DTC B2574 [BCM]SM2445886
DTC B2574 [BCM]

id0902f5833100

DTC B2574

Driver-side door lock-link switch circuit (lock-side) short to ground
DETECTION CONDITION
• Short to ground in wiring harness between BCM and driver-side door lock-link switch
POSSIBLE CAUSE
• Front door latch and lock actuator (driver-side) connector or terminal malfunction
• BCM connector or terminal malfunction
• Short to ground in wiring harness between the following terminals:
― BCM terminal 5G—Front door latch and lock actuator (driver-side) terminal E (Without double locking system (L.H.D.))
― BCM terminal 5G—Front door latch and lock actuator (driver-side) terminal B (Without double locking system (R.H.D.))
― BCM terminal 5G—Front door latch and lock actuator (driver-side) terminal F (With double locking system)
• Driver-side door lock-link switch malfunction
• BCM malfunction

Diagnostic procedure

STEP

INSPECTION

ACTION
1
INSPECT FRONT DOOR LATCH AND LOCK ACTUATOR (DRIVER-SIDE) CONNECTOR CONDITION
• Turn the ignition switch to the LOCK position.
• Disconnect the negative battery cable.
• Disconnect the front door latch and lock actuator (driver-side) 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 5.
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 5.
No
Go to the next step.
3
INSPECT DRIVER-SIDE DOOR LOCK-LINK SWITCH SIGNAL CIRCUIT FOR SHORT TO GROUND
• Front door latch and lock actuator (driver-side) and BCM connectors are disconnected.
• Inspect for continuity between the following terminals (wiring harness-side) and body ground:
― Front door latch and lock actuator (driver-side) terminal E (Without double locking system (L.H.D.))
― Front door latch and lock actuator (driver-side) terminal B (Without double locking system (R.H.D.))
― Front door latch and lock actuator (driver-side) terminal F (With double locking system)
• Is there continuity?
Yes
Repair or replace the wiring harness for a possible short to ground, then go to Step 5.
No
Go to the next step.
4
INSPECT DRIVER-SIDE DOOR LOCK-LINK SWITCH
• Inspect the driver-side door lock-link switch. (See DOOR LOCK-LINK SWITCH INSPECTION.)
• Is there any malfunction ?
Yes
Replace the front door latch and lock actuator (driver-side), then go to the next step.
(See FRONT DOOR LATCH AND LOCK ACTUATOR 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 using the M-MDS. (See CLEARING DTC [BCM].)
• Perform the BCM DTC inspection using the M-MDS with the driver-side door lock-link switch unlocked. (See DTC INSPECTION [BCM].)
• Is the same DTC present?
Yes
Replace the BCM.
(See BODY CONTROL MODULE (BCM) REMOVAL/INSTALLATION.)
No
DTC troubleshooting completed.