Home

Mazdamanuals.com

 DTC B1311

DTC B1311


id0902j0830800

DTC B1311

Unlock switch circuit open

DETECTION CONDITION

Open circuit in wiring harness between BCM and driver-side door lock-link switch (unlock signal)

POSSIBLE CAUSE

• Open circuit in wiring harness between BCM terminal 7C and door lock-link switch (driver-side) terminal E
• Front door latch and lock actuator malfunction
• BCM malfunction

Diagnostic procedure

STEP

INSPECTION

ACTION

1
INSPECT FRONT DOOR LATCH AND LOCK ACTUATOR (DRIVER-SIDE) CONNECTOR
• Turn the ignition switch off.
• Disconnect the front door latch and lock actuator (driver-side) connector.
• Inspect the front door latch and lock actuator (driver-side) 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 FRONT DOOR LATCH AND LOCK ACTUATOR (DRIVER-SIDE) SIGNAL CIRCUIT FOR OPEN CIRCUIT
• Inspect for continuity between BCM terminal 7C (wiring harness-side) and front door latch and lock actuator (driver-side) terminal E (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 5.
4
INSPECT FRONT DOOR LATCH AND LOCK ACTUATOR (DRIVER-SIDE)
• Inspect the front door latch and lock actuator (driver-side).
• Is there any malfunction?
Yes
Replace the front door latch and lock actuator (driver-side), then go to the next step.
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.
No
DTC troubleshooting completed.