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DTC B2177

id0902j0832500

DTC B2177 | Intruder sensor circuit failure
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DETECTION CONDITION | Intruder sensor malfunction or circuit malfunction
POSSIBLE CAUSE | • Open circuit in wiring harness between BCM terminal 2P and intruder sensor (front) terminal B • Open circuit in wiring harness between BCM terminal 7K and intruder sensor (rear) terminal B • Short to power supply in wiring harness between BCM terminal 2P and intruder sensor (front) terminal B • Short to power supply in wiring harness between BCM terminal 7K and intruder sensor (rear) terminal B • Short to GND in wiring harness between BCM terminal 2P and intruder sensor (rear) terminal B • Short to GND in wiring harness between BCM terminal 7K and intruder sensor (rear) terminal B • Intruder sensor malfunction • BCM malfunction

Diagnostic procedure

STEP | INSPECTION | ACTION
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1 | INSPECT INTRUDER SENSOR CONNECTOR • Turn the ignition switch off. • Disconnect the intruder sensor connector. • Inspect the intruder sensor connector terminals for poor connection (such as damaged/pulled-out pins, and corrosion). • Is there any malfunction? | Yes | Repair or replace the terminal, then go to Step 6.
No | Go to the next step.
2 | INSPECT BCM CONNECTOR • Disconnect the BCM connector. • Inspect the BCM connector terminals for poor connection (such as damaged/pulled-out pins, and corrosion). • Is there any malfunction? | Yes | Repair or replace the terminal, then go to Step 6.
No | Go to the next step.
3 | INSPECT INTRUDER SENSOR SIGNAL CIRCUIT FOR OPEN CIRCUIT • Inspect for continuity between BCM terminal 2P or 7K (wiring harness-side) and intruder sensor terminal B (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 6.
4 | INSPECT INTRUDER SENSOR SIGNAL CIRCUIT FOR SHORT TO GND • Inspect for continuity between BCM terminal 2P or 7K (wiring harness-side) and body GND. • Is there continuity? | Yes | Repair or replace the wiring harness for a possible short to GND, then go to Step 6.
No | Go to the next step.
5 | INSPECT INTRUDER SENSOR SIGNAL CIRCUIT FOR SHORT TO POWER SUPPLY • Turn the ignition switch to the ON position (Engine off). • Measure the voltage between BCM terminal 2P or 7K (wiring harness-side) and body GND. • Is the voltage B+? | Yes | Repair or replace the wiring harness for a possible short to power supply, then go to the next step.
No | Replace the intruder sensor, then go to the next step. (See INTRUDER SENSOR REMOVAL/INSTALLATION [4SD, 5HB].) (See INTRUDER SENSOR REMOVAL/INSTALLATION [WGN].)
6 | VERIFY TROUBLESHOOTING COMPLETED • Make sure to reconnect all disconnected connectors. • Clear the DTC from the BCM memory using the WDS or equivalent. • Turn the ignition switch to off then ON. • Is the same DTC present? | Yes | Replace the BCM. (See BODY CONTROL MODULE (BCM) REMOVAL/INSTALLATION.)
No | Troubleshooting completed.