DTC B1172:13 [REAR BODY CONTROL MODULE (RBCM)]


id0902p4013900

Description

Front door lock-link switch (driver's side) unlock circuit malfunction

Detection condition
•  Rear body control module (RBCM) detects an open circuit in the front door lock-link switch (driver's side) unlock circuit with the front door lock-link switch (driver's side) unlocked.
Fail-safe function
Not applicable
Possible cause
•  Front door latch and lock actuator (driver's side) connector or terminal malfunction
•  Open circuit in wiring harness between the following:
―  Front door latch and lock actuator (LH) terminal J—Body ground (L.H.D.)
―  Front door latch and lock actuator (RH) terminal D—Body ground (R.H.D.)
•  Front door lock-link switch (driver's side) malfunction
•  Rear body control module (RBCM) connector or terminal malfunction
•  Open circuit in wiring harness between the following terminals:
―  Rear body control module (RBCM) terminal 3M—Front door latch and lock actuator (LH) terminal B (L.H.D.)
―  Rear body control module (RBCM) terminal 3M—Front door latch and lock actuator (RH) terminal L (R.H.D.)
•  Rear body control module (RBCM) malfunction

Diagnostic Procedure

Step

Inspection

Action

1
VERIFY REAR BODY CONTROL MODULE (RBCM) DTCs AGAIN
•  Clear the DTC for the rear body control module (RBCM) using the M-MDS.
•  Retrieve the rear body control module (RBCM) DTCs using the M-MDS with the front door lock-link switch (driver's side) unlocked.
•  Is the same DTC displayed?
Yes
Go to the next step.
No
Go to Step 9.
2
VERIFY REAR BODY CONTROL MODULE (RBCM) DTCs AGAIN
•  Clear the DTC for the rear body control module (RBCM) using the M-MDS.
•  Retrieve the rear body control module (RBCM) DTCs using the M-MDS with the front door lock-link switch (driver's side) unlocked.
•  Is DTC B126A:11 or B126A:13 displayed?
Yes
Repair or replace the malfunctioning part according to the applicable DTC troubleshooting.
No
Go to the next step.
3
INSPECT FRONT DOOR LATCH AND LOCK ACTUATOR (DRIVER'S SIDE) CONNECTOR CONDITION
•  Switch the ignition off.
•  Disconnect the front door latch and lock actuator (driver's side) connector.
•  Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection.
•  Is the connector normal?
Yes
Go to the next step.
No
Repair or replace the connector, then go to Step 8.
4
INSPECT FOR OPEN CIRCUIT IN FRONT DOOR LOCK-LINK SWITCH (DRIVER'S SIDE) GROUND CIRCUIT
•  Verify that the front door latch and lock actuator (driver's side) connector is disconnected.
•  Inspect for continuity between the following terminal (wiring harness-side) and body ground:
―  Front door latch and lock actuator (LH) terminal J (L.H.D.)
―  Front door latch and lock actuator (RH) terminal D (R.H.D.)
•  Is there continuity?
Yes
Go to the next step.
No
Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals:
•  Front door latch and lock actuator (LH) terminal J—Body ground (L.H.D.)
•  Front door latch and lock actuator (RH) terminal D—Body ground (R.H.D.)
If there is a common connector:
•  Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit.
•  Repair or replace the malfunctioning part.
If there is no common connector:
•  Repair or replace the wiring harness which has an open circuit.
Go to Step 8.
5
INSPECT FRONT DOOR LOCK-LINK SWITCH (DRIVER'S SIDE)
•  Inspect the front door lock-link switch (driver's side).
•  Is the front door lock-link switch (driver's side) normal?
Yes
Go to the next step.
No
Replace the front door latch and lock actuator (driver's side), then go to Step 8.
6
INSPECT REAR BODY CONTROL MODULE (RBCM) CONNECTOR CONDITION
•  Disconnect the rear body control module (RBCM) connector.
•  Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection.
•  Is the connector normal?
Yes
Go to the next step.
No
Repair or replace the connector, then go to Step 8.
7
INSPECT FOR OPEN CIRCUIT IN FRONT DOOR LOCK-LINK SWITCH (DRIVER'S SIDE) UNLOCK CIRCUIT
•  Verify that the rear body control module (RBCM) and front door latch and lock actuator (driver's side) connectors are disconnected.
•  Inspect for continuity between the following terminals (wiring harness-side):
―  Rear body control module (RBCM) terminal 3M—Front door latch and lock actuator (LH) terminal B (L.H.D.)
―  Rear body control module (RBCM) terminal 3M—Front door latch and lock actuator (RH) terminal L (R.H.D.)
•  Is there continuity?
Yes
Go to the next step.
No
Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals:
•  Rear body control module (RBCM) terminal 3M—Front door latch and lock actuator (LH) terminal B (L.H.D.)
•  Rear body control module (RBCM) terminal 3M—Front door latch and lock actuator (RH) terminal L (R.H.D.)
If there is a common connector:
•  Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit.
•  Repair or replace the malfunctioning part.
If there is no common connector:
•  Repair or replace the wiring harness which has an open circuit.
Go to the next step.
8
VERIFY THAT REPAIRS HAVE BEEN COMPLETED
•  Always reconnect all disconnected connectors.
•  Clear the DTC for the rear body control module (RBCM) using the M-MDS.
•  Retrieve the rear body control module (RBCM) DTCs using the M-MDS with the front door lock-link switch (driver's side) unlocked.
•  Is the same DTC displayed?
Yes
Repeat the inspection from Step 1.
•  If the malfunction recurs, replace the rear body control module (RBCM).
Go to the next step.
No
Go to the next step.
9
VERIFY IF OTHER DTCs DISPLAYED
•  Are any other DTCs displayed?
Yes
Repair or replace the malfunctioning part according to the applicable DTC troubleshooting.
No
DTC troubleshooting completed.