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DTC B2721

id0902j0833300

DTC B2721 | Trunk lid/liftgate ajar output short to ground
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DETECTION CONDITION | Short to GND in wiring harness between BCM and trunk compartment light switch (4SD) or cargo compartment light switch (5HB, WGN)
POSSIBLE CAUSE | • Short to GND in wiring harness between BCM terminal 2F and trunk compartment light switch/cargo compartment light switch terminal B • Trunk compartment light switch malfunction • Cargo compartment light switch malfunction • BCM malfunction

Diagnostic procedure

STEP | INSPECTION | ACTION
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1 | INSPECT TRUNK COMPARTMENT LIGHT SWITCH CONNECTOR • Disconnect the trunk compartment light switch connector. • Inspect the trunk/cargo compartment light switch 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 5.
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 5.
No | Go to the next step.
3 | INSPECT TRUNK COMPARTMENT LIGHT SWITCH SIGNAL CIRCUIT FOR SHORT TO GND • Inspect for continuity between BCM terminal 2F (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 5.
No | Go to the next step.
4 | INSPECT TRUNK/CARGO COMPARTMENT LIGHT SWITCH • Inspect the trunk/cargo compartment light switch. (See TRUNK COMPARTMENT LIGHT SWITCH INSPECTION [4SD].) (See CARGO COMPARTMENT LIGHT SWITCH INSPECTION.) • Is there any malfunction? | Yes | Replace the trunk/cargo compartment light switch, then go to the next step. (See TRUNK LID OPENER REMOVAL/INSTALLATION.) (See LIFTGATE DISASSEMBLY/ASSEMBLY [5HB].) (See LIFTGATE DISASSEMBLY/ASSEMBLY [WGN].)
No | Go to the next step.
5 | VERIFY TROUBLESHOOTING COMPLETED • Make sure to reconnect all disconnected connectors. • Clear the DTC from the BCM memory using the WDS or equivalent. • Is the same DTC present? | Yes | Replace the BCM. (See BODY CONTROL MODULE (BCM) REMOVAL/INSTALLATION.)
No | DTC troubleshooting completed.