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DTC B1572

id0902j0831800

DTC B1572 | Door ajar (RL/RR) circuit open
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DETECTION CONDITION | Open circuit in wiring harness between BCM and door switch (Rear, LH) Open circuit in wiring harness between BCM and door switch (Rear, RH)
POSSIBLE CAUSE | • Open circuit in wiring harness between BCM terminal 1F and door switch (Rear, LH) terminal A • Open circuit in wiring harness between BCM terminal 7D and door switch (Rear, RH) terminal A • Door switch malfunction • BCM malfunction

Diagnostic procedure

STEP | INSPECTION | ACTION
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1 | INSPECT DOOR SWITCH (LH) CONNECTOR • Turn the ignition switch off. • Disconnect the door switch (RR or RL) connector. • Inspect the door switch (RR or RL) 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 DOOR SWITCH (LH) SIGNAL CIRCUIT FOR OPEN CIRCUIT • Inspect for continuity between BCM terminal (wiring harness-side) and door switch (LH) terminal (wiring harness-side). - 1F-A (RL) - 7D-A (RR) • 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 5.
4 | INSPECT DOOR SWITCH (LH) • Inspect the door switch (RR/RL). (See DOOR SWITCH INSPECTION.) • Is there any malfunction? | Yes | Replace the door switch (RR/RL), then go to the next step. (See DOOR SWITCH REMOVAL/INSTALLATION.)
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.