SECURITY LIGHT 11, DTC B1681/P1260

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SECURITY LIGHT 11, DTC B1681/P1260

B3E090201077W06

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 • Instrument cluster 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 instrument cluster connector.
• Turn the ignition switch to the ON position.
• Measure the voltage at instrument cluster terminal 2S.

  - Is the voltage 8 V or more?

Yes

Replace the instrument cluster and perform the resetting procedure for the immobilizer system when replacing the instrument cluster.
(See INSTRUMENT CLUSTER REMOVAL/INSTALLATION.)
(See IMMOBILIZER SYSTEM COMPONENT REPLACEMENT/KEY ADDITION AND CLEARING.)

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 instrument cluster terminal 2S? | 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 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.

7

INSPECT COIL ANTENNA OUTPUT SIGNAL CIRCUIT
• Connect the coil antenna connector and the instrument cluster 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 instrument cluster connector. • Is there continuity between coil antenna terminal A and instrument cluster terminal 2Q? | Yes | Repair the wiring harness.
No | Go to the next step.

10

INSPECT COIL ANTENNA OUTPUT SIGNAL CIRCUIT
• Measure the resistance between instrument cluster terminal 2Q and ground.

  - Is the resistance 10 kilohms or more?

Yes

Replace the instrument cluster and perform the resetting procedure for the immobilizer system when replacing the instrument cluster.
(See INSTRUMENT CLUSTER REMOVAL/INSTALLATION.)
(See IMMOBILIZER SYSTEM COMPONENT REPLACEMENT/KEY ADDITION AND CLEARING.)

No | Repair the wiring harness.