUT SIGNAL CIRCUIT

•  Measure the resistance between keyless control module terminal 3V and ground.

•  Is the resistance 10 kilohms or more?

Yes

Replace the keyless control module and perform the resetting procedure for the immobilizer system when replacing the keyless control module.

(See KEYLESS CONTROL MODULE REMOVAL/INSTALLATION [ADVANCED KEYLESS ENTRY AND START SYSTEM].)

(See IMMOBILIZER SYSTEM COMPONENT REPLACEMENT/KEY ADDITION AND CLEARING [ADVANCED KEYLESS ENTRY AND START SYSTEM].)

No

Repair the wiring harness.

SECURITY LIGHT: 11	No detected communication with the coil antenna
DTC: B1681/P1260/P1260:00	No detected communication with the coil antenna
DETECTION CONDITION	No detected communication with the coil antenna
POSSIBLE CAUSE	• Coil antenna malfunction • Keyless control module malfunction • Malfunction in the related wiring harnesses

STEP	INSPECTION		ACTION
1	INSPECT COIL ANTENNA POWER SUPPLY SYSTEM • Disconnect the coil antenna connector. • Turn the ignition switch to the ON position. • Measure the voltage at coil antenna terminal D. • Is the voltage 8 V or more?	Yes	Go to the next step.
1		No	Repair the wiring harness.
2	INSPECT WIRING HARNESS BETWEEN COIL ANTENNA AND GROUND • Turn the ignition switch to the LOCK position. • Inspect the wiring harness between coil antenna terminal C and ground for the following: ― Short to power supply ― Open circuit • Is the wiring harness normal?	Yes	Go to the next step.
2		No	Repair the wiring harness.
3	INSPECT COIL ANTENNA INPUT SIGNAL CIRCUIT • Connect the coil antenna connector. • Turn the ignition switch to the ON position. • Measure the voltage at coil antenna terminal B. • Is the voltage 8 V or more?	Yes	Go to Step 7.
3		No	Go to the next step.
4	INSPECT COIL ANTENNA INPUT SIGNAL CIRCUIT • Turn the ignition switch to the LOCK position. • Disconnect the keyless control module connector. • Turn the ignition switch to the ON position. • Measure the voltage at keyless control module terminal 3U. • Is the voltage 8 V or more?	Yes	Replace the keyless control module and perform the resetting procedure for the immobilizer system when replacing the keyless control module. (See KEYLESS CONTROL MODULE REMOVAL/INSTALLATION [ADVANCED KEYLESS ENTRY AND START SYSTEM].) (See IMMOBILIZER SYSTEM COMPONENT REPLACEMENT/KEY ADDITION AND CLEARING [ADVANCED KEYLESS ENTRY AND START SYSTEM].)
4		No	Go to the next step.
5	INSPECT COMMUNICATION CIRCUIT (INPUT) FOR CONTINUITY • Turn the ignition switch to the LOCK position. • Is there continuity between coil antenna terminal B and keyless control module terminal 3U?	Yes	Go to the next step.
5		No	Repair the wiring harness.
6	INSPECT COIL ANTENNA INPUT SIGNAL CIRCUIT • Measure the resistance between coil antenna terminal C and ground. • Is the resistance 10 kilohms or more?	Yes	Replace the coil antenna. (See COIL ANTENNA REMOVAL/INSTALLATION.)
6		No	Repair the wiring harness.
7	INSPECT COIL ANTENNA OUTPUT SIGNAL CIRCUIT • Connect the coil antenna connector and the keyless control module connector. • Turn the ignition switch to the ON position. • Measure the voltage at coil antenna terminal A. • Is the voltage 8 V or more?	Yes	Replace the coil antenna. (See COIL ANTENNA REMOVAL/INSTALLATION.)
7		No	Go to the next step.
8	INSPECT COIL ANTENNA OUTPUT SIGNAL CIRCUIT • Turn the ignition switch to the LOCK position. • Disconnect the coil antenna connector. • Turn the ignition switch to the ON position. • Measure the voltage at coil antenna terminal A. • Is the voltage 8 V or more?	Yes	Replace the coil antenna. (See COIL ANTENNA REMOVAL/INSTALLATION.)
8		No	Go to the next step.
9	INSPECT COMMUNICATION CIRCUIT (OUTPUT) FOR CONTINUITY • Turn the ignition switch to the LOCK position. • Disconnect the keyless control module connector. • Is there continuity between coil antenna terminal A and keyless control module terminal 3V?	Yes	Go to the next step.
9		No	Repair the wiring harness.
10	INSPECT COIL ANTENNA OUTPUT SIGNAL CIRCUIT • Measure the resistance between keyless control module terminal 3V and ground. • Is the resistance 10 kilohms or more?	Yes	Replace the keyless control module and perform the resetting procedure for the immobilizer system when replacing the keyless control module. (See KEYLESS CONTROL MODULE REMOVAL/INSTALLATION [ADVANCED KEYLESS ENTRY AND START SYSTEM].) (See IMMOBILIZER SYSTEM COMPONENT REPLACEMENT/KEY ADDITION AND CLEARING [ADVANCED KEYLESS ENTRY AND START SYSTEM].)
10		No	Repair the wiring harness.