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

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SECURITY LIGHT: 11

No detected communication with the coil antenna

DTC: B1681/P1260

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 THE FUSE

•  Turn the ignition switch to the LOCK position.

•  Remove the METER 10 A fuse.

•  Is the fuse normal?

Yes

Go to the next step.

No

Replace the fuse, then go to next step.

2

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.

3

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.

4

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 the next step.

No

Go to Step 7.

5

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 programming for the immobilizer system-related parts.

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

(See IMMOBILIZER SYSTEM-RELATED PARTS PROGRAMMING [ADVANCED KEYLESS SYSTEM].)

No

Go to the next step.

6

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.

7

INSPECT COIL ANTENNA INPUT SIGNAL CIRCUIT

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

―  Is the resistance 10 kilohms or more?

Yes

Replace the coil antenna.

(See COIL ANTENNA REMOVAL/INSTALLATION.)

No

Repair the wiring harness.

8

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.

9

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.

10

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.

11

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 programming for the immobilizer system-related parts.

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

(See IMMOBILIZER SYSTEM-RELATED PARTS PROGRAMMING [ADVANCED KEYLESS SYSTEM].)

No

Repair the wiring harness.

SECURITY LIGHT: 11	No detected communication with the coil antenna
DTC: B1681/P1260	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 THE FUSE • Turn the ignition switch to the LOCK position. • Remove the METER 10 A fuse. • Is the fuse normal?	Yes	Go to the next step.
1		No	Replace the fuse, then go to next step.
2	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.
2		No	Repair the wiring harness.
3	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.
3		No	Repair the wiring harness.
4	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 the next step.
4		No	Go to Step 7.
5	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 programming for the immobilizer system-related parts. (See KEYLESS CONTROL MODULE REMOVAL/INSTALLATION[ADVANCED KEYLESS SYSTEM].) (See IMMOBILIZER SYSTEM-RELATED PARTS PROGRAMMING [ADVANCED KEYLESS SYSTEM].)
5		No	Go to the next step.
6	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.
6		No	Repair the wiring harness.
7	INSPECT COIL ANTENNA INPUT SIGNAL CIRCUIT • Measure the resistance between coil antenna terminal B and ground. ― Is the resistance 10 kilohms or more?	Yes	Replace the coil antenna. (See COIL ANTENNA REMOVAL/INSTALLATION.)
7		No	Repair the wiring harness.
8	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.)
8		No	Go to the next step.
9	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.)
9		No	Go to the next step.
10	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.
10		No	Repair the wiring harness.
11	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 programming for the immobilizer system-related parts. (See KEYLESS CONTROL MODULE REMOVAL/INSTALLATION[ADVANCED KEYLESS SYSTEM].) (See IMMOBILIZER SYSTEM-RELATED PARTS PROGRAMMING [ADVANCED KEYLESS SYSTEM].)
11		No	Repair the wiring harness.