DTC B257C [BCM]

id0902f5955900


R.H.D.

DTC B257C

Front (passenger-side)/rear door lock-link switch circuit open
DETECTION CONDITION
Open circuit in wiring harness between BCM and front (passenger-side)/rear door lock-link switch
POSSIBLE CAUSE
•  Open circuit in wiring harness between BCM terminal 1E and front door lock-link switch (passenger-side) terminal 2F
•  Open circuit in wiring harness between BCM terminal 6U and rear door lock-link switch (LH) terminal 2F
•  Open circuit in wiring harness between BCM terminal 6W and rear door lock-link switch (RH) terminal 2A
•  Open circuit in wiring harness between front door lock-link switch (passenger-side) terminal 2B and body ground
•  Open circuit in wiring harness between rear door lock-link switch (LH) terminal 2B and body ground
•  Open circuit in wiring harness between rear door lock-link switch (RH) terminal 2E and body ground
•  Front door lock-link switch (passenger-side) malfunction
•  Rear door lock-link switch (LH) malfunction
•  Rear door lock-link switch (RH) malfunction
•  BCM malfunction

Diagnostic procedure

STEP

INSPECTION

ACTION
1
INSPECT FRONT DOOR LOCK-LINK SWITCH (PASSEGER-SIDE) AND REAR DOOR LOCK-LINK SWITCH CONNECTOR
•  Disconnect the front door lock-link switch (passenger-side) connector.
•  Disconnect the rear door lock-link switch connector.
•  Inspect the front door lock-link switch (passenger-side) connector and rear door lock-link switch 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 FRONT DOOR LOCK-LINK SWITCH (PASSEGER-SIDE) AND REAR DOOR LOCK-LINK SWITCH SIGNAL CIRCUIT FOR OPEN
•  Inspect for continuity between the following terminals:
―  BCM terminal 1E—front door lock-link switch (passenger-side) terminal 2F (wiring harness-side)
―  BCM terminal 6U—rear door lock-link switch (LH) terminal 2F (wiring harness-side)
―  BCM terminal 6W—rear door lock-link switch (RH) terminal 2A (wiring harness-side)
•  Is there continuity?
Yes
Go to the next step.
No
Repair or replace the wiring harness for a possible open, then go to Step 6.
4
INSPECT FRONT DOOR LOCK-LINK SWITCH (PASSEGER-SIDE) AND REAR DOOR LOCK-LINK SWITCH GND CIRCUIT FOR OPEN
•  Inspect for continuity between the following terminals:
―  Front door lock-link switch (passenger-side) terminal 2B (wiring harness-side)—body ground
―  Rear door lock-link switch (LH) terminal 2B (wiring harness-side)—body ground
―  Rear door lock-link switch (RH) terminal 2E (wiring harness-side)—body ground
•  Is there continuity?
Yes
Go to the next step.
No
Repair or replace the wiring harness for a possible open, then go to Step 6.
5
INSPECT DOOR LOCK-LINK SWITCH
•  Inspect the front door lock-link switch (passenger-side) and rear door lock-link switch.
•  Is there any malfunction?
Yes
Replace the front door latch and lock actuator (passenger-side) or rear door latch and lock actuator, then go to the next step.
(See FRONT DOOR LATCH AND LOCK ACTUATOR REMOVAL/INSTALLATION.)
(See REAR DOOR LATCH AND LOCK ACTUATOR REMOVAL/INSTALLATION.)
No
Go to the next step.
6
VERIFY TROUBLESHOOTING COMPLETED
•  Make sure to reconnect all disconnected connectors.
•  Clear the DTC from the BCM memory using the M-MDS.
•  Perform the BCM DTC inspection.
•  Is the same DTC present?
Yes
Replace the BCM.
(See BODY CONTROL MODULE (BCM) REMOVAL/INSTALLATION.)
No
DTC troubleshooting completed.


L.H.D.

DTC B257C

Front (passenger-side)/rear door lock-link switch circuit open
DETECTION CONDITION
Open circuit in wiring harness between BCM and front (passenger-side)/rear door lock-link switch
POSSIBLE CAUSE
•  Open circuit in wiring harness between BCM terminal 1E and front door lock-link switch (passenger-side) terminal 2A
•  Open circuit in wiring harness between BCM terminal 6U and rear door lock-link switch (LH) terminal 2F
•  Open circuit in wiring harness between BCM terminal 6W and rear door lock-link switch (RH) terminal 2A
•  Open circuit in wiring harness between front door lock-link switch (passenger-side) terminal 2E and body ground
•  Open circuit in wiring harness between rear door lock-link switch (LH) terminal 2B and body ground
•  Open circuit in wiring harness between rear door lock-link switch (RH) terminal 2E and body ground
•  Front door lock-link switch (passenger-side) malfunction
•  Rear door lock-link switch (LH) malfunction
•  Rear door lock-link switch (RH) malfunction
•  BCM malfunction

Diagnostic procedure

STEP

INSPECTION

ACTION
1
INSPECT FRONT DOOR LOCK-LINK SWITCH (PASSEGER-SIDE) AND REAR DOOR LOCK-LINK SWITCH CONNECTOR
•  Disconnect the front door lock-link switch (passenger-side) connector.
•  Disconnect the rear door lock-link switch connector.
•  Inspect the front door lock-link switch (passenger-side) connector and rear door lock-link switch 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 FRONT DOOR LOCK-LINK SWITCH (PASSEGER-SIDE) AND REAR DOOR LOCK-LINK SWITCH SIGNAL CIRCUIT FOR OPEN
•  Inspect for continuity between the following terminals:
―  BCM terminal 1E—front door lock-link switch (passenger-side) terminal 2A (wiring harness-side)
―  BCM terminal 6U—rear door lock-link switch (LH) terminal 2F (wiring harness-side)
―  BCM terminal 6W—rear door lock-link switch (RH) terminal 2A (wiring harness-side)
•  Is there continuity?
Yes
Go to the next step.
No
Repair or replace the wiring harness for a possible open, then go to Step 6.
4
INSPECT FRONT DOOR LOCK-LINK SWITCH (PASSEGER-SIDE) AND REAR DOOR LOCK-LINK SWITCH GND CIRCUIT FOR OPEN
•  Inspect for continuity between the following terminals:
―  Front door lock-link switch (passenger-side) terminal 2E (wiring harness-side)—body ground
―  Rear door lock-link switch (LH) terminal 2B (wiring harness-side)—body ground
―  Rear door lock-link switch (RH) terminal 2E (wiring harness-side)—body ground
•  Is there continuity?
Yes
Go to the next step.
No
Repair or replace the wiring harness for a possible open, then go to Step 6.
5
INSPECT DOOR LOCK-LINK SWITCH
•  Inspect the front door lock-link switch (passenger-side) and rear door lock-link switch.
•  Is there any malfunction?
Yes
Replace the front door latch and lock actuator (passenger-side) or rear door latch and lock actuator, then go to the next step.
(See FRONT DOOR LATCH AND LOCK ACTUATOR REMOVAL/INSTALLATION.)
(See REAR DOOR LATCH AND LOCK ACTUATOR REMOVAL/INSTALLATION.)
No
Go to the next step.
6
VERIFY TROUBLESHOOTING COMPLETED
•  Make sure to reconnect all disconnected connectors.
•  Clear the DTC from the BCM memory using the M-MDS.
•  Perform the BCM DTC inspection.
•  Is the same DTC present?
Yes
Replace the BCM.
(See BODY CONTROL MODULE (BCM) REMOVAL/INSTALLATION.)
No
DTC troubleshooting completed.