DTC U0028 [BCM]SM2445902
DTC U0028 [BCM]

id0902f5950600

DTC U0028

Communication error with intruder sensor
DETECTION CONDITION
• BCM cannot receive the signal from the intruder sensor normally.
POSSIBLE CAUSE
• Intruder sensor connector or terminal malfunction
• BCM connector or terminal malfunction
• Short to ground in wiring harness between BCM terminal 5P and intruder sensor terminal C
• Short to power supply in wiring harness between BCM terminal 5P and intruder sensor terminal C
• Open circuit in wiring harness between BCM terminal 5P and intruder sensor terminal C
• Intruder sensor malfunction
• BCM malfunction

Diagnostic procedure

STEP

INSPECTION

ACTION
1
INSPECT INTRUDER SENSOR CONNECTOR CONDITION
• Turn the ignition switch to the LOCK position.
• Disconnect the negative battery cable.
• Disconnect the intruder sensor connector.
• Inspect the connector and terminals for poor connection (such as damaged/pulled-out pins, and corrosion).
• Is there any malfunction?
Yes
Repair or replace the connector and/or terminal, then go to Step 7.
No
Go to the next step.
2
INSPECT BCM CONNECTOR CONDITION
• Disconnect the BCM connector.
• Inspect the connector and terminals for poor connection (such as damaged/pulled-out pins, and corrosion).
• Is there any malfunction?
Yes
Repair or replace the connector and/or terminal, then go to Step 7.
No
Go to the next step.
3
INSPECT INTRUDER SENSOR SIGNAL CIRCUIT FOR SHORT TO GROUND
• 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 7.
No
Go to the next step.
4
INSPECT INTRUDER SENSOR SIGNAL CIRCUIT FOR SHORT TO POWER SUPPLY
• Intruder sensor and BCM connectors are disconnected.
• Reconnect the negative battery cable.
• Turn the ignition switch to the ON position.
• 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 7.
No
Go to the next step.
5
INSPECT INTRUDER SENSOR SIGNAL CIRCUIT FOR OPEN CIRCUIT
• Intruder sensor and BCM connectors are disconnected.
• Turn the ignition switch to the LOCK position.
• Disconnect the negative battery cable.
• Inspect for continuity between intruder sensor terminal C (wiring harness-side) and BCM terminal 5P (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 7.
6
VERIFY INTRUDER SENSOR MALFUNCTION
• Make sure to reconnect all disconnected connectors.
• Clear the DTC from the BCM using the M-MDS. (See CLEARING DTC [BCM].)
• Perform the BCM DTC inspection using the M-MDS. (See DTC INSPECTION [BCM].)
• Is the same DTC present?
Yes
Replace the intruder sensor, then go to the next step.
(See INTRUDER SENSOR REMOVAL/INSTALLATION [WITH INTRUDER SENSOR].)
No
DTC troubleshooting completed.
7
VERIFY TROUBLESHOOTING COMPLETED
• Make sure to reconnect all disconnected connectors.
• Clear the DTC from the BCM using the M-MDS. (See CLEARING DTC [BCM].)
• Perform the BCM DTC inspection using the M-MDS. (See DTC INSPECTION [BCM].)
• Is the same DTC present?
Yes
Replace the BCM.
(See BODY CONTROL MODULE (BCM) REMOVAL/INSTALLATION.)
No
DTC troubleshooting completed.