DTC B109F:87 [BCM]

id0902f5412800

DESCRIPTION

Communication error between intruder sensor and BCM
DETECTION CONDITION
•  BCM cannot receive the signal from intruder sensor for 2.5 s or more.
POSSIBLE CAUSE
•  Intruder sensor connector or terminals malfunction
•  BCM connector or terminals malfunction
•  Short to ground in wiring harness between intruder sensor terminal C and BCM terminal 6U
•  Short to power supply in wiring harness between intruder sensor terminal C and BCM terminal 6U
•  Open circuit in wiring harness between intruder sensor terminal C and BCM terminal 6U
•  Intruder sensor malfunction
•  BCM malfunction

Diagnostic Procedure

STEP

INSPECTION

ACTION
1
CONFIRM BCM DTC
•  Clear the DTC using the M-MDS.
•  Switch the ignition to ON and wait for 2.5 s or more.
•  Perform the BCM DTC inspection using the M-MDS.
•  Is the same DTC present?
Yes
Go to the next step.
No
Go to Step 9.
2
INSPECT INTRUDER SENSOR CONNECTOR AND TERMINALS
•  Switch the ignition to off.
•  Disconnect the negative battery cable.
•  Disconnect the intruder sensor connector.
•  Inspect the connector and terminals (corrosion, damage, pin disconnection).
•  Is there any malfunction?
Yes
Repair or replace the connector or terminals, then go to Step 8.
No
Go to the next step.
3
INSPECT BCM CONNECTOR AND TERMINALS
•  Disconnect the BCM connector.
•  Inspect the connector and terminals (corrosion, damage, pin disconnection).
•  Is there any malfunction?
Yes
Repair or replace the connector or terminals, then go to Step 8.
No
Go to the next step.
4
INSPECT INTRUDER SENSOR CIRCUIT FOR SHORT TO GROUND
•  Verify that the intruder sensor and BCM connectors are disconnected.
•  Inspect for continuity between intruder sensor terminal C (wiring harness-side) and body ground.
•  Is there continuity?
Yes
Repair or replace the wiring harness for a possible short to ground, then go to Step 8.
No
Go to the next step.
5
INSPECT INTRUDER SENSOR CIRCUIT FOR SHORT TO POWER SUPPLY
•  Verify that the intruder sensor and BCM connectors are disconnected.
•  Reconnect the negative battery cable.
•  Switch the ignition to ON.
•  Measure the voltage at the intruder sensor terminal C (wiring harness-side).
•  Is there any voltage?
Yes
Repair or replace the wiring harness for a possible short to power supply, then go to Step 8.
No
Go to the next step.
6
INSPECT INTRUDER SENSOR CIRCUIT FOR OPEN CIRCUIT
•  Verify that the intruder sensor and BCM connectors are disconnected.
•  Switch the ignition to off.
•  Disconnect the negative battery cable.
•  Inspect for continuity between intruder sensor terminal C (wiring harness-side) and BCM terminal 6U (wiring harness-side).
•  Is there continuity?
Yes
Go to the next step.
No
Repair or replace the wiring harness for a possible open circuit, then go to Step 8.
7
INSPECT INTRUDER SENSOR
•  Inspect the intruder sensor.
•  Is there any malfunction?
Yes
Replace the intruder sensor, then go to the next step.
(See INTRUDER SENSOR REMOVAL/INSTALLATION.)
No
Go to the next step.
8
VERIFY TROUBLESHOOTING COMPLETED
•  Make sure to reconnect all disconnected connectors.
•  Reconnect the negative battery cable.
•  Clear the DTC using the M-MDS.
•  Switch the ignition to ON and wait for 2.5 s or more.
•  Perform the BCM DTC inspection using the M-MDS.
•  Is the same DTC present?
Yes
Repeat the inspection from Step 1.
•  If the malfunction recurs, replace the BCM.
Go to the next step.
No
Go to the next step.
9
VERIFY THAT NO OTHER DTCs ARE PRESENT
•  Are any DTCs present?
Yes
Go to the applicable DTC inspection.
(See DTC TABLE [BCM].)
No
DTC troubleshooting completed.