SECURITY LIGHT: 11, DTC B1681/P1260

id0902e4903100

SECURITY LIGHT: 11

No detected communication with the coil

DTC: B1681/P1260

DETECTION CONDITION

•  No detected communication with the coil

POSSIBLE CAUSE

•  Coil malfunction

•  Keyless unit malfunction

•  Malfunction in the related wiring harnesses

Diagnostic Procedure

STEP

INSPECTION

ACTION

1

INSPECT COIL POWER SUPPLY SYSTEM

•  Disconnect the coil connector.

•  Turn the ignition switch to the ON position.

•  Measure the voltage at coil connector 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 AND GROUND

•  Turn the ignition switch to the LOCK position.

•  Inspect the wiring harness between coil connector 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 INPUT SIGNAL CIRCUIT

•  Connect the coil connector.

•  Turn the ignition switch to the ON position.

•  Measure the voltage at coil connector terminal B.

―  Is the voltage 8 V or more?

Yes

Go to Step 7.

No

Go to the next step.

4

INSPECT COIL INPUT SIGNAL CIRCUIT

•  Turn the ignition switch to the LOCK position.

•  Disconnect the keyless unit connector.

•  Turn the ignition switch to the ON position.

•  Measure the voltage at keyless unit connector terminal 3E (without advanced keyless system)/3U (with advanced keyless system).

―  Is the voltage 8 V or more?

Yes

Replace the keyless unit and perform procedures for when replacing the keyless unit only.

(See KEYLESS UNIT REMOVAL/INSTALLATION.)

(See IMMOBILIZER SYSTEM COMPONENT REPLACEMENT/KEY ADDITION AND CLEARING.)

(See IMMOBILIZER SYSTEM COMPONENT REPLACEMENT/KEY ADDITION AND CLEARING [ADVANCED KEYLESS 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 connector terminal B and keyless unit connector terminal 3E (without advanced keyless system)/3U (with advanced keyless system)?

Yes

Go to the next step.

No

Repair the wiring harness.

6

INSPECT COIL INPUT SIGNAL CIRCUIT

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

―  Is the resistance 10 kilohms or more?

Yes

Replace the coil.

(See COIL REMOVAL/INSTALLATION.)

No

Repair the wiring harness.

7

INSPECT COIL OUTPUT SIGNAL CIRCUIT

•  Connect the coil connector and the keyless unit connector.

•  Turn the ignition switch to the ON position.

•  Measure the voltage at coil connector terminal A.

―  Is the voltage 8 V or more? (without advanced keyless system)

―  Is the voltage 5 V or more? (with advanced keyless system)

Yes

Replace the coil.

(See COIL REMOVAL/INSTALLATION.)

No

Go to the next step.

8

INSPECT COIL OUTPUT SIGNAL CIRCUIT

•  Turn the ignition switch to the LOCK position.

•  Disconnect the coil connector.

•  Turn the ignition switch to the ON position.

•  Measure the voltage at coil connector terminal A.

―  Is the voltage 8 V or more? (without advanced keyless system)

―  Is the voltage 5 V or more? (with advanced keyless system)

Yes

Replace the coil.

(See COIL 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 unit connector.

•  Is there continuity between coil connector terminal A and keyless unit connector terminal 3F (without advanced keyless system)/3V (with advanced keyless system)?

Yes

Go to the next step.

No

Repair the wiring harness.

10

INSPECT COIL OUTPUT SIGNAL CIRCUIT

•  Measure the resistance between keyless unit connector terminal 3F (without advanced keyless system)/3V (with advanced keyless system) and ground.

―  Is the resistance 10 kilohms or more?

Yes

Replace the keyless unit and perform procedures for when replacing the keyless unit only.

(See KEYLESS UNIT REMOVAL/INSTALLATION.)

(See IMMOBILIZER SYSTEM COMPONENT REPLACEMENT/KEY ADDITION AND CLEARING.)

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

No

Repair the wiring harness.

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

STEP	INSPECTION		ACTION
1	INSPECT COIL POWER SUPPLY SYSTEM • Disconnect the coil connector. • Turn the ignition switch to the ON position. • Measure the voltage at coil connector 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 AND GROUND • Turn the ignition switch to the LOCK position. • Inspect the wiring harness between coil connector 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 INPUT SIGNAL CIRCUIT • Connect the coil connector. • Turn the ignition switch to the ON position. • Measure the voltage at coil connector terminal B. ― Is the voltage 8 V or more?	Yes	Go to Step 7.
3		No	Go to the next step.
4	INSPECT COIL INPUT SIGNAL CIRCUIT • Turn the ignition switch to the LOCK position. • Disconnect the keyless unit connector. • Turn the ignition switch to the ON position. • Measure the voltage at keyless unit connector terminal 3E (without advanced keyless system)/3U (with advanced keyless system). ― Is the voltage 8 V or more?	Yes	Replace the keyless unit and perform procedures for when replacing the keyless unit only. (See KEYLESS UNIT REMOVAL/INSTALLATION.) (See IMMOBILIZER SYSTEM COMPONENT REPLACEMENT/KEY ADDITION AND CLEARING.) (See IMMOBILIZER SYSTEM COMPONENT REPLACEMENT/KEY ADDITION AND CLEARING [ADVANCED KEYLESS 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 connector terminal B and keyless unit connector terminal 3E (without advanced keyless system)/3U (with advanced keyless system)?	Yes	Go to the next step.
5		No	Repair the wiring harness.
6	INSPECT COIL INPUT SIGNAL CIRCUIT • Measure the resistance between coil connector terminal B and ground. ― Is the resistance 10 kilohms or more?	Yes	Replace the coil. (See COIL REMOVAL/INSTALLATION.)
6		No	Repair the wiring harness.
7	INSPECT COIL OUTPUT SIGNAL CIRCUIT • Connect the coil connector and the keyless unit connector. • Turn the ignition switch to the ON position. • Measure the voltage at coil connector terminal A. ― Is the voltage 8 V or more? (without advanced keyless system) ― Is the voltage 5 V or more? (with advanced keyless system)	Yes	Replace the coil. (See COIL REMOVAL/INSTALLATION.)
7		No	Go to the next step.
8	INSPECT COIL OUTPUT SIGNAL CIRCUIT • Turn the ignition switch to the LOCK position. • Disconnect the coil connector. • Turn the ignition switch to the ON position. • Measure the voltage at coil connector terminal A. ― Is the voltage 8 V or more? (without advanced keyless system) ― Is the voltage 5 V or more? (with advanced keyless system)	Yes	Replace the coil. (See COIL 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 unit connector. • Is there continuity between coil connector terminal A and keyless unit connector terminal 3F (without advanced keyless system)/3V (with advanced keyless system)?	Yes	Go to the next step.
9		No	Repair the wiring harness.
10	INSPECT COIL OUTPUT SIGNAL CIRCUIT • Measure the resistance between keyless unit connector terminal 3F (without advanced keyless system)/3V (with advanced keyless system) and ground. ― Is the resistance 10 kilohms or more?	Yes	Replace the keyless unit and perform procedures for when replacing the keyless unit only. (See KEYLESS UNIT REMOVAL/INSTALLATION.) (See IMMOBILIZER SYSTEM COMPONENT REPLACEMENT/KEY ADDITION AND CLEARING.) (See IMMOBILIZER SYSTEM COMPONENT REPLACEMENT/KEY ADDITION AND CLEARING [ADVANCED KEYLESS SYSTEM].)
10		No	Repair the wiring harness.