DTC B109F:87 [THEFT-DETERRENT SYSTEM]

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Detection Condition

• Communication error between intruder sensor and theft-deterrent control module

Possible Causes

• Open circuit or short in wiring harness between intruder sensor and theft-deterrent control module

• Intruder sensor malfunction

• Theft-deterrent control module malfunction

System Wiring Diagram

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Diagnostic Procedure

Step

Inspection

Action

1

INSPECT INTRUDER SENSOR CONNECTOR

•  Turn the ignition switch to the LOCK position.

•  Disconnect the negative battery cable.

•  Disconnect the intruder sensor connector.

•  Inspect the intruder sensor connector. (Corrosion, damage, and disconnected pins)

•  Are the connector and terminals normal?

Yes

Go to the next step.

No

Repair/replace the intruder sensor connector or terminal.

2

INSPECT THEFT-DETERRENT CONTROL MODULE CONNECTOR

•  Disconnect the theft-deterrent control module connector.

•  Inspect the theft-deterrent control module connector. (Corrosion, damage, and disconnected pins)

•  Are the connector and terminals normal?

Yes

Go to the next step.

No

Repair/replace the theft-deterrent control module connector or terminal.

3

INSPECT WIRING HARNESS BETWEEN INTRUDER SENSOR AND THEFT-DETERRENT CONTROL MODULE

•  Inspect the wiring harness between intruder sensor connector terminal I and theft-deterrent control module connector terminal C for the following:

―  Short to body ground

―  Short to power supply

―  Open circuit

•  Is the wiring harness normal?

Yes

Go to the next step.

No

Repair or replace the wiring harness between the intruder sensor and the theft-deterrent control module.

4

INSPECT INTRUDER SENSOR

•  Reconnect the disconnected connectors.

•  Connect the negative battery cable.

•  Turn the ignition switch to the ON position.

•  Inspect the intruder sensor.
(See INTRUDER SENSOR INSPECTION.)

•  Is the intruder sensor normal?

Yes

Replace the intruder sensor, then go to the next step.

(See INTRUDER SENSOR REMOVAL/INSTALLATION.)

No

Go to the next step.

5

INSPECT DTCs

•  Clear DTCs using the M-MDS.
(See CLEARING DTC [THEFT-DETERRENT SYSTEM].)

•  Verify DTCs using the M-MDS.
(See DTC INSPECTION [THEFT-DETERRENT SYSTEM].)

•  Is DTC B109F:87 displayed again?

Yes

Replace the theft-deterrent system control module.

(See THEFT-DETERRENT CONTROL MODULE REMOVAL/INSTALLATION.)

No

DTC troubleshooting completed.

Step	Inspection		Action
1	INSPECT INTRUDER SENSOR CONNECTOR • Turn the ignition switch to the LOCK position. • Disconnect the negative battery cable. • Disconnect the intruder sensor connector. • Inspect the intruder sensor connector. (Corrosion, damage, and disconnected pins) • Are the connector and terminals normal?	Yes	Go to the next step.
1		No	Repair/replace the intruder sensor connector or terminal.
2	INSPECT THEFT-DETERRENT CONTROL MODULE CONNECTOR • Disconnect the theft-deterrent control module connector. • Inspect the theft-deterrent control module connector. (Corrosion, damage, and disconnected pins) • Are the connector and terminals normal?	Yes	Go to the next step.
2		No	Repair/replace the theft-deterrent control module connector or terminal.
3	INSPECT WIRING HARNESS BETWEEN INTRUDER SENSOR AND THEFT-DETERRENT CONTROL MODULE • Inspect the wiring harness between intruder sensor connector terminal I and theft-deterrent control module connector terminal C for the following: ― Short to body ground ― Short to power supply ― Open circuit • Is the wiring harness normal?	Yes	Go to the next step.
3		No	Repair or replace the wiring harness between the intruder sensor and the theft-deterrent control module.
4	INSPECT INTRUDER SENSOR • Reconnect the disconnected connectors. • Connect the negative battery cable. • Turn the ignition switch to the ON position. • Inspect the intruder sensor. (See INTRUDER SENSOR INSPECTION.) • Is the intruder sensor normal?	Yes	Replace the intruder sensor, then go to the next step. (See INTRUDER SENSOR REMOVAL/INSTALLATION.)
4		No	Go to the next step.
5	INSPECT DTCs • Clear DTCs using the M-MDS. (See CLEARING DTC [THEFT-DETERRENT SYSTEM].) • Verify DTCs using the M-MDS. (See DTC INSPECTION [THEFT-DETERRENT SYSTEM].) • Is DTC B109F:87 displayed again?	Yes	Replace the theft-deterrent system control module. (See THEFT-DETERRENT CONTROL MODULE REMOVAL/INSTALLATION.)
5		No	DTC troubleshooting completed.